ORBITAL SCIENCES CORP /DE/
10-K/A, 2000-04-19
SEARCH, DETECTION, NAVAGATION, GUIDANCE, AERONAUTICAL SYS
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================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                 ---------------

                                ANNUAL REPORT ON

                                   FORM 10-K/A
                   For the fiscal year ended December 31, 1998
                         COMMISSION FILE NUMBER 0-18287

                                 ---------------

                          ORBITAL SCIENCES CORPORATION
               (Exact name of registrant as specified in charter)

              DELAWARE                                  06-1209561
      (State of Incorporation of                  (I.R.S. Employer I.D.
      Registrant)                                  No.)

                            21700 ATLANTIC BOULEVARD
                             DULLES, VIRGINIA 20166
                    (Address of principal executive offices)

                                 (703) 406-5000
                         (Registrant's telephone number)

           SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:
                                      NONE

           SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:
                          COMMON STOCK, PAR VALUE $0.01
                     (LISTED ON THE NEW YORK STOCK EXCHANGE)

                                 ---------------

    Indicate by check mark whether the registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes [X] No [ ]

    Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [ ]

    The aggregate market value of the voting stock held by non-affiliates of the
registrant based on the closing sales price as reported on the New York Stock
Exchange on March 22, 1999 was approximately $767,918,943.

    As of March 22, 1999, 37,182,819 shares of the registrant's Common Stock
were outstanding.

                       DOCUMENTS INCORPORATED BY REFERENCE

    Portions of the registrant's definitive Proxy Statement dated March 29, 1999
are incorporated by reference in Part III of this Report.
================================================================================


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                                EXPLANATORY NOTE

     Orbital Sciences Corporation ("Orbital") has determined to restate its
consolidated financial statements for the years ended December 31, 1998, 1997,
1996 and 1995 and its condensed consolidated quarterly financial statements for
1998, 1997, 1996 and 1995. This amendment includes in Item 8 such restated
financial statements for the year ended December 31, 1998, and other information
relating to such restated financial statements, including Business (Item 1),
Selected Financial Data (Item 6) and Management's Discussion and Analysis of
Financial Condition and Results of Operation (Item 7). Information regarding the
effect of the restatements on Orbital's results of operations is included in the
Notes to Financial Statements included in Item 8 of this amendment.

     Except for Items 1,6, 7 and 8 and Exhibit 27, no other information
included in the original Annual Report on Form 10-K is amended by this
Amendment. For current information regarding risks, uncertainties and other
factors that may affect Orbital's future performance, please see "Outlook:
Issues and Uncertainties" included in Item 7 of Orbital's Annual Report on Form
10-K for the year ended December 31,1999.



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<TABLE>
<CAPTION>

                                TABLE OF CONTENTS

                         ITEM                                                                        PAGE
                         ----                                                                        ----
<S>                                   <C>                                                            <C>
                                      PART I
                        ITEM 1.       Business                                                         4
                        ITEM 2.       Properties                                                      14
                        ITEM 3.       Legal Proceedings                                               14
                        ITEM 4.       Submission of Matters to a Vote of Security Holders             14
                        ITEM 4A.      Executive Officers of the Registrant                            15

                                      PART II
                        ITEM 5.       Market for Registrant's Common Equity and Related Stockholder
                                      Matters                                                         17
                        ITEM 6.       Selected Financial Data                                         17
                        ITEM 7.       Management's Discussion and Analysis of Financial Condition
                                      and Results of Operations                                       19
                        ITEM 7A.      Quantitative and Qualitative Disclosures About Market Risk      26
                        ITEM 8.       Financial Statements and Supplementary Data                     27
                        ITEM 9.       Changes in and Disagreements with Accountants on Accounting
                                      and Financial Disclosure                                        58

                                      PART III
                        ITEM 10.      Directors and Executive Officers of the Registrant              58
                        ITEM 11.      Executive Compensation                                          58
                        ITEM 12.      Security Ownership of Certain Beneficial Owners and Management  58
                        ITEM 13.      Certain Relationships and Related Transactions                  58

                                      PART IV
                        ITEM 14.      Exhibits, Financial Statement Schedules and Reports on Form
                                      8-K                                                             58
</TABLE>

- ----------

Pegasus(R) is a registered trademark and service mark of Orbital Sciences
Corporation; Taurus(R) is a registered trademark of Orbital Sciences
Corporation; Orbital(TM) is a trademark of Orbital Sciences Corporation;
OrbView(R) and ORBIMAGE(R) are registered service marks of Orbital Imaging
Corporation; and ORBCOMM(R) is a registered service mark of ORBCOMM Global L.P.


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ITEM 1.  BUSINESS

BACKGROUND

    Orbital Sciences Corporation, together with its subsidiaries, is a leading
space and information systems company that designs, manufactures, operates and
markets a broad range of space-related products and services. Our products and
services are grouped into three general business sectors: space and ground
infrastructure systems, satellite access products and satellite services. Space
and ground infrastructure systems include launch vehicles, satellites and
related space systems, electronics and sensor systems, and satellite ground
systems and software. Satellite access products include satellite-based
navigation, positioning and communications products and transportation
management systems. Satellite services include satellite-based two-way mobile
data communications services, satellite-based remote imaging services, and new
initiatives relating to satellite-based automotive information services and
satellite-based voice communications services.

    Orbital was incorporated in Delaware in 1987 to consolidate the assets,
liabilities and operations of Space Systems Corporation and Orbital Research
Partners, L.P. Since inception, it has been our strategy to develop and grow a
core integrated business of space systems technologies and products, starting
with the design and manufacturing of small satellites and lightweight rockets
and other inexpensive space systems intended to capitalize on the commercial
development of space. A major part of this strategy has centered on
market-expanding innovations that we have pioneered. For example, in 1990, we
introduced the world's first privately-developed space launch vehicle; in 1992,
we operated the first commercial orbit transfer vehicle; in 1995, we launched
the first operational low-orbit commercial communications satellites; in 1997,
we deployed the first small geosynchronous television broadcast satellite and
also launched the first privately-owned remote imaging satellite; and in 1998,
we shipped the first hand-held satellite communications device.

    In the last ten years, we have also expanded our space-based product lines
through a number of acquisitions and strategic investments. For example, in 1994
and 1997, we acquired Fairchild Space and Defense Corporation and the space
systems and communications service businesses of CTA Incorporated ("CTA"),
respectively, broadening our satellite system and subsystem development and
production capabilities and expanding our product lines by adding various
sophisticated electronics products and transportation management systems. We
further enhanced our transportation management systems product line with the
1998 acquisition of Raytheon Company's transportation management systems
business. Through our 1994 acquisition of Magellan Corporation ("Magellan"), we
expanded our technology base and product lines into the consumer markets for
hand-held receivers for Global Positioning System, or GPS, satellite-based
navigation and positioning. We expanded our GPS business with the 1997
acquisition of the satellite-aided automotive navigation product line from
Rockwell International Corporation and the 1997 merger of Magellan with Ashtech
Inc. ("Ashtech"), a developer and supplier of high-precision GPS products,
components and technologies. In 1995, we acquired MacDonald, Dettwiler and
Associates Ltd. ("MDA"), a leading supplier of commercial satellite imaging
ground stations and related information processing software based in Vancouver,
British Columbia.

    In 1990, we developed the "ORBCOMM" concept and in 1993, our subsidiary,
Orbital Communications Corporation ("OCC"), and Teleglobe Mobile Partners
("Teleglobe Mobile"), an affiliate of Teleglobe Inc., formed ORBCOMM Global,
L.P. ("ORBCOMM") for the design, development, construction, integration, testing
and operation of a low-Earth orbit satellite communications system known as the
ORBCOMM System. OCC and Teleglobe Mobile are each 50% general partners in
ORBCOMM. Additionally, OCC is a 2% partner in ORBCOMM USA, L.P. ("ORBCOMM USA")
and Teleglobe Mobile is a 2% general partner in ORBCOMM International Partners,
L.P. ("ORBCOMM International"), two partnerships formed to market the ORBCOMM
System. ORBCOMM is a 98% general partner in each of the two marketing
partnerships. We control and, therefore, consolidate ORBCOMM USA's results of
operations. We do not control ORBCOMM's or ORBCOMM International's operational
or financial affairs and therefore do not consolidate their results of
operations.

    In 1992, we established a subsidiary, Orbital Imaging Corporation
("ORBIMAGE"), to develop and operate commercial remote imaging satellites and to
market the products and services derived from such satellites. ORBIMAGE raised
equity in private placements of preferred stock in 1997 and 1998, and as a
result we own approximately 100% of ORBIMAGE's outstanding common stock and
approximately 60% of the total voting interest in ORBIMAGE (after giving effect
to the conversion of ORBIMAGE's outstanding convertible preferred stock. Based
on certain rights granted to the preferred equity investors, we do not control
ORBIMAGE's operational or financial affairs and therefore do not consolidate its
results of operations.



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    We have also begun to pursue additional satellite-based services
opportunities. In early 1999, we formed a subsidiary, Orbital Navigation
Corporation ("ORBNAV"), to develop, operate and market, directly or through
joint ventures, satellite-aided automotive guidance and related value-added
information services for the rental car, private passenger car, commercial
delivery vehicle and emergency vehicle markets. ORBNAV plans to leverage
Magellan's satellite access products, ORBCOMM's satellite data network and other
technologies to pursue growth opportunities in these markets. ORBNAV's current
focus is on developing the rental car market through a joint venture with The
Hertz Corporation. In 1998, we also made a strategic investment in CCI
International N.V. ("CCI"), a company formed to offer satellite-based voice
communications services. We own approximately 40% of the equity interests in CCI
in the form of nonvoting preferred stock with various protective provisions, and
we have entered into a contract for the construction and launch of CCI's
satellites. We do not control CCI's operational or financial affairs and
therefore do not consolidate its results of operations.

DESCRIPTION OF ORBITAL'S PRODUCTS AND SERVICES

    Our products and services are grouped into three general business sectors:
space and ground infrastructure systems, satellite access products and satellite
services. Our overall business is not seasonal to any significant extent.

SPACE AND GROUND INFRASTRUCTURE SYSTEMS

    Our space and ground infrastructure systems sector currently includes launch
vehicles, satellites and related space systems, electronics and sensor systems,
and satellite ground systems and software products, and is described more fully
below.

    Launch Vehicles. We developed and produce the Pegasus and Taurus space
launch vehicles that place small satellites into Earth orbit. Our Pegasus launch
vehicle is launched from beneath our L-1011 carrier aircraft to deploy
satellites weighing up to 1,000 pounds into low-Earth orbit. The Taurus launch
vehicle is a ground-launched derivative of the Pegasus vehicle that can carry
payloads weighing up to 3,000 pounds to low-Earth orbit and payloads weighing up
to 800 pounds to geosynchronous orbit.

    The Pegasus has performed a total of 26 missions, including six successful
launches in 1998 and one successful mission so far in 1999. The Taurus has
performed a total of three launches, including two successful missions in 1998.
Customers for Pegasus launch services currently include the National Aeronautics
and Space Administration ("NASA"), the U.S. Air Force, the Defense Advanced
Research Projects Agency ("DARPA"), ORBCOMM and ORBIMAGE. Customers for Taurus
missions currently include the U.S. Air Force, South Korea's space agency and
ORBIMAGE.

    Under a research and development contract with NASA, we are designing and
constructing three X-34 unmanned reusable launch vehicles that will be launched
from our L-1011 carrier aircraft. The X-34 will test and demonstrate advanced
reusable launch system technologies and materials as part of NASA's program that
is focused on the development of next-generation, lower cost launch vehicles. We
have completed the detailed design of the X-34, have constructed and shipped one
vehicle to the launch test site and are constructing two other vehicles. The
first test flight of the X-34 is currently scheduled for later in 1999. NASA has
contracted with us to conduct up to 27 test flights using the X-34.

    We also produce suborbital launch vehicles, which place payloads into a
variety of high-altitude trajectories but, unlike space launch vehicles, do not
place payloads into orbit around the Earth. Our suborbital launch products
include suborbital vehicles and their principal subsystems, payloads carried by
such vehicles, and related launch support installations and systems used in
their assembly and operation. Customers typically use our suborbital launch
vehicles to launch scientific and other payloads and for defense-related
applications such as target signature and interceptor experiments. Our primary
customers for suborbital launch vehicles include various branches of the U.S.
military. We conducted three successful suborbital launches in 1998 and, since
1982, we (including a predecessor company) have performed 102 suborbital
missions.

    Orbital's space launch technology is also the basis for several other space
and suborbital programs. We are currently performing work under a suborbital
contract with the U.S. Air Force to combine surplus government


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ballistic missile equipment with Pegasus and Taurus launch vehicle technology to
conduct up to 24 space and suborbital launch missions over the next several
years. In addition, under NASA's Hyper-X project, we are building several
Pegasus-derivative rockets to explore technologies that could be applied to
hypersonic aircraft of the future.

    Satellites and Related Space Systems. We design and manufacture small and
medium-class satellites to be used in low-Earth orbit, or LEO, and in
geosynchronous orbit, or GEO. In addition, we are in the process of designing
small and medium-class satellites to be used in medium-Earth orbit, or MEO. Our
satellites are used by various commercial and governmental customers for a wide
range of communications, broadcasting, remote imaging, scientific and military
missions. Since 1982, we (including two predecessor companies) have built and
delivered 74 satellites.

    Twenty Orbital-built satellites were deployed during 1998, including 18
ORBCOMM communications satellites. Customers for our LEO and MEO satellites
include NASA, the U.S. Air Force, DARPA, the Canadian Space Agency, ORBCOMM,
ORBIMAGE and CCI, while Japan's Broadcast Satellite Systems Corporation has
ordered two GEO direct-to-home broadcast satellites from Orbital.

    We design and manufacture various other space systems, including satellite
command and data handling, attitude control and structural subsystems for a
variety of government and commercial customers. In addition, we provide a broad
range of spacecraft design and engineering services as well as specialized
space-related analytical engineering services for U.S. government agencies,
including NASA, the Jet Propulsion Laboratory, the Department of Defense ("DoD")
and the Department of Energy.

    Electronics and Sensor Systems. Orbital develops and manufactures defense
electronics products, including advanced avionics and data management systems
for aircraft flight operations and ground support applications. These systems
collect, process and store mission-critical data for, among other things,
mission planning and flight operations, and manage on-board equipment for
aircraft and similar platforms. The primary customers for data management
systems are the U.S. Navy, the U.S. Air Force, and various DoD prime contractors
and foreign governments. We are the leading supplier of certain avionics systems
and products, including mission data equipment for the U.S. Navy and data
transfer equipment and digital terrain systems for the U.S. Air Force and
foreign military customers. In addition, we provide stores management systems,
including weapons arming and firing functions for use on tactical aircraft and
helicopters. The avionics systems and products are deployed on a number of
platforms, including the F-4, F-14, F-16, F-18 and F-22 aircraft and the LAMPS
helicopter. The U.S. Army is also a customer for land combat vehicle-based
systems that are derived from Orbital's avionics systems.

    Orbital also produces satellite-borne scientific sensors and instruments,
such as atmospheric ozone monitoring instruments and environmental sensors. For
example, our instruments have successfully operated in space, measuring ozone
concentrations around the world. We also developed and produced an atmospheric
monitoring system for use on the International Space Station. We provide sensors
performing similar functions for U.S. Navy nuclear submarines, and we are
developing sensors for the DoD for use in the detection of chemical or
biological weapons. In addition, Orbital manufactures and markets sensors that
analyze gas properties for commercial customers in the chemical, biotechnology,
pharmaceutical and steel industries.

    Satellite Ground Systems and Software. Through our MDA subsidiary, we are
the leading supplier of turn-key commercial imaging satellite ground stations
and a provider of advanced image processing software used in such stations. In
recent years, our ground systems have also expanded to include
software-intensive products designed for air and sea navigation systems, along
with a variety of military applications including naval mine-hunting operations,
artillery command and control, radar deception and logistics support.

    Of approximately 45 major non-military imaging satellite ground stations
around the world, Orbital has been the prime contractor or a major supplier in
the construction of 35 ground stations in 19 countries. These ground stations
are designed to receive and process data from the eight major civil and
commercial Earth observation satellites currently in operation. Orbital also
develops and markets software that generates and processes imagery from
satellites and airborne sensors. Customers for our ground stations and Earth
information systems and system upgrades include the European and Canadian space
agencies as well as ORBIMAGE, EarthWatch, Incorporated and various other
commercial and government customers in the United States, Brazil, China, Europe
and Japan.


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    We also produce automated aeronautical information and air traffic control
systems. Faster and less expensive to operate than traditional manual systems,
automated aeronautical information systems provide pilots and other users with
aeronautical and meteorological information on a timely basis. Customers for our
aeronautical systems products include the military and civil aviation
authorities in various countries such as Australia, Belgium, Canada, Malaysia,
Norway and Switzerland.

    We are building on our expertise in satellite image processing software by
expanding into land-oriented information systems. In 1998, the British Columbia
government selected MDA to operate and enhance the province's electronic
information access system, which provides the public with electronic access to a
series of land-related government databases, such as land titles, tax records
and property assessment information.

SATELLITE ACCESS PRODUCTS

    Our satellite access products include the satellite-based navigation,
positioning and communications products of our Magellan subsidiary, as well as
transportation management systems, as described more fully below.

    GPS Navigation, Positioning and Communications Products. Magellan's product
line consists of inexpensive satellite-based navigation and positioning products
for consumer markets as well as GPS products that are used for professional and
other high-precision industrial applications. Its consumer products are marketed
to recreational marine and general aviation customers and outdoor recreation
users such as campers, hunters and hikers. In 1998, Magellan introduced the GSC
100, a hand-held satellite communications device that combines GPS and
communications functions. The GSC 100 represents the first generation of
Magellan products that will be used in conjunction with the ORBCOMM System
described below.

    Professional and industrial applications include using GPS for precision
surveying, guiding aircraft under low-visibility conditions, monitoring
movements of the Earth's surface for researchers, and managing natural
resources. In addition, some of Magellan's higher-performance products
incorporate technology that provides access to both the U.S. GPS satellites and
GLONASS, the comparable Russian satellite navigation system, which improves
performance and accuracy.

    Magellan has also entered the market for GPS-based car navigation products
with its automotive navigation system, which uses GPS information to provide
electronic map guidance to individual motorists. Magellan's automotive
navigation system is currently in use in approximately 6,000 Hertz rental cars.
Magellan recently introduced its second-generation vehicle navigation system,
which has greater functionality and improved features to address broader private
passenger vehicle and rental car markets. As one of the first opportunities we
are pursuing through our ORBNAV initiative, we have agreed with Hertz to enter
into an exclusive joint venture, subject to negotiation of final documentation,
whereby Hertz will offer Magellan's new automotive navigation systems in 50,000
of its rental cars in the U.S., Canada and Europe.

    Magellan also pursues technology license agreements whereby Magellan
licenses its GPS and GLONASS technology to manufacturers of GPS consumer and
industrial products. Magellan has entered into such license arrangements with a
Mitsubishi subsidiary, Philips Semiconductor and Matsushita Electric Works.

    In the first quarter of 1999, Magellan and Japan-based Topcon Corporation
entered into a preliminary agreement to form a joint venture to develop and sell
GPS-based positioning products for the surveying, industrial geographic
information systems, mapping and machine control markets. Under the terms of the
agreement, which is subject to negotiation of final documentation, Magellan will
transfer certain assets and technology in exchange for cash, royalties, rights
in technology and a 30% ownership interest. Topcon also will contribute assets
to the venture in exchange for a 70% ownership interest.

    In connection with the 1997 merger of Ashtech with Magellan, Orbital entered
into a stockholders' agreement with certain substantial stockholders of Ashtech.
The Ashtech stockholders were granted certain rights with respect to Magellan,
including, among others, the right to designate two members of Magellan's
seven-member board of directors and to demand registration of their Magellan
common stock after the earlier of 180 days after an initial public offering of
the common stock of Magellan or December 31, 1999. Orbital and former Ashtech
stockholders own approximately 66% and 34%, respectively, of Magellan.


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    Transportation Management Systems. Orbital also produces satellite-related
vehicle location and fleet management systems that have been used primarily for
metropolitan mass transit operators. Our ORBTRAC transportation management
systems combine GPS vehicle tracking technology with local area wireless
terrestrial communications to help manage public bus and light rail systems,
provide for voice and data communications and transmit precise GPS-based
location information in emergency situations. The 1998 acquisition of Raytheon
Company's transportation management systems business expanded our
satellite-based vehicle location products to include fleet management software
for utilities and other companies. Customers for our transportation management
systems include the metropolitan mass transit authorities in Chicago, New York,
Oakland, Philadelphia, Houston and Detroit, as well as a number of smaller state
and municipal transit systems and vehicle fleets.

SATELLITE SERVICES

    In Orbital's satellite services sector, our ORBCOMM and ORBIMAGE affiliates
are developing and providing satellite-based services to address markets for
global two-way data communications and digital imagery of the Earth's surface.
We have also begun to pursue additional satellite-provided services
opportunities in the markets for automotive information services through ORBNAV.
As a result of our equity investment in CCI, our satellite services sector also
includes the development of a satellite-based voice communications system.

    ORBCOMM Communications Services. The ORBCOMM System consists of global space
and ground segments designed to provide continuous low-cost monitoring, tracking
and messaging communications coverage over most of the Earth's surface. ORBCOMM
is currently providing commercial service primarily in the monitoring and
tracking applications. The system is intended to be a reliable, cost-effective
method of providing fixed asset monitoring, mobile asset tracking and data
messaging services to a broad range of industrial and commercial customers
around the world, enabling customers to collect data from multiple locations,
track assets on a global basis and transmit and receive messages outside the
coverage area of terrestrial services. It is designed to permit subscribers to
use inexpensive communicators to send and receive short messages, high-priority
alerts and other information, such as the location and condition of automobiles,
trucks, railcars, industrial equipment, shipping vessels and other remote or
mobile assets. We expect that the ability to send and receive data and messages
without the geographic limitations of existing terrestrial communications
systems will stimulate the growth of new markets for satellite-based monitoring,
tracking and messaging communications and will be used to supplement
terrestrial-based communications systems by providing relatively low-cost wide
area geographic coverage in areas those systems are unable to reach.

    The ORBCOMM System initial network consists of a constellation of 28 small
LEO satellites, with a satellite control center that operates and positions the
satellites, fixed and mobile communicators used by subscribers to transmit
messages to and receive messages from the satellites, and regional ground
gateway systems that transmit and control the flow of data and message
communications and other information for the system. A gateway generally
consists of a satellite tracking station that sends signals to and receives
signals from the satellites and a message switching system that processes the
message traffic.

    There are currently four operational U.S. gateway stations located in New
York, Washington, Arizona and Georgia. Gateways are also planned to be owned and
operated by ORBCOMM licensees in strategic locations around the world. These
licensees are responsible for obtaining the necessary regulatory approvals for
operating the ORBCOMM System in their regions. Gateways located in Italy,
Brazil, and Japan, providing coverage for significant portions of Europe and
South America and all of Japan, have successfully completed acceptance testing.
ORBCOMM's international licensees in Italy and Brazil commenced commercial
service for their respective regions in early 1999, and Japan is expected to
commence commercial service shortly. ORBCOMM has agreements with several
manufacturers for the development and manufacture of hand-held communicators
used by individuals and various types of industrial communicators that monitor
fixed and mobile assets. Subscriber communicator manufacturers include
Panasonic, Magellan and Scientific Atlanta.

    Orbital is completing construction of ORBCOMM's equatorial plane of seven
satellites, scheduled for launch on a Pegasus vehicle later in 1999. Orbital and
ORBCOMM have also entered into a procurement agreement valued at up to $72
million, under which Orbital has agreed to build and launch an additional seven
satellites on a fixed-price basis, with options to build and launch up to an
additional 22 satellites. Orbital also provides ORBCOMM with


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certain administrative services, generally on a cost-reimbursable basis.

    Orbital developed the "ORBCOMM" concept in 1990, and in 1993 formed the
ORBCOMM partnership with Teleglobe Mobile for the design, development,
construction, integration, testing and operation of the ORBCOMM System. OCC and
Teleglobe Mobile each hold a 50% interest in ORBCOMM and have invested
approximately $110,000,000 and $118,000,000, respectively, through December 31,
1998. OCC and Teleglobe Mobile also formed two marketing partnerships, ORBCOMM
USA and ORBCOMM International, each with the exclusive right to market the
ORBCOMM System in the U.S. and internationally, respectively.

    Pursuant to the terms of the partnership agreements, OCC indirectly holds a
51% interest in ORBCOMM USA, with the result that OCC acting alone can generally
control the operational and financial affairs of ORBCOMM USA, and Teleglobe
Mobile indirectly holds a 51% interest in ORBCOMM International, with the result
that Teleglobe Mobile acting alone can generally control the operational and
financial affairs of ORBCOMM International. Since OCC is unable to control, but
is able to exercise significant influence over, ORBCOMM's and ORBCOMM
International's operational and financial affairs, we account for our
investments in ORBCOMM and ORBCOMM International using the equity method of
accounting. Since OCC is able to control the operational and financial affairs
of ORBCOMM USA, we consolidate ORBCOMM USA's results of operations.

    In accordance with the equity method of accounting, we recognize 100% of the
revenues earned and costs incurred on sales of products and services to ORBCOMM.
We also recognize as equity in earnings (losses) of affiliates our proportionate
share of ORBCOMM's profits and losses based on our percentage of partnership
interest. To the extent ORBCOMM capitalizes its purchases from Orbital, we
eliminate as equity in earnings (losses) of affiliates approximately 50%, our
current equity ownership in ORBCOMM, of our profits from sales to ORBCOMM.

    We believe that ORBCOMM will require significant additional funding in 1999.
Orbital and ORBCOMM are currently in the process of exploring financing
alternatives to fund future capital expenditures and to fund ORBCOMM's
operations costs. Such alternatives include, but are not limited to, additional
capital contributions from ORBCOMM's existing partners or other strategic
investors, vendor financing, deferred invoicing, equity or debt transactions and
other strategic alternatives. There can be no assurance that any financing will
be completed or available on terms commercially acceptable to ORBCOMM. During
1998, Orbital deferred invoicing ORBCOMM for approximately $33,000,000 of work
performed under our ORBCOMM satellite and launch procurement agreement. During
1999, we may defer up to $25,000,000 of invoicing for work performed for
ORBCOMM. One-half of the deferred invoice amounts has been, and is expected to
continue to be, advanced to Orbital by an affiliate of Teleglobe Inc.

    Orbital anticipates that start-up of the ORBCOMM System will continue to
produce substantial operating losses through 1999. There can be no assurance
that an adequate market will develop for ORBCOMM services, that ORBCOMM will
achieve profitable operations or that we will recover any of our past or
anticipated investment in ORBCOMM.

    ORBIMAGE Imagery Services. ORBIMAGE operates, and is further developing, a
fleet of satellites that collect, process and distribute digital imagery of the
Earth's surface, the atmosphere and weather conditions. ORBIMAGE's imaging
products and services are designed to provide customers with timely and
competitively priced information concerning, among other things, the location
and movement of military assets, urban growth, forestry and crop health, land
and ocean-based natural resources and weather patterns and wind conditions.

    In April 1995, ORBIMAGE launched its first satellite, OrbView-1, which
provides to NASA dedicated weather-related imagery and meteorological products.
ORBIMAGE's second satellite, OrbView-2 (operated under a licensing agreement
with Orbital), commenced commercial service in 1997 and is used by ORBIMAGE to
deliver high-quality multi-spectral ocean imagery and land surface imagery to
government and commercial customers. ORBIMAGE expects to launch two additional
satellites, OrbView-3 and OrbView-4, in 1999 and 2000, respectively. We believe
that OrbView-3 and OrbView-4 will be among the first commercial satellites with
high-resolution imagery capability and that OrbView-4 will be the world's first
satellite with commercially available hyperspectral imaging capability. As of
December 31, 1998, ORBIMAGE and MDA entered into a license agreement whereby
ORBIMAGE agreed to acquire from MDA the exclusive worldwide rights to distribute
and sell radar imagery from the RadarSat-2 satellite that is expected to be
operational in 2002. Orbital is constructing the


                                       9
<PAGE>   10


RadarSat-2 satellite and ground system, which are being financed by the Canadian
Space Agency, the anchor customer for RadarSat-2 imagery.

    Under the procurement agreement between Orbital and ORBIMAGE, Orbital is
producing and launching the OrbView-3 and OrbView-4 satellites, and is
constructing the related ground segment on a fixed-price basis. Orbital also
provides ORBIMAGE with administrative services and technical support, generally
on a cost-reimbursable basis.

    In February 1998, ORBIMAGE completed a private financing of $150,000,000
units consisting of 11 5/8% Senior Notes due 2005 and warrants to purchase an
aggregate of approximately 3% of ORBIMAGE's outstanding common stock.
Concurrently, the existing preferred stockholders of ORBIMAGE exercised an
option to purchase additional preferred stock of ORBIMAGE, resulting in
additional net proceeds to ORBIMAGE of approximately $21,000,000. The preferred
stockholders have certain demand registration rights with respect to their
shares after June 30, 2002.

    We own approximately 100% of ORBIMAGE's outstanding common stock and
approximately 60% of the total voting interest in ORBIMAGE (after giving effect
to the conversion of ORBIMAGE's convertible preferred stock, with the remainder
owned primarily by the preferred stockholders. As a result of certain rights
granted to the preferred stockholders, including the right to elect certain
directors and have such directors participate in significant management
decisions, we do not control the operational and financial affairs of ORBIMAGE.
In accordance with the equity method of accounting, we recognize 100% of the
revenues earned and costs incurred on sales of products and services to
ORBIMAGE. We also recognize as equity in earnings (losses) of affiliates our
proportionate share (based on our current common equity ownership) of ORBIMAGE's
net income available to common stockholders. To the extent ORBIMAGE capitalizes
its purchases from Orbital, we eliminate as equity in earnings (losses) of
affiliates our proportionate share (based on our current common equity
ownership) of profits from sales to ORBIMAGE.

    As of December 31, 1998, we had invested approximately $27,891,000 in
ORBIMAGE. We anticipate that ORBIMAGE will incur operating losses at least
through 1999. There can be no assurance that an adequate market will develop for
ORBIMAGE's products and services, that it will achieve profitable operations or
that we will recover our investment in ORBIMAGE.

    ORBNAV Automotive Information Services. We established ORBNAV in early 1999
to develop, operate and market, directly or through joint ventures,
satellite-aided automotive guidance and related value-added information services
for the rental car, private passenger car, commercial delivery vehicle and
emergency vehicle markets. ORBNAV's initial focus is on developing the rental
car market through an exclusive joint venture for which final documentation is
currently under negotiation with Hertz, which venture will initially purchase
50,000 Magellan automotive navigation systems for installation in Hertz rental
cars. Through ORBNAV, Orbital intends to invest up to $30,000,000 in exchange
for a 60% interest, while Hertz intends to invest up to $20,000,000 and provide
initial marketing services in exchange for a 40% interest in the joint venture.

    CCI Voice Communications. In 1998, we made a strategic investment in CCI.
CCI was formed to develop, construct and operate a constellation of satellites
offering satellite-based voice communications services in the world's equatorial
regions. Pursuant to the terms of our stock purchase agreement, we have agreed,
subject to the satisfaction by CCI of various operational and financial
milestones, to purchase up to $50,000,000 of CCI's nonvoting convertible
preferred shares, and we have an option to purchase an additional $50,000,000 of
such preferred shares. In connection with the stock purchase transaction, we
also entered into a satellite and launch vehicle procurement contract valued at
approximately $480,000,000 for the satellites (and a price to be determined for
the launch vehicles in the event we procure them). We have also agreed, subject
to satisfaction of various conditions, to provide vendor financing.

    We own approximately 40% of CCI, with the remainder owned by outside
investors. Our preferred shares in CCI are nonvoting, but pursuant to the terms
of such shares, we have approval rights with respect to significant management
decisions. Our approval rights may become diluted to the extent additional
investors in CCI purchase preferred shares with similar terms. Though we do not
control CCI, we are able to exercise significant influence over CCI's
operational and financial affairs, and we currently account for our investment
in CCI using a modified equity method of accounting. In accordance with the
modified equity method of accounting, we recognize 100% of CCI's losses. As we
have provided substantially all of the CCI's funding, we do not recognize
revenues on sales to CCI. As of December 31, 1998, we had purchased $22,000,000
of the preferred shares and had not


                                       10
<PAGE>   11

provided any vendor financing. There can be no assurance that CCI will achieve
its financial or operational milestones, some of which entail raising additional
capital, or that an adequate market will develop for CCI's products and
services, and we may be required to write off all, or a portion, of our
investment.

RECENT DEVELOPMENTS

    On March 12, 1999, Orbital and Magellan signed a merger agreement with
Lowrance Electronics, Inc., a leading manufacturer of marine and recreational
electronics using GPS-satellite navigation and sonar technology. Under the terms
of the merger, Orbital will acquire all the outstanding common stock of Lowrance
and Lowrance shareholders will receive between 745,000 and 1,250,000 shares of
Orbital common stock, based on the fair market value of Orbital common stock
prior to closing. Lowrance will be merged into Magellan at the closing and
Orbital's ownership of Magellan following the merger will increase to
approximately 85%. We expect the transaction to close in the second half of
1999. Closing is subject to regulatory approval and Lowrance shareholder
approval.

    On March 18, 1999, MDA and Toronto-based Spar Aerospace Limited signed an
asset purchase agreement pursuant to which MDA will acquire Spar's space
robotics division for approximately $43,000,000 in cash, one-half of which is
payable upon closing, with the other half payable a year following closing. The
Spar acquisition will expand our product lines to include advanced robotics
primarily for the manned space market. We expect the transaction to close in the
second quarter of 1999, subject to customary closing conditions.

COMPETITION

    Orbital believes that competition for sales of its products and services is
based on performance and other technical features, price, reliability,
scheduling and customization.

    The primary domestic competition for the Pegasus and Taurus launch vehicles
comes from the Athena launch vehicles developed by Lockheed Martin Corporation.
In addition, Pegasus may face competition from launch systems derived from U.S.
government surplus ballistic missiles. The Israeli Shavit vehicle and other
potential foreign launch vehicles could also pose competitive challenges to
Pegasus, although U.S. government policy currently prohibits the launch of
foreign vehicles from U.S. territory. Competition for Taurus could come from
surplus Titan II launch vehicles, although a very limited inventory remains, and
from the Russian Kosmos SL-8 launch vehicle. Competition to Pegasus and Taurus
vehicles also exists in the form of partial or secondary payload capacity on
larger boosters including the Ariane, Atlas and Delta launch vehicles. Our
primary competitors in the suborbital launch vehicle product line are Coleman
Research Corporation, Lockheed Martin and Space Vector Corporation.

    Our satellites and satellite subsystems products compete with products and
services produced or provided by government entities and numerous private
entities, including TRW Inc., Ball Aerospace and Technology Corporation,
Lockheed Martin, GM Hughes Electronics Corporation and Spectrum Astro, Inc. Our
airborne and ground-based electronics, data management systems, defense-oriented
avionics products and software systems, aviation systems and space sensors and
instruments face competition from several established manufacturers, including
Smiths Industries, Lockheed Sanders and Honeywell Inc. Our main competitors in
the area of satellite ground stations include Datron Systems Inc., Matra Marconi
Space N.V. and Hughes-STX Corp. Our satellite access products primarily face
competition from Trimble Navigation Ltd., Garmin International, Philips
Automotive Electonics, Alpine Electronics and Clarion. The main competitors to
our transportation management systems are Rockwell and Harris Corporation.

    ORBCOMM may face competition from numerous existing and proposed
satellite-based and terrestrial systems providing data communications services.
ORBIMAGE may face competition from U.S. and foreign governmental entities and
private entities, including Space Imaging EOSAT and EarthWatch, that provide or
are seeking to provide satellite-based imagery products.

    Many of our competitors are larger and have substantially greater resources
than we do. Furthermore, the possibility exists that other domestic or foreign
companies or governments, some with greater experience in the space industry and
greater financial resources than Orbital, will seek to produce products or
services that compete with our products or services. Any such foreign competitor
could benefit from subsidies from or other protective


                                       11
<PAGE>   12


measures by its home country.

RESEARCH AND DEVELOPMENT

    We expect to continue to invest in product-related research and development,
to conceive and develop new products and services, to enhance existing products
and services and to seek customer and, where appropriate, third-party strategic
investments in these products and services. Our research and development
expenses, excluding direct customer-funded development, were approximately
$49,384,000, $33,140,000 and $23,068,000, respectively, for the fiscal years
ended December 31, 1998, 1997 and 1996.

PATENTS AND TRADEMARKS

    We rely, in part, on patents, trade secrets and know-how to develop and
maintain our competitive position and technological advantage. We hold and have
applications pending for various U.S. and foreign patents relating to the
Pegasus vehicle, our satellites, certain of our GPS products, and other systems
and products. Certain of the trademarks and service marks used in connection
with our products and services have been registered with the U.S. Patent and
Trademark Office, the Canadian Intellectual Property Office and certain other
foreign trademark authorities.

COMPONENTS, RAW MATERIALS AND CARRIER AIRCRAFT

    We purchase a significant percentage of our product components, including
rocket propulsion motors, structural assemblies, electronic equipment and
computer chips, from third parties. We also occasionally obtain from the U.S.
government parts and equipment that are used in the production of our products
or in the provision of our services. We have not experienced material difficulty
in obtaining product components or necessary parts and equipment and we believe
that alternative sources of supply would be available, although increased costs
and possible delays could be incurred in securing alternative sources of supply.
Our ability to launch our Pegasus vehicle depends on the availability of an
aircraft with the capability of carrying and launching such space launch
vehicle. We own the modified Lockheed L-1011 carrier aircraft that is used for
the Pegasus vehicle and will be used for the X-34 advanced launch vehicle. In
the event that the L-1011 carrier aircraft were to be unavailable, we would
experience significant delays, expenses and loss of revenues as a result of
having to acquire and modify a new carrier aircraft.

U.S. GOVERNMENT CONTRACTS

    During 1998, 1997 and 1996, approximately 46%, 42% and 45%, respectively, of
our total annual revenues were derived from contracts with the U.S. government
and its agencies or from subcontracts with the U.S. government's prime
contractors. Most of our U.S. government contracts are funded incrementally on a
year-to-year basis. Changes in government policies, priorities or funding levels
through agency or program budget reductions by the U.S. Congress or executive
agencies or the imposition of budgetary constraints could materially adversely
affect our financial condition or results of operations. Customers that
accounted for 10% or more of our consolidated 1998 revenues were NASA, DoD and
ORBIMAGE.

    The accuracy and appropriateness of our direct and indirect costs and
expenses under our contracts with the U.S. government are subject to extensive
regulation and audit by the Defense Contract Audit Agency or by other
appropriate agencies of the U.S. government. These agencies have the right to
challenge our cost estimates or allocations with respect to any such contract.
Additionally, a substantial portion of payments to Orbital under U.S. government
contracts are provisional payments that are subject to potential adjustment upon
audit by such agencies. We believe that any adjustments likely to result from
inquiries or audits of our contracts will not have a material adverse impact on
our financial condition or results of operations. Since Orbital's inception, we
have not experienced any material adjustments as a result of any such inquiries
or audits.

    Orbital's major contracts with the U.S. government fall into three
categories: firm fixed-price contracts, fixed-price incentive fee contracts and
cost-plus-fee contracts. Under firm fixed-price contracts, work performed and
products shipped are paid for at a fixed price without adjustment for actual
costs incurred in connection with the contract. Therefore, we bear the risk of
loss due to increased cost, although some of this risk may be passed on to
subcontractors. Under fixed-price government contracts, we may receive progress
payments, generally in an amount



                                       12
<PAGE>   13


equal to between 80% and 95% of monthly costs and profits, or we may receive
milestone payments upon the occurrence of certain program achievements, with
final payments occurring at project completion. Fixed-price incentive fee
contracts provide for sharing by Orbital and the customer of unexpected costs
incurred or savings realized within specified limits, and may provide for
adjustments in price depending on actual contract performance other than costs.
Costs in excess of the negotiated maximum (ceiling) price and the risk of loss
by reason of such excess costs are borne by Orbital, although some of this risk
may be passed on to subcontractors. Under a cost-plus-fee contract, we recover
our actual allowable costs incurred and receive a fee consisting of a base
amount that is fixed at the inception of the contract and/or an award amount
that is based on the U.S. government's subjective evaluation of the contractor's
performance in terms of the criteria stated in the contract.

    All of our U.S. government contracts and, in general, our subcontracts with
the U.S. government's prime contractors provide that such contracts may be
terminated at will by the U.S. government or the prime contractor, respectively.
Furthermore, any of these contracts may become subject to a government-issued
stop work order under which we would be required to suspend production. In the
event of a termination at will, Orbital would normally be entitled to recognize
the purchase price for delivered items, reimbursement for allowable costs for
work in process and an allowance for reasonable profit thereon or adjustment for
loss if completion of performance would have resulted in a loss. From time to
time we experience contract suspensions and terminations.

REGULATION

    Our ability to pursue our business activities is regulated by various
agencies and departments of the U.S. government and, in certain circumstances,
the governments of other countries. Commercial space launches require licenses
from the U.S. Department of Transportation (the "DoT") and operation of our
L-1011 aircraft requires licenses from certain agencies of the DoT, including
the Federal Aviation Administration. Construction, launch and operation of
commercial communications satellites, including the ORBCOMM communications
network and CCI's business, require licenses from the U.S. Federal
Communications Commission (the "FCC") and frequently require the approval of
international and individual country regulatory authorities. ORBCOMM has
received the necessary FCC regulatory authority to operate its system. ORBCOMM's
international licensees have obtained or are responsible for obtaining the
necessary international regulatory licenses. In addition, U.S.-based commercial
remote imagery satellite systems such as those developed by ORBIMAGE require
licenses from the U.S. Department of Commerce (the "DoC") and the FCC for the
construction, launch and operation of remote imaging satellites. ORBIMAGE has
the necessary DoC licenses and its FCC license to construct, launch and operate
the OrbView-3 and OrbView-4 satellites. ORBIMAGE has applied to DoC to amend its
OrbView-4 license to permit the commercial distribution of hyperspectral imagery
from such satellite. The DoC has indicated that its approval may be subject to
certain limitations, such as delaying release of imagery or degrading spatial
resolution of imagery for commercial uses. Exports of our products, services and
technical information frequently require licenses from the U.S. Department of
State or the DoC.

    There can be no assurance that we will be successful in our efforts to
obtain necessary licenses or regulatory approvals. The inability of Orbital,
ORBCOMM, ORBIMAGE or CCI to secure or maintain any necessary licenses or
approvals or significant delays in obtaining such licenses or approvals could
have a material adverse effect on the financial condition or results of
operations of Orbital.

BACKLOG

    Orbital's contract backlog is attributable to its space and ground
infrastructure systems business. Our firm backlog at December 31, 1998 and 1997
was approximately $1,826,000,000 and $1,040,000,000, respectively. As of
December 31, 1998, approximately 41% of our firm backlog was with the U.S.
government and its agencies or from subcontracts with the U.S. government's
prime contractors. Firm backlog consists of aggregate contract values for firm
product orders, excluding the portion previously included in operating revenues
on the basis of percentage of completion accounting, and including government
contract orders not yet funded in the amounts of approximately $1,300,000,000
and $435,000,000 as of December 31, 1998 and 1997, respectively. Approximately
55% of total firm backlog is currently scheduled to be performed beyond 1999.
Firm backlog excludes unexercised contract options and undefinitized new
contracts having an aggregate potential contract value at December 31, 1998 of
approximately $2,220,000,000.


                                       13
<PAGE>   14


EMPLOYEES

    As of December 31, 1998, Orbital (including ORBCOMM and ORBIMAGE) had
approximately 4,400 full-time permanent employees. We do not have any collective
bargaining agreements with our employees and believe our employee relations are
good.

ITEM 2.  PROPERTIES

    Orbital owns or leases over 1,700,000 square feet of office, engineering and
manufacturing space in various locations throughout the world. In 1998, we
purchased a parcel of real estate adjacent to our corporate headquarters in
Northern Virginia to expand our satellite-related engineering, manufacturing and
operations facilities at this site, which will allow us to consolidate our
existing Northern Virginia and portions of our Maryland work force in a single
integrated site. Orbital expects to convey portions of this land to a
third-party developer shortly so that construction of the buildings can
commence. As such buildings are completed, Orbital expects to lease the
buildings pursuant to long-term leases.

    In 1993, Orbital entered into a 12-year lease agreement for approximately
100,000 square feet of office and engineering space in Dulles, Virginia, which
serves as its corporate headquarters. We own a 59,000 square-foot manufacturing
facility on land adjacent to the Dulles office facility that has office,
engineering and manufacturing space. We intend to increase the size of this
facility by approximately 50,000 to 75,000 square feet over the next year.
Orbital also leases approximately 73,000 square feet of office, engineering and
manufacturing space in McLean, Virginia; 400,000 square feet of office,
engineering and manufacturing space in Germantown, Maryland; 345,000 square feet
of office, engineering and manufacturing space in Chandler, Arizona; 182,000
square feet of office and engineering space in Richmond, British Columbia;
135,000 square feet of office, engineering and manufacturing space in Pomona,
California; 75,000 square feet of office, engineering and manufacturing space in
San Dimas, California; and 82,500 square feet of office, engineering and
manufacturing space in Santa Clara, California. We lease or own other smaller
facilities, offices or manufacturing space around the United States, in Canada
and in Russia. Although completion of our existing and pending contracts may in
the future require additional manufacturing capacity, we believe that our
existing facilities are adequate for our near-term requirements and that such
facilities, along with those to be constructed, will be adequate for our
medium-term requirements.

ITEM 3.  LEGAL PROCEEDINGS

    In the first quarter of 1999, a number of class action lawsuits were filed
in federal court in the Eastern District of Virginia against Orbital, an officer
and an officer/director, alleging violations of the federal securities laws
during the period from April 21, 1998 through February 16, 1999 and seeking
monetary damages. In December 1998, Thomas van der Heyden filed a lawsuit in the
Circuit Court for Montgomery County, Maryland alleging that Orbital is in actual
or anticipatory breach of obligations allegedly imposed on Orbital in a judgment
in a previous action brought by plaintiff against CTA. The plaintiff claims that
he is entitled to a sum exceeding $30 million from Orbital, as
successor-in-interest to CTA. We believe that the allegations in the legal
proceedings described above are without merit and intend to vigorously defend
against the allegations. In addition, under the terms of the CTA acquisition, we
believe we are entitled to indemnification from CTA for all or a part of any
damages arising from the van der Heyden litigation.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

    There was no matter submitted to a vote of our security holders during the
fourth quarter of 1998.


                                       14

<PAGE>   15


ITEM 4A.  EXECUTIVE OFFICERS OF THE REGISTRANT

    The following table sets forth the name, age and position of each of the
executive officers of Orbital as of March 1, 1999. All executive officers are
elected annually and serve at the discretion of the Board of Directors.
<TABLE>
<CAPTION>

                                   NAME            AGE                       POSITION
                          ---------------------    ---  ---------------------------------------------------------
<S>                                                <C>  <C>
                          David W. Thompson....    44   Chairman of the Board, President and Chief Executive
                                                        Officer
                          James R. Thompson....    62   Director, Executive Vice President and General Manager/
                                                        Launch Systems Group
                          Robert R. Lovell.....    62   Executive Vice President and General Manager/Space
                                                        Systems Group
                          John P. Huyett.......    45   Executive Vice President and General Manager/Satellite
                                                        Access Products Group
                          Robert D. Strain.....    42   Executive Vice President and General Manager/Electronics
                                                        and Sensor Systems Group
                          Daniel E. Friedmann..    42   Executive Vice President and General Manager/Systems
                                                        Integration and Software Group
                          Jeffrey V. Pirone....    38   Executive Vice President and Chief Financial Officer
                          Michael D. Griffin...    49   Executive Vice President and Chief Technical Officer
                          Antonio L. Elias.....    49   Senior Vice President for Advanced Programs
                          Leslie C. Seeman.....    46   Senior Vice President, General Counsel and Secretary
</TABLE>

- ----------

    David W. Thompson is a co-founder of Orbital and has been Chairman of the
Board, President and Chief Executive Officer of Orbital since 1982. Prior to
founding Orbital, Mr. Thompson was employed by Hughes Electronics Corporation as
special assistant to the President of its Missile Systems Group and by NASA at
the Marshall Space Flight Center as a project manager and engineer, and also
worked on the Space Shuttle's autopilot design at the Charles Stark Draper
Laboratory. Mr. Thompson serves as Chairman of Magellan, Chairman and Chief
Executive Officer of ORBIMAGE and as a director of ORBCOMM and CCI. Mr. Thompson
is a Fellow of the American Institute of Aeronautics and Astronautics, the
American Astronautical Society and the Royal Aeronautical Society.

    James R. Thompson (who is not related to David W. Thompson) has been
Executive Vice President and General Manager/Launch Systems Group since 1993 and
a director of Orbital since 1992. Mr. Thompson was Executive Vice President and
Chief Technical Officer of Orbital from 1991 to 1993. He was Deputy
Administrator of NASA from 1989 to 1991. From 1986 until 1989, Mr. Thompson was
Director of NASA's Marshall Space Flight Center. He was Deputy Director for
Technical Operations at Princeton University's Plasma Physics Laboratory from
1983 through 1986. Before that, he had a 20-year career with NASA at the
Marshall Space Flight Center. He is a director of Nichols Research Corp. and
SPACEHAB Incorporated.

    John P. Huyett has been Executive Vice President and General  Manager,
Satellite Access Products since January 1, 1999. Mr. Huyett also serves,
effective January 1, 1999, as President and Chief Executive Officer of Magellan.
Mr. Huyett joined Magellan as its Vice President and Chief Financial Officer in
1998. From 1993 through 1998, Mr. Huyett was the Vice President and Chief
Financial Officer of Avant! Corporation and its predecessor, Integrated Silicon
Systems, a software company. From 1985 through 1993, Mr. Huyett was a partner at
KPMG LLP. Mr. Huyett is a director of Magellan.

    Robert R. Lovell has been Executive Vice President and General Manager/Space
Systems Group since 1997. From 1994 to 1997, he was Senior Vice President for
Special Projects at Orbital. Mr. Lovell previously served as Executive Vice
President and General Manager/Space Systems Group from 1993 to 1994. From 1990
to 1993, he was President/Space Systems Division of Orbital and, from 1987 to
1989, he served as Vice President/Space Applications. From 1980 to 1987, Mr.
Lovell was employed by NASA as Director of the Communications Division in the
Office of Space Science and Applications. Before that, he had an 18-year career
with NASA at the Lewis Research Center. Mr. Lovell is a director of CCI.

    Michael D. Griffin has been  Executive  Vice  President and Chief  Technical
Officer since 1997. From 1996 to 1997, Dr. Griffin served as Executive Vice
President/Space Systems Group. Dr. Griffin joined Orbital in 1995 when he was
appointed Senior Vice President and Chief Technical Officer. From 1994 to 1995,
he was Senior Vice President for Program Development at Space Industries
International. From 1991 to 1994, he served as Chief


                                       15
<PAGE>   16


Engineer of NASA and, from 1989 to 1991, was Deputy Director for Technology at
the Strategic Defense Initiative Organization. Dr. Griffin is a director of
Magellan.

    Robert D. Strain has been Executive Vice President and General
Manager/Electronics and Sensor Systems Group since 1996. From 1994 until 1996,
he was Vice President for Finance and Manufacturing at Orbital. Prior to that he
served in a variety of senior-level financial positions with Fairchild Space and
Defense Corporation, including Vice President of Finance, Treasurer and
Controller.

    Daniel E. Friedmann has been Executive Vice President and General
Manager/Systems Integration and Software Group since 1996. He continues to serve
as President and Chief Executive Officer of Orbital's subsidiary, MDA, a
position he has held since 1995. From 1992 to 1995, he served as Executive Vice
President and Chief Operating Officer of MDA. Between 1979 and 1992, he held a
variety of positions at MDA, including serving as Vice President of various
divisions.

    Jeffrey V. Pirone has been  Executive Vice President and Chief  Financial
Officer since 1996. From 1993 until 1996, Mr. Pirone served as Vice President
and Controller of Orbital. Mr. Pirone joined Orbital as Controller in 1991, and
prior to that was a Senior Manager at KPMG LLP. Mr. Pirone is a director of
Magellan and ORBCOMM.

    Antonio L. Elias has been Senior Vice President for Advanced Programs since
August 1997. From January 1996 until August 1997, Dr. Elias served as Senior
Vice President and Chief Technical Officer. From May 1993 through December 1995
he was Senior Vice President for Advanced Projects and was Senior Vice
President/Space Systems Division from 1990 to April 1993. He was Vice
President/Engineering of Orbital from 1989 to 1990 and was Chief Engineer from
1986 to 1989. From 1980 to 1986, Dr. Elias was an Assistant Professor of
Aeronautics and Astronautics at Massachusetts Institute of Technology.

    Leslie C. Seeman has been Senior Vice President of Orbital since 1993 and
General Counsel and Secretary of Orbital since 1989. From 1989 to 1993, she was
also Vice President of Orbital, and from 1987 to 1989, Ms. Seeman was Assistant
General Counsel of Orbital. From 1984 to 1987, she was General Counsel of Source
Telecomputing Corporation, a telecommunications company. Prior to that, she was
an attorney at the law firm of Wilmer, Cutler and Pickering.


                                       16
<PAGE>   17
                                     PART II

ITEM 5.  MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

    On March 22, 1999, there were 1,325 Orbital stockholders of record.

    Our common stock began trading on the New York Stock Exchange ("NYSE") on
July 10, 1998 under the symbol ORB. Prior to that our common stock was traded on
the Nasdaq National Market under the symbol ORBI. The range of high and low
sales prices of Orbital common stock from 1996 through 1998, as reported on
Nasdaq or the NYSE, as applicable, was as follows:

<TABLE>
<CAPTION>

                           1998             HIGH        LOW
                  --------------------   ----------  ---------
<S>                                    <C>         <C>
                  4th Quarter.........   $  44       $  19 1/2
                  3rd Quarter.........   $  39       $  17
                  2nd Quarter.........   $  50       $  32 1/4
                  1st Quarter.........   $  46 1/2   $  29

<CAPTION>

                           1997             HIGH         LOW
                  --------------------   ----------  ---------
<S>                                    <C>         <C>
                  4th Quarter.........   $  30 3/4   $  21
                  3rd Quarter.........   $  25       $  15 7/8
                  2nd Quarter.........   $  18       $  12 3/4
                  1st Quarter.........   $  19 1/4   $  13 3/4

<CAPTION>

                           1996             HIGH       LOW
                  --------------------   ----------  ---------
<S>                                    <C>         <C>
                  4th Quarter.........   $  21       $  16 1/4
                  3rd Quarter.........   $  20 7/8   $  16 3/8
                  2nd Quarter.........   $  19 7/8   $  13
                  1st Quarter.........   $  16 1/8   $  11 3/4
</TABLE>

    We have never paid any cash dividends on our common stock. We presently
intend to retain future earnings for working capital and product development and
therefore do not anticipate paying cash dividends on our common stock at any
time in the foreseeable future. In addition, we are prohibited from paying cash
dividends under an existing credit facility.

    The transfer agent for our Common Stock is:
         The First National Bank of Boston
         c/o Boston Equiserve
         P.O. Box 8040
         Boston, MA 02266-8040
         Telephone: (617) 575-3170 or (800) 730-4001
         www.bostonequiserve.com

    The trustee for our 5% convertible subordinated notes due 2002 is:
         Deutsche Bank AG, New York Branch
         31 W. 52nd St.
         New York, NY 10019


ITEM 6.  SELECTED FINANCIAL DATA

SELECTED CONSOLIDATED FINANCIAL DATA

     Management has determined to restate its previously issued consolidated
financial statements as of and for the years ended December 31, 1998, 1997, 1996
and 1995 with respect to certain matters described in Note 1A to the Company's
consolidated financial statements. The following selected consolidated financial
data should be read in conjunction with the consolidated financial statements
and notes thereto included in this Report. The consolidated operating data and
other data for the three-year period ended December 31, 1998 and the
consolidated balance sheet data at December 31, 1998 and 1997 are derived from
and should be read in conjunction with the audited consolidated financial
statements and notes thereto included in this Report. The consolidated operating
data and balance sheet data for the years ended December 31, 1995 and


                                       17
<PAGE>   18
\
1994 and the consolidated balance sheet data at December 31, 1996, 1995 and 1994
are derived from consolidated financial statements not included or incorporated
by reference herein.

<TABLE>
<CAPTION>

                                                                                YEARS ENDED DECEMBER 31,
                                                          -------------------------------------------------------------------
                                                              1998         1997          1996          1995          1994
                                                          ------------ -------------  -----------   -----------  -----------
                                                           (restated)   (restated)    (restated)    (restated)
                                                                           (IN THOUSANDS, EXCEPT SHARE DATA)
<S>                                                     <C>          <C>            <C>           <C>          <C>
      OPERATING DATA:
        Revenues.......................................   $   730,662  $    546,008   $   449,787   $   359,840  $   301,576
        Costs of goods sold............................       549,628       413,361       332,581       271,146      216,417
                                                          -----------  ------------   -----------   -----------  -----------
        Gross profit...................................       181,034       132,647       117,206        88,694       85,159
        Research and development expenses..............        49,384        33,140        23,068        28,558       17,259
        Selling, general and administrative expenses...       106,812        88,148        77,247        64,170       53,165
        Amortization of goodwill.......................         9,713         3,852         3,134         3,221        2,360
        Asset impairment charges.......................         2,479            --            --           --            --
                                                          -----------  ------------   -----------   -----------  -----------
        Income (loss) from operations..................        12,646         7,507        13,757        (7,255)      12,375
        Net investment income (expense)................        (1,279)         (990)          (49)        1,131         (244)
        Equity in earnings (losses) of affiliates......       (76,815)      (25,094)       (7,008)         (644)      (1,264)
        Non-controlling interests in (earnings) losses
          of consolidated subsidiaries.................        14,112         2,638         1,473           427           --
        Gain on sale of subsidiary equity..............            --        21,810            --            --           --
        Acquisition expenses...........................            --        (4,343)           --        (3,441)        (503)
                                                          -----------  ------------   -----------   -----------  -----------
        Income (loss) before provision (benefit) for
          income taxes, extraordinary items and
          cumulative effect of accounting change.......       (51,336)        1,528         8,173        (9,782)      10,364
        Provision (benefit) for income taxes...........         5,216        12,933           211        (6,569)       2,744
                                                          -----------  ------------   -----------   -----------  -----------
        Income (loss) before extraordinary item and
          cumulative effect of accounting change.......       (56,552)      (11,405)        7,962        (3,213)       7,620
        Extraordinary item -- gain on sale of assets,
          net of taxes.................................            --            --         1,980            --           --
        Cumulative effect of accounting change, net of
          taxes........................................            --            --            --        (2,377)          --
                                                          -----------  ------------   -----------   -----------  -----------
        Net income (loss)..............................      $(56,552)     $(11,405)       $9,942       $(5,590) $     7,620
                                                          ===========  ============   ===========   ===========  ===========
      NET INCOME (LOSS) PER COMMON SHARE(1):
        Income (loss) before extraordinary items and
          cumulative effect of accounting change.......        $(1.59)       $(0.35)        $0.27        $(0.12)       $0.33
        Extraordinary item -- gain on sale of assets,
          net of taxes.................................            --            --          0.07            --           --
        Cumulative effect of accounting change.........            --            --            --         (0.09)          --
                                                          -----------  ------------   -----------   -----------  -----------
                                                               $(1.59)       $(0.35)        $0.34        $(0.21)       $0.33
                                                          ===========  ============   ===========   ===========  ===========
        Shares used in computing net income (loss) per
          common share.................................    35,624,888    32,283,138    29,137,361    26,207,746   23,191,553
                                                          ===========  ============   ===========   ===========  ===========
      NET INCOME (LOSS) PER COMMON SHARE, ASSUMING
        DILUTION(2):
        Income (loss) before extraordinary items and
          cumulative effect of accounting change.......        $(1.59) $      (0.35)  $      0.30   $     (0.12) $      0.32
        Extraordinary item -- gain on sale of assets,
          net of taxes.................................            --            --          0.04            --           --
        Cumulative effect of accounting change.........            --            --            --         (0.09)          --
                                                          -----------  ------------   -----------   -----------  -----------
                                                               $(1.59)       $(0.35)        $0.34        $(0.21) $      0.32
                                                          ===========  ============   ===========   ===========  ===========
        Shares used in computing net income (loss) per
          common share, assuming dilution..............    35,624,888    32,283,138    31,616,119    26,207,746   27,309,336
                                                          ===========  ============   ===========   ===========  ===========
      BALANCE SHEET DATA:
        Cash and investments...........................       $23,190       $15,126       $33,750       $35,030  $    40,345
        Net working capital............................        53,052        53,201        71,055        78,778       57,449
        Total assets...................................       895,192       777,885       509,613       472,900      441,042
        Short-term borrowings..........................        26,814        29,767        38,969        11,907       28,977
        Long-term obligations, net.....................       181,281       200,194        35,326        96,990       86,068
        Stockholders' equity...........................       419,352       313,984       323,795       238,116      206,943
</TABLE>

- ----------
(1)  Net income (loss) per common share is calculated using the
     weighted average number of shares outstanding during the periods.
(2)  Net income (loss) per common share, assuming dilution, is calculated using
     the weighted average number of shares and dilutive equivalent shares
     outstanding during the periods, plus the dilutive effect of an assumed
     conversion of our convertible subordinated notes.



                                       18

<PAGE>   19
ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
         OF OPERATIONS

OVERVIEW

With the exception of historical information, the matters discussed below under
the headings "Recent Developments," "Results of Operations" and "Liquidity and
Capital Resources" and elsewhere in this Annual Report on Form 10-K include
forward-looking statements that involve risks and uncertainties, many of which
are beyond our control. We wish to caution readers that a number of important
factors, including those identified below in "Outlook: Issues and
Uncertainties," may affect our actual results and may cause actual results to
differ materially from those in any forward-looking statement.

    Our products and services are grouped into three general business sectors:
space and ground infrastructure systems, satellite access products and satellite
services. Space and ground infrastructure systems include launch vehicles,
satellites and related space systems, electronics and sensor systems, and
satellite ground systems and software. Satellite access products include
satellite-based navigation, positioning and communications products and
transportation management systems. Satellite services include satellite-based
two-way mobile data communications services, satellite-based remote imaging
services, our new ORBNAV initiative relating to satellite-based automotive
information services and satellite-based voice communications services provided
by ORBCOMM and ORBIMAGE and to be provided by ORBNAV and CCI, respectively.

    We are accounting for our investments in ORBCOMM, ORBIMAGE and CCI using
the equity method of accounting. In accordance with the equity method of
accounting, we recognize as equity in earnings (losses) of affiliates our
proportionate share of ORBCOMM's and ORBIMAGE's profits and losses based on our
percentage of common equity ownership or partnership interest. In accordance
with a modified equity method of accounting, we currently recognize as equity
in earnings (losses) of affiliates 100% of CCI's losses. We also recognize as
equity in losses of affiliates our proportionate share of preferred dividends
to other investors in such entities. We also recognize 100% of the revenues
earned and costs incurred on sales of products and services to ORBCOMM and
ORBIMAGE. However, as ORBCOMM and ORBIMAGE are currently capitalizing
substantially all system construction costs, including amounts paid to Orbital,
we eliminate as equity in earnings (losses) of affiliates our share of our
profits from sales to ORBCOMM and ORBIMAGE based on our percentage of common
equity ownership or partnership interest. We do not recognize any revenues or
related profits on sales of products and services to CCI since we have provided
substantially all CCI's funding.

    Certain of the 1998, 1997, 1996 and 1995 financial information has been
restated. See Notes 1A and 12 to the consolidated financial statements.

RECENT DEVELOPMENTS

    In April 1998, we sold 3,450,000 shares of our common stock in a public
offering at $45.81 per share, generating net proceeds of approximately
$150,000,000.

    In July 1998, our common stock began trading on the New York Stock Exchange
under the ticker symbol "ORB." Our stock had previously traded on the Nasdaq
National Market under the symbol "ORBI."

    In August 1998, we entered into a stock purchase agreement with CCI pursuant
to which we agreed, subject to the satisfaction by CCI of certain milestones and
conditions, to purchase up to $50,000,000 of CCI's non-voting convertible
preferred shares, with an option to purchase an additional $50,000,000 of
preferred shares, and to provide vendor financing. In connection with the
execution of the stock purchase agreement, we entered into a satellite and
launch vehicle procurement contract with CCI valued at approximately
$480,000,000 for the satellites (and a price to be determined for the launch
vehicles in the event we procure them). As of December 31, 1998, we had
purchased $22,000,000 of the preferred shares and had not provided any vendor
financing. Should CCI not achieve its financial or operational milestones, some
of which entail raising capital, or if an adequate market for its products and
services should not develop, we may be required to write off all, or a portion,
of this investment.

    In October 1998, we adopted a stockholder rights plan in which preferred
stock purchase rights were granted as a dividend at the rate of one right for
each share of common stock to stockholders of record on November 13, 1998. The
plan is designed to deter coercive or unfair takeover tactics. The rights become
exercisable only if a person or group in the future becomes the beneficial owner
of 15% or more of our common stock, or announces a tender or exchange offer that
would result in its ownership of 15% or more of our common stock. Each right,
when


                                       19
<PAGE>   20
exercisable, entitles the holder to purchase one-one thousandth of a share of
Series B Junior Participating Preferred Stock. Under certain circumstances, each
holder of a right will be able to exercise the right and receive common stock
having a value equal to two times the exercise price. The rights are generally
redeemable by our Board of Directors at a redemption price of $0.005 per right
and expire on October 31, 2008.

    On December 31, 1998, we acquired the transportation systems business of
Raytheon Company for approximately $21,000,000 in cash. We merged the acquired
business into our existing transportation management systems business.

RESULTS OF OPERATIONS

    As noted above, certain of the 1998, 1997 and 1996 financial information
presented below has been restated. See Note 1A to the consolidated financial
statements.

<TABLE>
<CAPTION>

                                    1998 (restated)                1997(restated)               1996 (restated)
                                  ------------------             -----------------            ------------------
                                              GROSS                        GROSS                          GROSS
                                  REVENUES   PROFITS             REVENUES  PROFITS            REVENUES   PROFITS
                                  --------   -------             --------  -------            --------   -------
                                                               (DOLLARS IN THOUSANDS)
<S>                              <C>       <C>                  <C>       <C>                <C>        <C>
   SPACE AND GROUND
     INFRASTRUCTURE
     SYSTEMS...................  $613,511  $152,146             $474,452   $114,653          $377,166    $93,899
     Launch Vehicles...........   179,591    43,592              120,203     26,516           103,687     18,769
     Satellites................   227,504    48,685              175,450     42,472           101,891     22,625
     Electronics and Sensor
       Systems.................   111,034    35,446              100,554     26,263            92,070     26,608
     Satellite Ground Systems
       and Software............    95,382    24,423               78,245     19,402            79,518     25,897
   SATELLITE ACCESS
     PRODUCTS..................   116,392    28,886               71,384     18,205            71,188     25,134
   SATELLITE SERVICES..........       759         2                  172       (211)            1,433     (1,827)
                                 --------  --------             --------   --------          --------   --------
   CONSOLIDATED TOTALS.........  $730,662  $181,034             $546,008   $132,647          $449,787   $117,206
                                 ========  ========             ========   ========          ========   ========
</TABLE>


REVENUES

    Our consolidated revenues for the years ended December 31, 1998, 1997 and
1996 were $730,662,000, $546,008,000 and $449,787,000, respectively.

    Space and Ground Infrastructure Systems. Revenues from our space and ground
infrastructure systems sector increased to $613,511,000 in 1998, from
$474,452,000 in 1997 and $377,166,000 in 1996.

    Revenues from our launch vehicles increased to $179,591,000 in 1998, from
$120,203,000 in 1997 and $103,687,000 in 1996. The increase in revenues in 1998
and 1997 was attributable to a number of factors, including increased work
performed under contracts received for our Taurus launch vehicle, a significant
increase in new orders for our Pegasus and suborbital launch vehicles and
increased work performed on the X-34 reusable launch vehicle.

    Revenues from sales of satellites increased to $227,504,000 in 1998, from
$175,450,000 in 1997 and $101,891,000 in 1996. Satellite revenues increased
from 1997 to 1998 based on work performed on new satellite orders. The increase
in 1997 satellite revenues was primarily due to new satellite orders received
in the second half of 1996 and in 1997. Revenues in 1998 and 1997 also included
approximately $51,471,000 and $54,090,000, respectively, of sales generated by
the satellite contracts we acquired from CTA in August 1997.

    Revenues from electronics and sensor systems increased to $111,034,000 in
1998, from $100,554,000 in 1997 and $92,070,000 in 1996. The increase in 1998
and 1997 revenues was primarily attributable to work performed on new orders for
defense electronics products received during 1997 and early 1998.

    Revenues from satellite ground systems and software products increased to
$95,382,000 in 1998, from $78,245,000 in 1997 and $79,518,000 in 1996. The
increase in 1998 revenues is primarily due to work performed on



                                       20
<PAGE>   21

orders received in 1997 and 1998, including work on a new remote imaging system.
The decrease in 1997 revenues from 1996 revenues was primarily due to the sale
in late 1996 of a software-related business that had generated 1996 revenues of
approximately $15,755,000.

    Orbital's space and ground infrastructure systems sector revenues included
sales to ORBCOMM of approximately $35,479,000, $57,988,000 and $47,215,000 in
1998, 1997 and 1996, respectively, and to ORBIMAGE of approximately $89,006,000
and $29,923,000 in 1998 and 1997, respectively. We expect 1999 sales to our
satellite services affiliates to be less than those recorded in 1998 primarily
because the basic ORBCOMM satellite construction and launch program is nearing
completion.

    Satellite Access Products. Revenues from sales of consumer, high-precision
and automotive satellite-based positioning and navigation products, satellite
communications products and transportation management systems increased to
$116,392,000 in 1998, from $71,384,000 in 1997 and $71,188,000 in 1996. Revenues
in 1998 included approximately $44,636,000 of sales generated by our
high-precision navigation products that were acquired as a result of the
December 1997 merger of Ashtech with our Magellan subsidiary. Although 1998
revenues from satellite access products were greater than 1997 revenues,
revenues were below our expectations due to increased competition in consumer
products and slower sales of automotive navigation products.

Gross Profit/Costs of Goods Sold

    Costs of goods sold include the costs of personnel, materials, subcontracts
and overhead related to commercial products and under various development and
production contracts. Gross profit depends on a number of factors, including our
mix of contract types and costs incurred thereon in relation to estimated costs.
Our consolidated gross profit for 1998, 1997 and 1996 was $181,034,000 (25% of
revenues), $132,647,000 (24% of revenues) and $117,206,000 (26% of revenues),
respectively.

    Space and Ground Infrastructure Systems. Gross profit from our space and
ground infrastructure systems sector was $152,146,000 (25% of sector revenues),
$114,653,000 (24% of sector revenues) and $93,899,000 (25% of sector revenues)
for 1998, 1997 and 1996, respectively.

    Gross profit margins from our space and ground infrastructure systems sector
for 1998 were generally consistent with 1997 margins. Gross profit margins were
slightly higher in 1996 due to the inclusion of higher margins from a
software-related business that was part of our ground systems business and was
sold in late 1996. Gross profit margins in this sector are impacted by
management's periodic assessments and reevaluations of programmatic risks
included in estimated costs to complete long-term contracts. During the fourth
quarter of 1997, the Company recognized approximately $5,000,000 of contract
costs related to increases in estimates to complete certain space launch vehicle
and satellite contracts. During 1998 and 1997, the Company recognized increases
in gross margins of $1,902,000 and $2,647,000, respectively, related to the
write-off or expiration of certain Canadian development loans no longer required
or not expected to be repaid.

    Satellite Access Products. Gross profit from our satellite access products
sector was $28,886,000 (25% of sector revenues), $18,204,000 (26% of sector
revenues) and $25,134,000 (35% of sector revenues) for 1998, 1997 and 1996,
respectively. The overall increase in 1998 gross profit margins when compared to
1997 margins is due to the inclusion of higher margin, high-precision
positioning and navigation product lines acquired from Ashtech offset, in part,
by lower margins achieved on other consumer and automotive navigation product
sales. The decrease in gross profit margins from 1996 to 1997 was due to lower
unit sales prices for consumer products and certain fourth quarter 1997
reorganizational charges incurred by Magellan.

    During 1998 and 1997, Magellan recognized approximately $12,500,000 and
$500,000, respectively, of charges for inventory obsolescence relating to
consumer navigation products. Magellan continues to face increased competition,
which places significant pressure on individual product lifetimes and inventory
levels.

Research and Development Expenses

    Research and development expenses represent our self-funded product
development activities and exclude direct customer-funded development. Research
and development expenses during 1998, 1997 and 1996 were $49,384,000 (7% of
revenues), $33,140,000 (6% of revenues) and $23,068,000 (5% of revenues),
respectively. Research and



                                       21

<PAGE>   22
development spending during these periods related primarily to the development
of new or improved satellite access products, improved launch vehicles, and new
satellite initiatives. Research and development expenses in 1998 also included
approximately $5,000,000 of costs related to identifying and resolving certain
technical issues arising on ORBCOMM data communications satellites.

Selling, General and Administrative Expenses

    Selling, general and administrative expenses include the costs of marketing,
advertising, promotion and other selling expenses, as well as the costs of the
finance, legal, administrative and general management functions of Orbital.
Selling, general and administrative expenses for 1998, 1997 and 1996 were
$106,812,000 (15% of revenues), $88,148,000 (16% of revenues) and $77,247,000
(17% of revenues), respectively. In the fourth quarter of 1997, we recognized
increases in allowances for receivables related to a certain satellite
construction contract of approximately $3,000,000. While selling, general and
administrative expenses as a percentage of revenues was consistent from 1998 to
1997, the total amount of selling, general and administrative costs increased
substantially, primarily as a result of growth in our space and ground
infrastructure systems sector and the impact of various business and product
line acquisitions. The decrease in selling, general and administrative expenses
as a percentage of revenues in 1997 from 1996 was primarily attributable to
significant growth in space and ground infrastructure systems revenues, along
with only modest growth in selling, general and administrative expenses
attributable to those product lines.

Net Investment Income (Expense)

    Net investment income (expense) was ($1,279,000), ($990,000) and ($49,000)
for 1998, 1997 and 1996, respectively. Investment income reflected interest
earnings on short-term investments and realized gains and losses on investments,
reduced by interest expense on outstanding debt of $8,886,000, $2,894,000 and
$1,412,000 in 1998, 1997 and 1996, respectively. Interest expense was net of
capitalized interest of approximately $11,638,000, $7,257,000 and $8,240,000 in
1998, 1997 and 1996, respectively.

Equity in Earnings (Losses) of Affiliates and Non-Controlling Interests in
(Earnings) Losses of Consolidated Subsidiaries

    Equity in earnings (losses) of affiliates and non-controlling interests in
(earnings) losses of consolidated subsidiaries were ($76,815,000), ($25,094,000)
and ($7,008,000) for 1998, 1997 and 1996, respectively. These amounts primarily
include our proportionate share of the current period earnings and losses of our
noncontrolled and unconsolidated affiliates (ORBCOMM, ORBIMAGE and CCI),
preferred dividends and beneficial conversion rights to other investors in such
entities (if any) and the elimination of our proportionate share of profits,
when appropriate. The increases in 1998 and 1997 were primarily due to increased
operational and system depreciation expenses and resulting losses at ORBCOMM. We
expect equity in earnings (losses) of affiliates to increase in 1999 primarily
due to increased losses at ORBCOMM.

Gain on Issuance of Subsidiary Equity

    We recorded a gain on issuance of subsidiary equity of $ $21,810,000 in 1997
related to the issuance of additional equity by our Magellan subsidiary.

Provision for Income Taxes

    We recorded consolidated income tax provisions of $5,216,000, $12,933,000
and $211,000 for 1998, 1997 and 1996, respectively. Our provisions for these
periods were primarily due to foreign taxes attributable to our Canadian
operations. The 1997 tax provision includes a deferred tax provision of
approximately $10,898,000 relating to the ORBIMAGE preferred stock transaction
in 1997.

    At December 31, 1998, we had U.S. federal net operating loss carryforwards
(portions of which expire beginning in 2004) of approximately $278,000,000, U.S.
research and experimental income tax credit carryforwards of approximately
$3,148,000, and foreign investment income tax credit carryforwards (subject to
expiration in 2008) of approximately $5,000,000. Such net operating loss
carryforwards and tax credits are subject to certain limitations



                                       22
<PAGE>   23

and other restrictions. At December 31, 1998 and 1997, we provided a valuation
allowance of $94,751,000 and $66,889,000, respectively, against certain of our
consolidated deferred tax assets.

Net Income (Loss)

    Our consolidated net income (loss) for the years ended December 31, 1998,
1997 and 1996 was ($56,552,000), ($11,405,000) and $9,942,000, respectively.

    During 1998, our satellite access products sector continued to face
increased competition in consumer products and slower sales of automotive
navigation products, placing pressure on revenues and margins. Magellan has
introduced new products and is implementing cost savings measures intended to
moderate the unfavorable trends experienced in 1998 in this sector. In addition,
this sector incurred significant costs in 1998 associated with the integration
and restructuring of Ashtech and Magellan and research and development with
respect to new products and enhancements of existing products. Net income for
1997 included a $21,810,000 gain on the issuance of Magellan stock.

LIQUIDITY AND CAPITAL RESOURCES

    Our growth has required substantial capital to fund expanding working
capital needs, investments in affiliates, certain business acquisitions, new
business initiatives, research and development and capital expenditures. We have
funded these requirements to date, and expect to fund our future requirements,
through cash generated by operations, working capital, loan facilities,
asset-based financings, joint venture arrangements and private and public equity
and debt offerings. We expect to continue to pursue potential acquisitions, new
business opportunities and equity investments that we believe would enhance our
businesses and to fund such transactions through existing cash, loan facilities,
joint ventures, the issuance of equity and/ or debt securities, asset-based
financings, and cash generated by operations.

    At December 31, 1998, cash and investments were $23,190,000, and we had
total debt obligations outstanding of approximately $208,095,000. The
outstanding debt is comprised of our $100,000,000 5% convertible subordinated
notes, advances under our line of credit facilities, secured and unsecured
notes, and asset-based financings. Cash and investments at December 31, 1998
included approximately $7,922,000 of cash and short-term investments restricted
against outstanding letters of credit. Our current ratio was 1.2 at December 31,
1998 and 1997.

    In 1998, we amended and restated our primary credit facility to increase the
maximum amount available under a revolving line of credit from $100,000,000 to
$200,000,000 and to modify certain financial covenants. At December 31, 1998,
$36,000,000 was outstanding on the facility. During the first quarter of 1999,
the facility was amended to modify a financial covenant to provide full
availability under the facility. The interest rate charged under the facility is
a variable rate based on the prime rate or LIBOR. The weighted average interest
rate on borrowings outstanding under this facility at December 31, 1998 was
7.5%. The facility is secured by accounts receivable, prohibits the payment of
cash dividends, contains certain covenants with respect to our working capital
levels, fixed charges ratio, leverage ratio and net worth, and expires in
December 2002.

    During 1998, we provided $34,500,000 in capital to ORBCOMM. We currently
estimate that our share of additional funding for ORBCOMM's 1999 capital needs
could exceed $30,000,000, of which $18,450,000 has been contributed so far in
1999. We expect to fund our share of ORBCOMM's capital needs through existing
resources, including our primary credit facility. In addition, during 1998,
Orbital deferred invoicing ORBCOMM for approximately $35,144,000 of work
performed under our ORBCOMM satellite and launch procurement agreement. During
1999, we may defer up to $25,000,000 of invoicing for work done under our
ORBCOMM procurement agreement. One-half of the deferred invoice amounts has
been, and is expected to continue to be, advanced to Orbital by an affiliate of
Teleglobe Inc.


                                       23
<PAGE>   24

    Our operations provided net cash of approximately $48,205,000 during 1998.
Also during 1998, in addition to our investment in ORBCOMM, we invested
approximately (i) $22,000,000 in CCI, (ii) $48,263,000 in capital expenditures
for various satellite and launch vehicle production, manufacturing and test
equipment and office equipment, and (iii) $22,751,000 in business acquisitions.
In the event CCI meets various operational and financial milestones, we may
invest an additional $28,000,000 in CCI over the next two years.

    We are expanding our offices and satellite-related engineering,
manufacturing and operations facilities adjacent to our Dulles, Virginia
headquarters. Construction is scheduled to commence in the first half of 1999
and we expect completion in 2001. To finance the majority of this expansion,
Orbital is pursuing various financing alternatives, including third-party debt
financings and a "build-to-suit" agreement.

    On March 18, 1999, MDA and Toronto-based Spar Aerospace Limited signed an
asset purchase agreement pursuant to which MDA will acquire Spar's robotics
division for approximately $43,000,000 in cash. The transaction is expected to
close during the second quarter of 1999. Approximately one-half of the purchase
price will be paid at closing and the balance is payable one year from closing.
We expect to fund the first installment of the purchase price through an
existing credit facility, and have received a commitment from a lender to
finance the second installment due in 2000.

    In late 1998, we agreed to enter into an exclusive $50,000,000 joint venture
with Hertz whereby Hertz will offer Magellan's automotive navigation systems in
its rental cars in the U.S., Canada and Europe. The agreement, which is subject
to negotiation of the joint venture documents, contemplates that we will receive
a 60% interest in the venture in exchange for a $30,000,000 investment to be
made during 1999 and 2000.

    We expect that our capital needs for 1999 will be provided by working
capital, cash flows from operations, existing or new credit facilities, and
operating lease arrangements. To support further business expansion, we may also
consider equity and debt financings.

NEW ACCOUNTING PRONOUNCEMENTS

    In 1998, the Financial Accounting Standards Board adopted Statement of
Financial Accounting Standards No. 133, "Accounting for Derivative Instruments
and Hedging Activities" ("SFAS 133"). SFAS 133 becomes effective June 15, 1999
and will require the company to disclose additional information on its hedging
activities.

    Also in 1998, the Accounting Standards Executive Committee issued Statement
of Position 98-5, "Reporting on the Costs of Start-Up Activities" ("SOP 98-5").
Initial application by the company of SOP 98-5 was as of January 1, 1998. This
SOP requires costs of start-up activities and organization costs to be expensed
as incurred. SOP 98-5 also amended certain sections of Statement of Position
81-1, "Accounting for Performance of Construction-Type and Certain
Production-Type Contracts" ("SOP 81-1"), which addresses revenue recognition on
long-term contracts using the percentage-of-completion method of accounting. The
impact of adopting SOP 98-5 in 1998 was not significant.

YEAR 2000 ISSUES

    We have developed a plan to prepare for potential "Year 2000" issues with
respect to various operational, technical and financial computer-related
systems. The plan has been designed to minimize risk to Orbital and its
customers using a standard industry five-phase approach. The five phases are
awareness, assessment, renovation, validation and implementation. We have
substantially completed the awareness and assessment phases, including
preparation of a comprehensive inventory of potentially affected systems. In
many cases renovation work is well underway and validation testing has begun
with respect to certain critical systems.

    We currently plan to achieve our overall goal of Year 2000 readiness in
mid-1999. The first half of 1999 will be devoted to renovating, validating and
implementing our corrective action plan by reprogramming affected software when
appropriate and feasible, obtaining vendor-provided software upgrades when
available and completely replacing affected systems when necessary.



                                       24
<PAGE>   25

    The total costs to implement the plan, which costs include the already
planned replacement of existing systems to support our overall growth, are
estimated to be well less than one percent of 1998 revenues. Approximately 70%
of the estimated costs to implement the plan have been incurred to date and the
remaining costs are expected to be incurred in the remainder of 1999. All costs,
including the cost of internal personnel, outside consultants, system
replacements and other equipment, will be expensed as incurred, except for
long-lived assets, which will be capitalized in accordance with our
capitalization policies. We have not postponed the implementation or upgrade of
other systems as a result of focusing on the Year 2000 plan.

    As part of the plan, formal communication with our suppliers, customers and
other service providers has been initiated. To date, however, we have not
determined whether "Year 2000" issues affecting key suppliers, significant
customers (including the U.S. government), or critical service providers will
materially impact our cash flows or operating results. A "reasonably likely
worst case" scenario of the Year 2000 issue for Orbital could include: isolated
performance problems with engineering, financial and administrative systems;
isolated interruption of deliveries from critical suppliers; product liability
or warranty issues; and the temporary inability of key customers to pay amounts
due to Orbital. Contingency plans are being prepared, and will be implemented if
necessary, including having sufficient liquidity available to sustain a
temporary interruption of cash receipts during early 2000 and the identification
of alternative suppliers for critical components. There can be no assurance that
we have identified, or will identify, all "Year 2000" affected systems,
suppliers, customers and service providers, or that our corrective action plan
will be timely and successful.


                        OUTLOOK: ISSUES AND UNCERTAINTIES

    The Private Securities Litigation Reform Act of 1995 provides a safe harbor,
in certain circumstances, for forward-looking statements made by or on behalf of
Orbital. Orbital and its representatives may from time to time make written or
verbal forward-looking statements, including statements contained in our filings
with the SEC and in the report to stockholders. All statements that address
operating performance, events or developments that we expect or anticipate will
occur in the future, including statements relating to our sales and earnings
growth, statements expressing general optimism about future operating results,
statements relating to our belief about the outcome of pending litigation, and
statements relating to our achievement of Year 2000 readiness are
forward-looking statements within the meaning of the Act. The forward-looking
statements are and will be based on management's then-current views and
assumptions regarding future events and operating performance.

    The following are some of the factors that could cause actual results to
differ materially from information contained in our forward-looking statements:

    Most of the products we and our affiliates develop and manufacture are
technologically advanced and sometimes novel systems that must function under
demanding operating conditions and are subject to significant technological
change and innovation. We have occasionally experienced product failures or
other operational problems. In addition to any costs resulting from product
warranties or required remedial action, product failures may result in increased
costs or loss of revenues due to postponement or cancellation of subsequently
scheduled operations or product deliveries.

    Our financial performance generally, as well as the recoverability of our
investments in ORBCOMM, ORBIMAGE and CCI and any other company in which we make
a strategic investment, and investments that we make in the development of new
technologies for new products or existing product enhancements, depend on
several factors including, among other things, the successful and timely funding
and implementation of innovative and novel technologies involving complex
systems in a cost-effective manner, the establishment and expansion of
commercial markets and customer acceptance, competition and such entities'
ability to raise necessary capital. If we conclude at any time that our
investments are not recoverable, we may be required to write off part or all of
such investments.

    Historically, we have made strategic acquisitions of businesses, and we
routinely evaluate potential acquisition candidates that we believe would
enhance our business. We have also historically pursued strategic alliances
through joint ventures, and we routinely evaluate similar opportunities. Such
transactions commonly involve certain risks including, among others,
assimilating the acquired operations, technologies and personnel and maintaining


                                       25
<PAGE>   26

appropriate standards, controls, procedures and policies, entering markets in
which we have little or no direct prior experience, potentially losing key
employees of acquired organizations, the diversion of management attention from
other ongoing business concerns and resolving potential disputes with joint
venture partners.

    At December 31, 1998, approximately 41% of our total firm contract backlog
was derived from contracts with the U.S. government and its agencies or from
subcontracts with prime contractors to the U.S. government. Most of our
government contracts are funded incrementally on a year-to-year basis. Changes
in government policies, priorities or funding levels through agency or program
budget reductions by the U.S. Congress or executive agencies could materially
adversely affect our financial condition or results of operations. Furthermore,
contracts with the U.S. government may be terminated or suspended by the U.S.
government at any time, with or without cause. Such contract suspensions or
terminations could result in unreimbursable expenses or charges or otherwise
adversely affect our business.

    The accuracy and appropriateness of our direct and indirect costs and
expenses under our contracts with the U.S. government are subject to extensive
regulation and audit by the Defense Contract Audit Agency or by other
appropriate agencies of the U.S. government. These agencies have the right to
challenge our cost estimates or allocations with respect to any such contract. A
substantial portion of payments to us under U.S. government contracts are
provisional payments that are subject to potential adjustment upon audit by such
agencies.

    The majority of our contracts, particularly for our space and ground
infrastructure systems, are long-term contracts. We recognize revenues on
long-term contracts using the percentage of completion method of accounting,
whereby revenue, and therefore profit, is recognized based on actual costs
incurred in relation to total estimated costs to complete the contract or based
on specific delivery terms and conditions. Revenue recognition and
profitability, if any, from a particular contract may be adversely affected to
the extent that original cost estimates, estimated costs to complete or
incentive or award fee estimates are revised, delivery schedules are delayed, or
progress under a contract is otherwise impeded.

    The costs and other effects of pending or possible litigation or
governmental investigations could have an adverse effect on our business and
could divert the attention of management from ongoing business matters.

    Virtually all our products and services face significant competition from
existing competitors, many of whom are larger and have substantially greater
resources than we do. Furthermore, the possibility exists that other domestic or
foreign companies or governments will seek to produce products or services that
compete with our products or services. A foreign competitor could benefit from
subsidies from, or other protective measures by, its home country.

ITEM 7A.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

    The Company does not have any material exposure to interest rate changes,
commodity price changes, foreign currency fluctuations, or similar market risks,
although it does enter into forward exchange contracts to hedge against specific
foreign currency fluctuations, principally with respect to the Canadian dollar.



                                       26
<PAGE>   27


ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

                          INDEX TO FINANCIAL STATEMENTS

                                                                            PAGE
              Independent Auditors' Report..................................  28
              Consolidated Statements of Operations.........................  29
              Consolidated Balance Sheets...................................  30
              Consolidated Statements of Stockholders' Equity...............  31
              Consolidated Statements of Cash Flows.........................  32
              Notes to Consolidated Financial Statements....................  33















                                       27
<PAGE>   28
                          INDEPENDENT AUDITORS' REPORT

The Board of Directors and Stockholders
Orbital Sciences Corporation:

    We have audited the accompanying consolidated balance sheets of Orbital
Sciences Corporation and subsidiaries as of December 31, 1998 and 1997, and the
related consolidated statements of operations, stockholders' equity, and cash
flows for each of the years in the three-year period ended December 31, 1998.
These consolidated financial statements are the responsibility of the Company's
management. Our responsibility is to express an opinion on these consolidated
financial statements based on our audits.

    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

    In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the financial position of Orbital
Sciences Corporation and subsidiaries as of December 31, 1998 and 1997, and the
results of their operations and their cash flows for each of the years in the
three-year period ended December 31, 1998, in conformity with generally accepted
accounting principles.

    As discussed in note 1A, the accompanying consolidated balance sheets as of
December 31, 1998 and 1997, and the consolidated statements of operations,
stockholders' equity and cash flows for each of the years in the three-year
period ended December 31, 1998 have been restated.

                                    KPMG LLP

Washington, D.C.
February 16, 1999, except as to note 13,
  which is as of March 18, 1999, and
  note 1A, which is as of April 17, 2000


                                       28

<PAGE>   29



                          ORBITAL SCIENCES CORPORATION
                      CONSOLIDATED STATEMENTS OF OPERATIONS
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                                     FOR THE YEAR ENDED
                                                                         DECEMBER 31,
                                                              1998           1997          1996
                                                              ----           ----          ----
                                                           (RESTATED)     (RESTATED)    (RESTATED)
<S>                                                      <C>          <C>             <C>
REVENUES                                                 $   730,662  $    546,008    $   449,787

COSTS OF GOODS SOLD                                          549,628       413,361        332,581
                                                         -----------  ------------    -----------
GROSS PROFIT                                                 181,034       132,647        117,206

RESEARCH AND DEVELOPMENT EXPENSES                             49,384        33,140         23,068
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES                 106,812        88,148         77,247
AMORTIZATION OF GOODWILL                                       9,713         3,852          3,134
ASSET IMPAIRMENT CHARGES                                       2,479            --             --
                                                         -----------  ------------    -----------
INCOME FROM OPERATIONS                                        12,646         7,507         13,757

NET INVESTMENT INCOME (EXPENSE), (NET OF INTEREST
  EXPENSE OF $8,886, $2,894 AND $1,412, RESPECTIVELY)         (1,279)         (990)           (49)
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES                    (76,815)      (25,094)        (7,008)
NON-CONTROLLING INTERESTS IN (EARNINGS) LOSSES
  OF CONSOLIDATED SUBSIDIARIES                                14,112         2,638          1,473
GAIN ON ISSUANCE OF SUBSIDIARY EQUITY                             --        21,810             --
ACQUISITION EXPENSES                                              --        (4,343)            --
                                                         -----------  ------------    -----------
INCOME (LOSS) BEFORE PROVISION FOR INCOME TAXES              (51,336)        1,528          8,173

PROVISION FOR INCOME TAXES                                     5,216        12,933            211
                                                         -----------  ------------    -----------
INCOME (LOSS) BEFORE EXTRAORDINARY ITEM                      (56,552)      (11,405)         7,962

EXTRAORDINARY ITEM - GAIN ON SALE OF
  ASSETS, NET OF TAX                                              --            --          1,980
                                                         -----------  ------------    -----------
NET INCOME (LOSS)                                        $   (56,552) $    (11,405)   $     9,942
                                                         ===========  ============    ===========

NET INCOME (LOSS) PER COMMON SHARE:

BEFORE EXTRAORDINARY ITEM                                $     (1.59) $      (0.35)   $      0.27
EXTRAORDINARY ITEM - GAIN ON SALE OF ASSETS,
  NET OF TAX                                                      --            --           0.07
                                                         -----------  ------------    -----------
                                                         $     (1.59) $      (0.35)   $      0.34
                                                         ===========  ============    ===========
SHARES USED IN COMPUTING NET INCOME (LOSS) PER SHARE      35,624,888    32,283,138     29,137,361
                                                         ===========  ============    ===========


NET INCOME (LOSS) PER COMMON SHARE, ASSUMING DILUTION:

BEFORE EXTRAORDINARY ITEM                                $     (1.59) $      (0.35)   $      0.30
EXTRAORDINARY ITEM - GAIN ON SALE OF ASSETS,
  NET OF TAX                                                      --            --           0.04
                                                         -----------  ------------    -----------
                                                         $     (1.59) $      (0.35)   $      0.34
                                                         ===========  ============    ===========
SHARES USED IN COMPUTING NET INCOME (LOSS)
  PER COMMON SHARE, ASSUMING DILUTION                     35,624,888    32,283,138     31,616,119
                                                         ===========  ============    ===========
</TABLE>



          SEE ACCOMPANYING NOTES TO CONSOLIDATED FINANCIAL STATEMENTS.

<PAGE>   30


                         ORBITAL SCIENCES CORPORATION
                          CONSOLIDATED BALANCE SHEETS
                       (IN THOUSANDS, EXCEPT SHARE DATA)


<TABLE>
<CAPTION>
                                        ASSETS
                                        ------                                            DECEMBER 31,   DECEMBER 31,
                                                                                              1998          1997
                                                                                           (RESTATED)    (RESTATED)
                                                                                          ------------  ------------
<S>                                                                                       <C>           <C>
CURRENT ASSETS:
     Cash and cash equivalents                                                             $  15,268       $   6,391
     Short-term investments, at market                                                         7,922           8,735
     Receivables, net                                                                        215,110         206,417
     Inventories, net                                                                         58,141          59,239
     Deferred income taxes and other current assets                                            7,686           5,889
                                                                                           ---------       ---------
          TOTAL CURRENT ASSETS                                                               304,127         286,671
PROPERTY, PLANT AND EQUIPMENT, AT COST, LESS ACCUMULATED
  depreciation and amortization of $99,839 and $79,253, respectively                         139,401         125,327

INVESTMENTS IN AND ADVANCES TO AFFILIATES, NET                                               199,267         130,402

GOODWILL,   less accumulated amortization of $28,744 and $19,794, respectively               227,351         207,523

DEFERRED INCOME TAXES AND OTHER ASSETS                                                        25,046          27,962
                                                                                           ---------       ---------
               TOTAL ASSETS                                                                $ 895,192       $ 777,885
                                                                                           =========       =========
                       LIABILITIES AND STOCKHOLDERS' EQUITY
                       ------------------------------------

CURRENT LIABILITIES:
     Short-term borrowings and current portion of
       long-term obligations                                                               $  26,814       $  29,767
     Accounts payable                                                                         39,095          36,218
     Accrued expenses                                                                        108,488          98,018
     Deferred revenues                                                                        76,678          69,467
                                                                                           ---------       ---------
          TOTAL CURRENT LIABILITIES                                                          251,075         233,470

DUE TO JOINT VENTURE PARTNER                                                                  26,829              --

LONG-TERM OBLIGATIONS, NET OF CURRENT PORTION                                                181,281         200,194

OTHER LIABILITIES                                                                              3,007           2,443
                                                                                           ---------       ---------
          TOTAL LIABILITIES                                                                  462,192         436,107

NON-CONTROLLING INTERESTS IN
  NET ASSETS OF CONSOLIDATED SUBSIDIARIES                                                     13,648          27,794

COMMITMENTS AND CONTINGENCIES

STOCKHOLDERS' EQUITY:
     Preferred Stock, par value $.01; 10,000,000 shares authorized:
       none outstanding                                                                           --              --
     Common Stock, par value $.01, 80,000,000 shares authorized,
       37,018,256 and 32,481,719 shares outstanding, respectively
        after deducting 20,877 shares held in treasury                                           370             325
     Additional paid-in capital                                                              490,540         326,187
     Accumulated other comprehensive loss                                                     (7,149)         (4,671)
     Accumulated deficit                                                                     (64,409)         (7,857)
                                                                                           ---------       ---------
          TOTAL STOCKHOLDERS' EQUITY                                                         419,352         313,984
                                                                                           ---------       ---------
               TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY                                  $ 895,192       $ 777,885
                                                                                           =========       =========
</TABLE>



          SEE ACCOMPANYING NOTES TO CONSOLIDATED FINANCIAL STATEMENTS.

<PAGE>   31

                           ORBITAL SCIENCES CORPORATION
           CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY
                        (IN THOUSANDS, EXCEPT SHARE DATA)




<TABLE>
<CAPTION>
                                                                                         ACCUMULATED
                                                                                            OTHER        RETAINED
                                                       COMMON STOCK       ADDITIONAL    COMPREHENSIVE    EARNINGS
                                                     SHARES     AMOUNT  PAID-IN-CAPITAL    INCOME        (DEFICIT)          TOTAL
                                                     ------     ------  ---------------    ------        ---------          -----
<S>                                                <C>          <C>     <C>             <C>             <C>              <C>
BALANCE, DECEMBER 31, 1995 (RESTATED)              26,766,029   $ 268      $ 247,580      $ (3,288)     $ (6,394)        $ 238,166

  Conversion of convertible debentures              3,895,653      39         53,598             -             -            53,637
  Shares issued in private offering                 1,200,000      12         20,251             -             -            20,263
  Shares issued to employees and directors            298,916       3          2,163             -             -             2,166
  Comprehensive income (loss):
   Net income (loss)                                        -       -              -             -         9,942             9,942
   Translation adjustment                                   -       -              -          (325)            -              (325)
   Unrealized losses on short-term investments              -       -              -           (54)            -               (54)
                                                                                                                        ----------
                Total comprehensive income                                                                                   9,563
                                                   ----------   -----      ---------      --------      --------         ---------

BALANCE, DECEMBER 31, 1996 (RESTATED)              32,160,598     322        323,592        (3,667)        3,548           323,795

  Shares issued to employees and directors            321,121       3          2,595             -             -             2,598
  Comprehensive income:
   Net income (loss)                                        -       -              -             -       (11,405)          (11,405)
  Translation adjustment                                    -       -              -        (1,262)            -            (1,262)
  Unrealized gains on short-term investments                -       -              -           258             -               258
                                                                                                                         ---------
       Total comprehensive income (loss)                                                                                   (12,409)
                                                   ----------   -----      ---------      --------      --------         ---------
BALANCE, DECEMBER 31, 1997 (RESTATED)              32,481,719     325        326,187        (4,671)       (7,857)          313,984

  Shares issued in equity offering                  3,450,000      34        150,118             -             -           150,152
  Shares issued to employees and directors          1,086,537      11         14,235             -             -            14,246
  Comprehensive income:
   Net income (loss)                                        -       -              -             -       (56,552)          (56,552)
   Translation adjustment                                   -       -              -        (2,282)            -            (2,282)
   Unrealized losses on short-term investments              -       -              -          (196)            -              (196)
                                                                                                                         ---------
       Total comprehensive income (loss)                                                                                   (59,030)
                                                   ----------   -----      ---------      --------      --------         ---------
BALANCE, DECEMBER 31, 1998 (RESTATED)              37,018,256   $ 370      $ 490,540      $ (7,149)     $(64,409)        $ 419,352
                                                   ==========   =====      =========      ========      ========         =========
</TABLE>

          SEE ACCOMPANYING NOTES TO CONSOLIDATED FINANCIAL STATEMENTS.



<PAGE>   32



                          ORBITAL SCIENCES CORPORATION
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)


<TABLE>
<CAPTION>
                                                                                   FOR THE YEAR ENDED
                                                                                       DECEMBER 31,
                                                                             ----------------------------------------------
                                                                                 1998              1997           1996
                                                                             -------------     -------------  -------------
CASH FLOWS FROM OPERATING ACTIVITIES:                                          (RESTATED)       (RESTATED)      (RESTATED)
<S>                                                                          <C>               <C>            <C>
  NET INCOME (LOSS)                                                           $  (56,552)         $(11,405)         9,942
  ADJUSTMENTS TO RECONCILE NET INCOME (LOSS) TO NET CASH
     PROVIDED BY (USED IN) OPERATING ACTIVITIES:
       Depreciation and amortization expense                                      31,272            24,553         25,096
       Equity in losses of affiliates                                             76,815            25,094          7,008
       Non-controlling interests in losses of consolidated subsidiaries          (14,112)           (2,638)        (1,473)
       (Gain) loss on issuance of subsidiary stock and sale of fixed assets
         and investments                                                            (576)          (21,810)           226
       Deferred income taxes                                                       3,822            11,650             --

     CHANGES IN ASSETS AND LIABILITIES:
       (Increase) decrease in receivables, net                                   (27,015)          (16,863)       (27,712)
       (Increase) decrease in inventories, net                                     3,362           (26,602)        10,261
       (Increase) decrease in other assets                                        (9,002)           (7,903)         2,085
       Decrease in accounts payable and accrued expenses                           8,946           (17,144)        (9,318)
       Increase (decrease) in deferred revenue                                   (15,347)           35,338          1,360
       Increase (decrease) in other liabilities                                   (1,305)          (13,151)        (2,954)
                                                                             -------------     -------------  -------------
       NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES                           308           (20,881)        14,521
                                                                             -------------     -------------  -------------


CASH FLOWS FROM INVESTING ACTIVITIES:
  Capital expenditures                                                           (36,294)          (37,200)       (39,844)
  Proceeds from sales of fixed assets                                                 --            34,682          9,518
  Payments for business combinations, net of cash acquired                       (22,751)          (66,558)            --
  Purchases of available-for-sale investment securities                           (2,500)          (25,328)        (5,623)
  Sales of available-for-sale investment securities                                   --            22,209         11,041
  Maturities of available-for-sale investment securities                           2,409             6,631          8,220
  Investments in and advances to affiliates                                     (101,700)          (75,564)       (23,458)
                                                                             -------------     -------------  -------------
       NET CASH USED IN INVESTING ACTIVITIES                                    (160,836)         (141,128)       (40,146)
                                                                             -------------     -------------  -------------


CASH FLOWS FROM FINANCING ACTIVITIES:
  Short-term borrowings, net of (repayments)                                       1,940            (3,700)        26,200
  Principal payments on long-term obligations                                    (79,556)          (20,237)        (7,502)
  Net proceeds from issuance of long-term obligations                             63,000           163,078             --
  Fees associated with conversion of debentures                                       --                --         (2,571)
  Net proceeds from issuances of common stock                                    164,398             2,598         22,429
  Advances from joint venture partner                                             21,829                --             --
                                                                             -------------     -------------  -------------
       NET CASH PROVIDED BY FINANCING ACTIVITIES                                 171,611           141,739         38,556
                                                                             -------------     -------------  -------------

EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS                      (2,206)           (1,262)          (325)
                                                                             -------------     -------------  -------------
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                               8,877           (21,532)        12,606


CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD                                     6,391            27,923         15,317
                                                                             -------------     -------------  -------------
CASH AND CASH EQUIVALENTS, END OF PERIOD                                      $   15,268        $    6,391     $   27,923
                                                                             =============     =============  =============
</TABLE>

         SEE ACCOMPANYING NOTES TO CONSOLIDATED FINANCIAL STATEMENTS.

<PAGE>   33



                          ORBITAL SCIENCES CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    Orbital Sciences Corporation (together with its subsidiaries, "Orbital" or
the "company"), a Delaware corporation, is a leading space and information
systems company that designs, manufactures, operates and markets a broad range
of space-related products and services that are grouped into three sectors:
space and ground infrastructure systems, satellite access products and satellite
services. Space and ground infrastructure systems include launch vehicles,
satellites and related space systems, electronics and sensor systems, and
satellite ground systems and software. Satellite access products include
satellite-based navigation, positioning and communications products and
transportation management systems. Satellite services include satellite-based
two-way mobile data communications, satellite-based remote imaging and
satellite-based voice communications services. Disaggregated financial
information is presented in note 2.

PRINCIPLES OF CONSOLIDATION

    The consolidated financial statements include the accounts of Orbital, all
wholly and partially owned subsidiaries controlled by Orbital, and partnerships
in which Orbital directly or indirectly controls the general partner interests.
The consolidated financial statements do not include the accounts of affiliates
that the company does not control, including ORBCOMM, ORBIMAGE and CCI. All
material transactions and accounts among consolidated entities have been
eliminated in consolidation.

PREPARATION OF CONSOLIDATED FINANCIAL STATEMENTS

    The preparation of consolidated financial statements, in conformity with
generally accepted accounting principles, requires management to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the consolidated
financial statements and the reported amounts of revenues and expenses during
the reporting period. Management periodically assesses and evaluates the
sufficiency and/or deficiency of estimated liabilities recorded for various
programmatic risks and uncertainties. Actual results could differ from these
estimates.

    Certain reclassifications have been made to the 1997 and 1996 financial
statements to conform to the 1998 financial statement presentation. All
financial amounts are stated in U.S. dollars unless otherwise indicated.

REVENUE RECOGNITION

    Orbital recognizes revenues on long-term contracts using the
percentage-of-completion method of accounting. Accordingly, (i) revenues on
cost-plus-fee contracts are recognized to the extent of costs incurred plus a
proportionate amount of fee earned, and (ii) revenues on fixed-price contracts
are recognized based on costs incurred in relation to total estimated costs, or
based on specific delivery terms and conditions. To the extent that estimated
costs of completion are adjusted, revenue and profit recognized from a
particular contract will be affected in the period of the adjustment.
Anticipated contract losses are recognized as they become known. Fees under
certain long-term contracts may be increased or decreased in accordance with
cost or performance incentive provisions that measure actual performance against
actual targets or other criteria. Such incentive fee awards or penalties are
included in revenues at the time the amounts can be determined reasonably.
Revenues from sales of satellite access products and satellite services are
generally recognized when the product is shipped or the service is performed.



                                       33



<PAGE>   34

COMPREHENSIVE INCOME (LOSS)

     The company's comprehensive income (loss) is presented in the consolidated
statements of stockholders' equity. Other comprehensive income (loss) consists
primarily of foreign currency translation adjustments and unrealized gains and
losses on available-for-sale securities.

FOREIGN CURRENCY

    Orbital's operating entities conduct business in a number of countries and
deal in a number of foreign currencies. The financial results of foreign
operations are translated into U.S. dollars using year-end exchange rates for
assets and liabilities and using weighted average exchange rates for revenues,
expenses, gains and losses.

    Translation gains and losses relating to foreign operations that are
self-contained and integrated within a particular country or economic
environment, and therefore are not dependent on the U.S. dollar, are recognized
as a separate component of stockholders' equity until there is a realized
reduction in Orbital's net investment in the foreign operation. Translation
losses in 1998, 1997 and 1996 were approximately $2,282,000, $1,262,000 and
$325,000, respectively. Transaction gains and losses relating to foreign
operations that are a direct and integral component or extension of Orbital's
domestic operations, and therefore are dependent on the U.S. dollar, are
reported currently as a component of net income.

    Orbital enters into forward exchange contracts to hedge against foreign
currency fluctuations on certain receivables and payables. Gains and losses on
contracts to hedge specific foreign currency commitments are deferred and
accounted for as part of the underlying transaction.

RESEARCH AND DEVELOPMENT

    Research and development expenses include self-funded product development
activities and exclude direct customer-funded development and are expensed as
incurred. Research and development expenses are allocated, when appropriate, to
U.S. government contracts under government-mandated cost accounting standards.

DEPRECIATION, AMORTIZATION AND RECOVERABILITY OF LONG-LIVED ASSETS

    Depreciation and amortization are provided using the straight-line method as
follows:

                    Buildings.........................  18 to 20 years
                    Machinery, equipment, software
                      and intellectual property.......  3 to 10 years
                    Satellite systems.................  5 to 7 years
                                                        Shorter of estimated
                                                        useful life or lease
                    Leasehold improvements............  term

    Orbital's policy is to review its long-lived assets, including excess of
purchase price over net assets acquired, investments in and advances to
affiliates, and specialized equipment used to support specific space-related
products, for impairment whenever events or changes in circumstances indicate
that the carrying amount of an asset may not be recoverable. The company
recognizes an impairment loss when the sum of expected future cash flows is less
than the carrying amount of the asset. Given the inherent technical and
commercial risks within the space industry, it is possible that the company's
current expectation that it will recover the carrying amount of its long-lived
assets from future operations may change.

INCOME TAXES

    The company recognizes income taxes using the asset and liability method.
Under the asset and liability method, deferred tax assets and liabilities are
recognized for the future tax consequences attributable to differences between
the financial statement carrying amounts of existing assets and liabilities and
their respective tax bases. Deferred tax assets and liabilities are measured
using enacted tax rates expected to apply to taxable income in the years in
which


                                       34




<PAGE>   35

those temporary differences are expected to be recovered or settled. The effect
of a tax rate change on deferred tax assets and liabilities is recognized in
income in the period that includes the enactment date.

STOCK-BASED COMPENSATION

    On January 1, 1996, the company adopted Statement of Financial Accounting
Standards No. 123, "Accounting for Stock-Based Compensation" ("SFAS 123"), which
requires companies to (i) recognize as expense the fair value of all stock-based
awards on the date of grant, or (ii) continue to apply the provisions of
Accounting Principles Board Opinion No. 25, "Accounting for Stock Issues to
Employees" ("APB 25") and provide pro forma net income and pro forma earnings
per share disclosures for employee stock option grants as if the
fair-value-based method defined in SFAS 123 had been applied. The company has
elected to continue to apply the provisions of APB 25 and provide the pro forma
disclosure in accordance with the provisions of SFAS 123.

EARNINGS PER SHARE

    The company adopted Statement of Financial Accounting Standards No. 128,
"Earnings Per Share" ("SFAS 128"), in the fourth quarter of 1997. SFAS 128
requires companies to present basic earnings per share and diluted earnings per
share, instead of the primary and fully diluted earnings per share that had
previously been required. Net income (loss) per common share is calculated using
the weighted average number of common shares outstanding during the periods. Net
income (loss) per common share assuming dilution is calculated using the
weighted average number of common shares and dilutive common equivalent shares
outstanding during the periods, plus the effects of an assumed conversion of the
company's convertible notes, after giving effect to all net income adjustments
that would result from the assumed conversion.

CASH AND INVESTMENTS

    Orbital considers all highly liquid investments with original maturities of
three months or less to be cash equivalents. Investments in securities that do
not meet the definition of cash equivalents are classified as short-term
investments. Since Orbital does not intend to hold its investments in debt and
equity securities until maturity and does not actively trade the securities to
maximize trading gains, Orbital classifies these securities as
"available-for-sale" and, accordingly, reports such securities at fair value
plus accrued interest. Any temporary excess (deficiency) of market value over
(under) the underlying cost of the short-term investment is excluded from
current period earnings and is reported as unrealized gains (losses) as a
separate component of stockholders' equity. In addition, at December 31, 1998
and 1997, the company had approximately $7,757,000 and $6,162,000, respectively,
of cash and short-term investments restricted to support outstanding letters of
credit.

INVENTORIES

    Inventories consist of components and raw materials inventory,
work-in-process inventory and finished goods inventory and are generally stated
at the lower of cost or net realizable value on a first-in, first-out ("FIFO")
or specific identification basis. Components and raw materials are purchased to
support future production efforts. Work-in-process inventory consists primarily
of (i) costs incurred under long-term fixed-price contracts accounted for using
the percentage-of-completion method of accounting applied on a units of delivery
basis, and (ii) partially assembled commercial products, and generally includes
direct production costs and certain allocated indirect costs (including an
allocation of general and administrative costs). Finished goods inventory
consists of fully assembled commercial products awaiting shipment.

SELF-CONSTRUCTED ASSETS AND INTERNALLY DEVELOPED SOFTWARE

    The company self-constructs much of its ground and airborne support and
special test equipment used in the manufacture, production and delivery of many
of its space infrastructure products. Orbital capitalizes certain costs incurred
in constructing ground and airborne support and special test equipment and
satellite systems. Capitalized costs generally include direct construction costs
and certain allocated indirect costs, and exclude general and administrative and
research and development costs.


                                       35



<PAGE>   36

      Orbital, pursuant to the requirements of the Financial Accounting
Standards Board's Statement of Financial Accounting Standards No. 86, "Software
Development Costs" ("SFAS 86"), capitalizes certain costs of developing product
software once technological feasibility has been established. Capitalized costs
generally include direct software coding costs and certain allocated indirect
costs, and exclude general and administrative and research and development
costs.

INVESTMENTS IN AND ADVANCES TO AFFILIATES

    The company uses the equity method of accounting for its investments in and
advances to affiliates in which the company has the ability to significantly
influence, but not control, the affiliates' operations. In accordance with the
equity method of accounting, the company's carrying amount of an investment in
an affiliate is initially recorded at cost and is increased to reflect its
proportionate share of the affiliate's income and is reduced to reflect its
proportionate share of the affiliate's losses based on the company's common
stock or partnership interest, including all preferred dividends to other
investors in such entities. For those investments for which Orbital has provided
substantially all of the investee's funding, the company uses a modified equity
method of accounting whereby 100% of the investee's current period losses are
recognized. Further, Orbital does not recognize revenues on sales to investees
for which Orbital has provided substantially all such investees' funding.
Orbital's investment is also increased to reflect contributions to, and
decreased to reflect distributions received from, the affiliate. Any excess of
the amount of Orbital's investment over the amount of the underlying equity in
each affiliate's net assets is amortized in a manner similar to goodwill. The
company capitalizes interest costs on equity method investments when an
affiliate has significant assets under construction and has not yet commenced
principal operations. During 1998, 1997, and 1996, the company capitalized
interest on investments in and advances to affiliates of $9,555,000, $6,828,000,
and $6,890,000, respectively. The company uses the cost method of accounting for
investments in which it has no significant influence.

GOODWILL

    The company amortizes the excess of purchase price over net assets acquired
related to prior business combinations on a straight-line basis over its
estimated useful life, generally 10-40 years. Orbital periodically assesses and
evaluates the recoverability of such assets based on current facts and
circumstances and the operational performance of the acquired businesses.

ISSUANCES OF SUBSIDIARY EQUITY

    At times, the company may divest a portion or all of its ownership in its
subsidiaries through the issuance of additional subsidiary equity. The company
recognizes the difference between the carrying amount of its interest in the
subsidiary equity sold and the fair market value of the equity as a gain or loss
upon divestiture or issuance when the company believes the realization of the
gain or loss is assured. The company recognized a gain on issuance of subsidiary
equity of $21,810,000 in 1997 related to the issuance of additional equity by
the company's majority owned subsidiary, Magellan Corporation ("Magellan").

WARRANTIES

    The company occasionally accepts warranty clauses in its commercial and
government contracts. In the event the company does not purchase insurance
coverage to protect itself in connection with such warranty clauses, the company
records a liability for warranty claims when it determines that a specific
material liability exists. The company at times provides limited warranties on
certain commercial products and accrues an estimate of expected warranty costs
based on historical experience.

NEW ACCOUNTING PRONOUNCEMENTS

    In 1998, the Financial Accounting Standards Board adopted Statement of
Financial Accounting Standards No. 133, "Accounting for Derivative Instruments
and Hedging Activities" ("SFAS 133"). SFAS 133 becomes effective June 15, 1999
and will require the company to disclose additional information on its hedging
activities.



                                       36





<PAGE>   37

    Also in 1998, the Accounting Standards Executive Committee issued Statement
of Position 98-5, "Reporting on the Costs of Start-Up Activities" ("SOP 98-5").
Initial application by the company of SOP 98-5 was as of January 1, 1998. This
SOP requires costs of start-up activities and organization costs to be expensed
as incurred. SOP 98-5 also amended certain sections of Statement of Position
81-1, "Accounting for Performance of Construction-Type and Certain
Production-Type Contracts" ("SOP 81-1"), which addresses revenue recognition on
long-term contracts using the percentage-of-completion method of accounting. The
impact of adopting SOP 98-5 in 1998 was not significant.

1A RESTATEMENT MATTERS

Management has determined to restate its previously issued consolidated
financial statements as of and for the years ended December 31, 1998, 1997,
1996 and 1995 with respect to its accounting treatment for the matters
described below. The following table summarizes the various adjustments by
financial statement line items for 1998 and 1997. See subparagraphs (d), (f)
and (g) for a discussion of 1996 and 1995 restatement impacts. The 1996
restatement impact reduced reported net income by $5,965,000. The impact of
these and other matters on the unaudited interim financial results for 1998 and
1997 are summarized in Note 12.


                                       37



<PAGE>   38
                         ORBITAL SCIENCES CORPORATION
          NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (Continued)



<TABLE>
<CAPTION>
                                                                            Consolidated Statements of Operations
                                                                            (In thousands, except per share data)
                                                                               For the Year Ended December 31,
                                                                     ------------------------------------------------------------
                                                                                            1998
                                                                     ------------------------------------------------------------
                                                                          As
                                                                      Previously
                                                                       Reported             Adjustments                Restated
<S>                                                                  <C>                  <C>                           <C>
REVENUES                                                               $734,277             $ (3,615) (c)(g)             $730,662
COSTS OF GOODS SOLD                                                     546,721                2,907  (c)(g)(h)(j)        549,628
RESEARCH AND DEVELOPMENT EXPENSES                                        44,597                4,787  (g)                  49,384
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES                            109,727               (2,915) (g)(h)              106,812
GOODWILL AMORTIZATION                                                     7,939                1,774  (i)                   9,713
ASSET IMPAIRMENT CHARGES                                                     --                2,479  (k)                   2,479
NET INVESTMENT INCOME (EXPENSE)                                           2,567               (3,846) (d)(k)               (1,279)
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES                               (45,092)             (31,723) (a)(c)(e)(f)(g)      (76,815)
NON-CONTROLLING INTERESTS IN (EARNINGS) LOSSES OF CONSOLIDATED
SUBSIDIARIES                                                             10,610                3,502  (h)(i)               14,112
GAIN ON ISSUANCE OF SUBSIDIARY EQUITY                                     4,793               (4,793) (b)                      --
PROVISION FOR INCOME TAXES                                                4,543                  673  (j)                   5,216
NET LOSS                                                                 (6,372)                                          (56,552)
NET LOSS PER COMMON SHARE, BASIC AND ASSUMING DILUTION                    (0.18)                                            (1.59)

<CAPTION>
                                                                               For the Year Ended December 31,
                                                                     ----------------------------------------------------------
                                                                                            1997
                                                                     ----------------------------------------------------------
                                                                         As
                                                                     Previously
                                                                      Reported              Adjustments               Restated
<S>                                                                  <C>                   <C>                       <C>
REVENUES                                                               $605,975             $(59,967) (c)(g)          $546,008
COSTS OF GOODS SOLD                                                     456,772              (43,411) (c)(g)           413,361
RESEARCH AND DEVELOPMENT EXPENSES                                        26,355                6,785  (g)               33,140
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES                             89,502               (1,354) (c)               88,148
GOODWILL AMORTIZATION                                                     3,852                                          3,852
NET INVESTMENT INCOME (EXPENSE)                                           1,475               (2,465) (d)                 (990)
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES                               (26,034)                (940) (a)(c)(e)(f)     (25,094)
NON-CONTROLLING INTERESTS IN (EARNINGS) LOSSES OF CONSOLIDATED            2,638                                          2,638
SUBSIDIARIES
GAIN ON ISSUANCE OF SUBSIDIARY EQUITY                                    21,810                                       21,810
ACQUISITION EXPENSES                                                     (4,343)                  --                  (4,343)
PROVISION FOR INCOME TAXES                                                2,035               10,898  (c)             12,933
NET INCOME (LOSS)                                                        23,005                                      (11,405)
NET INCOME (LOSS) PER COMMON SHARE, BASIC AND ASSUMING DILUTION            0.71                                        (0.35)
</TABLE>



<TABLE>
<CAPTION>
                                                                                  CONSOLIDATED BALANCE SHEETS
                                                                                        (In thousands)


                                                              December 31, 1998                                    December 31, 1998
                                                            As previously reported     Adjustments                    As restated
                                                            ----------------------    -------------                -----------------
<S>                                                         <C>                       <C>                              <C>
Receivables, net                                                   $205,409           $   9,701 (c)                     $215,110
Inventories, net                                                     64,710              (6,569)(h)                       58,141
Deferred income taxes and other current assets                        8,252                (566)(j)                        7,686
Property, plant and equipment                                       157,075             (17,674)(d)(g)                   139,401
Investments in and advances to affiliates                           237,589             (38,322)(a)(b)(c)(d)(e)(f)(k)    199,267
Goodwill                                                            228,624              (1,273)(i)                      227,351
Deferred taxes and other assets                                      35,393             (10,347)(c)(j)                    25,046
Deferred revenues                                                    73,987               2,691 (c)(f)                    76,678
Due to joint venture partner                                             --              26,829 (k)                       26,829
Non-controlling interests in consolidated subsidiaries               17,150              (3,502)(h)(i)                    13,648
Accumulated (earnings) deficit                                       26,888             (91,297)                         (64,409)

<CAPTION>
                                                                 December 31, 1997                                 December 31, 1997
                                                            As previously reported        Adjustments                 As restated
                                                            ----------------------       -------------             -----------------
<S>                                                         <C>                          <C>                         <C>
Receivables, net                                                   $180,204                 $ 26,213 (c)                 $206,417
Inventories, net                                                     59,239                       -- (h)                   59,239
Property, plant and equipment                                       137,498                  (12,171)(d)(g)               125,327
Investments in and advances to affiliates                           159,230                  (28,828)(a)(c)(d)(e)(f)      130,402
Accrued Expenses                                                     98,588                     (570)(c)                   98,018
Deferred revenues                                                    46,138                   23,329 (f)                   69,467
Accumulated (earnings) deficit                                       33,260                  (41,117)                      (7,857)
</TABLE>


                                       38

<PAGE>   39


Equity Method Accounting Restatement Adjustments
The company uses the equity method of accounting for its investments in
affiliates' in which the company has the ability to significantly influence,
but not control, such affiliates operations. Accordingly, Orbital uses the
equity method of accounting for its investments in ORBIMAGE, ORBCOMM and CCI.

(a)  As a result of certain participating rights granted to holders of
     convertible preferred stock of ORBIMAGE, Orbital significantly influences,
     but does not control, ORBIMAGE even though it owns substantially all of
     ORBIMAGE's outstanding common stock. The company's prior consolidated
     financial statements reflected the company's application of the equity
     method of accounting as it pertained to ORBIMAGE based on Orbital's
     percentage share of ownership of ORBIMAGE calculated to give effect to the
     assumed conversion of ORBIMAGE's outstanding convertible preferred stock
     into ORBIMAGE common stock. As reflected in its restated consolidated
     financial statements presented herein, the company applies the equity
     method of accounting as it pertains to ORBIMAGE based on its ownership of
     outstanding common stock without giving effect to the assumed conversion of
     ORBIMAGE's outstanding convertible preferred stock. The effect of this
     revision is to increase equity in losses of affiliates in 1998 and 1997 by
     $8,519,000 and $698,000, respectively.

     In the first quarter of 1998, pursuant to rights granted under a 1997
     stock purchase agreement, ORBIMAGE's minority investors acquired 227,295
     shares of ORBIMAGE's convertible preferred stock for total consideration
     of $22,729,500. ORBIMAGE's convertible preferred stock is convertible into
     ORBIMAGE's common stock based on a per common share price that was less
     than the fair value of ORBIMAGE's common stock when the additional
     preferred shares were acquired in 1998. Previously, the company's
     financial statements did not give effect to any beneficial conversion
     discount as an additional net loss allocable to the company pursuant to
     the equity method of accounting. As reflected in the restated consolidated
     financial statements presented herein, Orbital calculates its equity in
     losses of affiliates including the impact of the beneficial conversion.
     The effect of these revisions is to increase equity in losses of
     affiliates in 1998 by $13,695,000.

     ORBIMAGE's preferred stockholders are entitled to receive a cumulative
     dividend, payable either in cash or in additional shares of convertible
     preferred stock. To date all dividends have been paid in additional shares
     of convertible preferred stock. Previously, the company's consolidated
     financial statements did not reflect additional net losses allocable to
     Orbital as a result of ORBIMAGE's declaration of such "in-kind" dividends
     on its convertible preferred stock. As reflected in the restated
     consolidated financial statements presented herein, Orbital calculates its
     equity in losses of affiliates taking into account such non-cash dividends
     at their fair value. The effect of these revisions is to increase equity
     in losses of affiliates in 1998 and 1997 by $7,324,000 and $2,808,000,
     respectively.

(b)  Previously, the company's consolidated financial statements reflected
     recognition of a gain in the second quarter of 1998 arising from ORBIMAGE's
     issuance of warrants to purchase common stock. As reflected in the restated
     consolidated financial statements presented herein, since the warrants have
     not been exercised, the company has revised its accounting for this equity
     issuance, resulting in the elimination of its previously reported gain on
     issuance of affiliate equity by $4,793,000 in 1998.

(c)  Previously, the company's consolidated financial statements reflected the
     recognition of revenue related to the initial transfer of certain assets to
     ORBIMAGE in 1997 and sales under a procurement agreement with CCI in 1998.
     Additionally, the company did not previously reflect an increase in its
     deferred tax asset liabilities related to the ORBIMAGE transaction. As
     reflected in the restated consolidated financial statements presented
     herein, the company has revised its accounting for these transactions and
     the tax impact thereto, eliminating its reported revenues related to these
     sales to CCI of $6,556,000 in 1998, and to ORBIMAGE of $58,539,000 in 1997.
     Operating income was also reduced in 1998 and 1997 by $596,000 and
     14,469,000, respectively. The net impact of the adjustments on equity in
     losses of affiliates was $238,000 in 1998 and $5,122,000 in 1997. Finally,
     the company's provision for income taxes was increased as a result of
     this revision in 1997 by $10,898,000 to reflect deferred tax liabilities
     related to the investment basis differences.

(d)  Previously, the company's consolidated financial statements reflected the
     company's capitalization of interest expense on various assets, including
     on its equity investments in ORBIMAGE, ORBCOMM and CCI. As reflected in the
     restated consolidated financial statements presented herein, Orbital has
     not capitalized interest expense on its investment in ORBIMAGE and has
     revised the capitalization of interest on certain other assets including
     its equity method investments in ORBCOMM and CCI. These revisions include
     the compounding impact of interest, and the reduction of eligible
     investment amounts for losses

                                       39


<PAGE>   40

     recognized for equity method investors. These revisions had the effect of
     increasing (decreasing) interest expense in 1998, 1997 and 1996 by
     $6,204,000, $2,465,000, and $ (952,000), respectively.

(e)  Previously, the company's consolidated financial statements did not reflect
     amortization of the excess of the company's investment in ORBIMAGE over the
     underlying share of the company's equity in ORBIMAGE. As reflected in the
     restated consolidated financial statements presented herein, Orbital is
     amortizing such excess over eight years. This revision had the effect of
     increasing the company's equity in losses of affiliates by approximately
     $355,000 and $237,000 in 1998 and 1997, respectively.

(f)  Previously, the company's consolidated financial statements did not reflect
     the amortization of previously deferred profits in connection with its
     sales of both satellites and ground stations to ORBCOMM. As reflected in
     the restated consolidated financial statements presented herein, Orbital is
     amortizing a portion of such deferred profits over the estimated lives of
     both the satellites and the ground stations.  This revision had the effect
     of increasing the company's equity in losses of affiliates by approximately
     $1,298,000,  $439,000 and $439,000 in 1998, 1997 and 1996, respectively.


Asset Restatement Adjustments
(g)  The company has historically capitalized certain costs associated with
     certain product enhancements, internally developed software and certain
     other costs. Previously, the company's consolidated financial statements
     reflected such costs as capitalized assets. As reflected in the
     restated consolidated financial statements presented herein, the company
     has expensed all previously capitalized enhancement costs and certain other
     non-capitalizable costs. These revisions resulted in an increase in
     research and development expenses and costs of goods sold and an increase
     (decrease) in revenues for 1998 of $4,787,000, $1,708,000 and $2,477,000,
     respectively, for 1997 of $6,785,000, $660,000, and $(1,428,000),
     respectively and for 1996 of $1,338,000, ($204,000) and ($4,791,000),
     respectively. These adjustments also had the impact of decreasing selling,
     general and administrative expenses by $2,631,000 in 1998 and increasing
     equity in losses of affiliates by $770,000 in 1998. This adjustment had
     the impact of increasing accumulated deficit at January 1, 1996 by
     $328,000.

Other Restatement and Reclassification Adjustments
(h)  Previously, the company's consolidated financial statements did not
     reflect a write-down in the book value of inventory at the company's
     Magellan subsidiary related to certain obsolete consumer products. The
     adjustment to record the write-down in inventory as reflected in the
     restated consolidated financial statements presented herein, resulted in
     an increase to costs of goods sold of approximately  $4,670,000, an
     increase in selling, general and administrative expenses of  $324,000 and
     an increase in non-controlling interests of approximately $2,988,000 in
     1998.

(i)  The company had previously amortized a portion of the goodwill arising from
     the acquisition of Ashtech Inc. as a direct charge against non-controlling
     interests. As reflected in the restated consolidated financial statements
     presented herein, the company is amortizing such goodwill as a charge to
     operations, resulting in an increase in goodwill amortization expense for
     1998 of $1,202,000 and an increase in non-controlling interests of
     $408,000.

(j)  The company's consolidated balance sheet at December 31, 1998 includes a
     deferred tax asset of approximately $3,400,000 relating primarily to
     Canadian investment tax credit carryforwards. The restated consolidated
     financial statements include a revised calculation of this deferred tax
     asset in 1998, resulting in an increase of costs of goods sold and
     provision for income taxes in 1998 of $2,166,000 and $1,222,000,
     respectively.

(k)  The company's consolidated balance sheet as of December 31, 1998 reflected
     $26,829,000 due to a joint venture partner as a reduction of advances to
     the investment in the joint venture. The restated consolidated balance
     sheet as of December 31, 1998 has classified this amount as a long-term
     liability. During 1998, the company reclassified a permanent impairment of
     $2,479,000 on a certain investment from costs of goods sold to asset
     impairment charges.

     As reflected in the restated consolidated financial statements, the
company has recorded certain other adjustments, the net effect of which is
presented in the table. None of these entries is significant individually or
in the aggregate.

2. DISAGGREGATED FINANCIAL INFORMATION

INDUSTRY SECTOR INFORMATION

    During 1998, the company adopted Statement of Financial Accounting Standards
No. 131, "Disclosures About Segments of an Enterprise and Related Information"
("SFAS 131"). The adoption of SFAS 131 had no significant impact on the manner
of presentation of Orbital's disaggregated financial information in prior years.
Orbital's operations are organized into three business sectors, which correspond
to the different markets served by the company's products and services, as well
as the manner in which these products and services are managed. Orbital's three
business sectors are: space and ground infrastructure systems, satellite access
products and satellite services. Space and ground infrastructure systems include
launch vehicles, satellites and related space systems, electronics and sensor
systems, and satellite ground systems and software. Satellite access products
include satellite-based navigation products, satellite positioning and
communications products and transportation management systems. Satellite
services include satellite-based two-way mobile data communications,
satellite-based remote imaging and satellite-based voice communications
services.

    The following table presents operating information and identifiable assets
by business sector. Operating income (loss) is total revenues less costs of
goods sold, research and development expenses, selling, general and
administrative expenses, and amortization


                                       40

<PAGE>   41

of goodwill. Identifiable assets are those assets used in the operations of each
business sector. There were no significant sales or transfers between
consolidated sectors.

<TABLE>
<CAPTION>
                                                                               YEARS ENDED DECEMBER 31,
                                                                         ------------------------------------
                                                                             1998        1997         1996
                                                                         ----------  -----------   ----------
                                                                         (restated)  (restated)    (restated)
                                                                                   (IN THOUSANDS)
                      <S>                                                 <C>        <C>           <C>
                      SPACE AND GROUND
                      INFRASTRUCTURE SYSTEMS:
                           Revenues..................................     $ 613,511   $ 474,452    $ 377,166
                           Operating income..........................        48,344      25,966       16,291
                           Identifiable assets.......................       605,316     510,638      369,672
                           Capital expenditures......................        30,844      35,011       23,829
                           Depreciation and amortization.............        26,409      22,190       21,954
                      SATELLITE ACCESS PRODUCTS:
                           Revenues..................................     $ 116,392   $  71,384    $  71,188
                           Operating income (loss)...................       (31,659)    (11,754)       4,902
                           Non-controlling interest in losses of
                             consolidated subsidiaries...............        12,349       8,151           --
                           Gain on sale of subsidiary equity.........            --      21,810           --
                           Identifiable assets.......................       121,196     143,800       32,376
                           Capital expenditures......................         5,450       1,692        3,402
                           Depreciation and amortization.............         4,863       1,962          944
                      SATELLITE SERVICES:
                           Revenues..................................     $     759   $     172    $   1,433
                           Operating loss............................        (4,039)     (6,705)      (7,436)
                           Equity in earnings (losses) of affiliates.       (76,816)    (25,094)      (7,008)
                           Non-controlling interest in (earnings)
                             losses of consolidated subsidiaries.....         1,763      (5,513)       1,473
                           Identifiable assets.......................       168,680     123,447      107,565
                           Capital expenditures......................            --         497       12,613
                           Depreciation and amortization.............            --         401        2,198
                      CONSOLIDATED:
                           Revenues..................................     $ 730,662   $ 546,008    $ 449,787
                           Operating income..........................        12,646       7,507       13,757
                           Equity in earnings (losses) of affiliates.       (76,815)    (25,094)      (7,008)
                           Non-controlling interest in losses of
                             consolidated subsidiaries...............        14,112       2,638        1,473
                           Gain on issuance of subsidiary equity.....            --      21,810           --
                           Identifiable assets.......................       895,192     777,885      509,613
                           Capital expenditures......................        36,294      37,200       39,844
                           Depreciation and amortization.............        31,272      24,553       25,096
</TABLE>

DOMESTIC AND NON-U.S. OPERATIONS

    The following table presents Orbital's revenues, operating income (loss) and
identifiable assets by major originating location:

<TABLE>
<CAPTION>
                                 YEARS ENDED DECEMBER 31,
                           -----------------------------------
                              1998        1997         1996
                           ----------  ----------   ----------
                           (restated)  (restated)   (restated)
                                      (IN THOUSANDS)
<S>                        <C>          <C>         <C>
REVENUES:
     United States .....   $ 644,448    $ 465,177   $ 380,482
     Canada and Mexico .      72,642       75,584      65,350
     Other .............      13,572        5,247       3,955
                           ---------    ---------   ---------
          Total ........   $ 730,662    $ 546,008   $ 449,787
                           =========    =========   =========
OPERATING INCOME (LOSS):
     United States .....   $  11,939    $   5,972   $  11,098
     Canada and Mexico .       2,277        1,465       2,416
     Other .............      (1,570)          70         243
                           ---------    ---------   ---------
          Total ........   $  12,646    $   7,507   $  13,757
                           =========    =========   =========
IDENTIFIABLE ASSETS:
     United States .....   $ 833,054    $ 727,509
     Canada and Mexico .      57,121       46,984
     Other .............       5,017        3,392
                           ---------    ---------
          Total ........   $ 895,192    $ 777,885
                           =========    =========
</TABLE>



                                       41

<PAGE>   42

EXPORT SALES AND MAJOR CUSTOMERS

    Orbital's sales to geographic areas were as follows:

<TABLE>
<CAPTION>
                                YEARS ENDED DECEMBER 31,
                             1998        1997          1996
                          ----------  ----------    ----------
                          (RESTATED)  (RESTATED)    (RESTATED)
                                    (IN THOUSANDS)
<S>                       <C>         <C>          <C>
United States ..........  $551,976     $387,074     $337,917
Canada .................    48,330       39,274       46,742
Far East ...............    39,196       32,875       17,517
Middle East and other...    34,486       24,326       13,859
Southeast Asia .........    28,976       35,688           --
Europe .................    27,698       26,771       33,752
                          --------     --------     --------
          Total ........  $730,662     $546,008     $449,787
                          ========     ========      =======
</TABLE>

    Approximately 46%, 42% and 45% of the company's revenues in 1998, 1997 and
1996, respectively, were generated under contracts with the U.S. government and
its agencies or under subcontracts with the U.S. government's prime contractors.

3. INVESTMENTS IN AND ADVANCES TO AFFILIATES

ORBCOMM

    In 1993, the company's subsidiary, Orbital Communications Corporation
("OCC"), and Teleglobe Mobile Partners ("Teleglobe Mobile"), an affiliate of
Teleglobe Inc. ("Teleglobe"), formed a partnership, ORBCOMM Global, L.P.
("ORBCOMM"), for the design, development, construction, integration, testing and
operation of a low-Earth orbit satellite communications system (the "ORBCOMM
System"). OCC and Teleglobe Mobile are each 50% general partners in ORBCOMM.
Additionally, OCC is a 2% general partner in ORBCOMM USA, L.P. ("ORBCOMM USA")
and Teleglobe Mobile is a 2% general partner in ORBCOMM International Partners,
L.P. ("ORBCOMM International"), two partnerships formed to market the ORBCOMM
System. ORBCOMM is a 98% general partner in each of the two marketing
partnerships.

    Pursuant to the terms of the partnership agreements, (i) OCC and Teleglobe
Mobile share equal responsibility for the operational and financial affairs of
ORBCOMM, (ii) OCC controls and consolidates the operational and financial
affairs of ORBCOMM USA, and (iii) Teleglobe Mobile controls the operational and
financial affairs of ORBCOMM International. Since OCC is unable to control, but
is able to exercise significant influence over ORBCOMM's and ORBCOMM
International's operational and financial affairs, the company accounts for its
investments in ORBCOMM and ORBCOMM International using the equity method of
accounting.

    Orbital is the primary supplier to ORBCOMM of its communications satellites,
launch vehicles and certain of its satellite ground systems and software. During
1998, 1997 and 1996, Orbital recorded sales to ORBCOMM of approximately
$36,596,000, $57,988,000 and $47,215,000, respectively. During 1998, Orbital
deferred invoicing ORBCOMM for approximately $33,000,000 for work done under a
satellite and launch procurement agreement. Approximately one-half of the
deferred invoice amount has been advanced to Orbital by an affiliate of
Teleglobe. This deferral is classified as an advance to ORBCOMM and is repayable
by December 31, 1999, or at the time of ORBCOMM's initial public offering,
whichever occurs first. In addition, since 1995 Orbital has provided certain
administrative services to ORBCOMM on a cost-reimbursable basis. During 1998,
1997 and 1996, Orbital was reimbursed approximately $3,183,000, $2,298,000 and
$1,295,000, respectively, for such services. At December 31, 1998 and 1997,
Orbital had approximately $157,725,000 and $80,682,000, respectively, in
investments in and advances to ORBCOMM, of which $49,570,000 and $32,704,000,
respectively, represented receivables and deferred invoicing (net of the amount
advanced by Teleglobe).

    At December 31, 1998 and 1997, ORBCOMM had approximately $346,634,000 and
$316,969,000 in total assets, $241,844,000 and $210,551,000 in total liabilities
and $104,790,000 and $106,418,000 of total partners' capital, respectively.
ORBCOMM recorded approximately $1,262,000, $527,000 and $420,000 in revenues and
$69,628,000, $31,436,000 and $19,480,000 in net losses for the years ended
December 31, 1998, 1997 and 1996, respectively.

ORBIMAGE

    In 1997, the company's then-subsidiary, ORBIMAGE, completed a private
placement of equity. Since Orbital is unable to control, but is able to exercise
significant influence over ORBIMAGE's operational and financial affairs, the
company uses the equity method

                                       42

<PAGE>   43

of accounting for its ownership interest in ORBIMAGE. As of December 31, 1998
and 1997, the company's investments in and advances to ORBIMAGE were $27,891,000
and $26,443,000, respectively.

    Orbital is the primary supplier to ORBIMAGE of imaging satellites, launch
services and satellite ground systems and software. During the years ended
December 31, 1998 and 1997, Orbital recorded sales to ORBIMAGE of approximately
$89,006,000 and $ $30,079,000, respectively. Additionally, Orbital provides
certain administrative services to ORBIMAGE on a cost-reimbursable basis. During
1998 and 1997, Orbital was reimbursed approximately $1,985,000 and $1,444,000,
respectively, for such administrative services. At December 31, 1998 and 1997,
the company had total receivables due from ORBIMAGE of approximately $18,725,000
and $3,548,000, respectively.

    At December 31, 1998 and 1997, ORBIMAGE had approximately $308,078,000 and
$137,749,000 in total assets, $195,625,000 and $52,389,000 in total liabilities
and $33,964,000 and $49,005,000 of total stockholders' equity, respectively.
ORBIMAGE recorded approximately $11,663,000, $2,062,000, and $1,055,000 in
revenues and $26,538,000, $6,890,000 and $4,895,000 in net losses available to
common stockholders for the years ended December 31, 1998, 1997 and 1996,
respectively.

CCI INTERNATIONAL, N.V.

    In 1998, the company entered into a stock purchase agreement with CCI
International, N.V. ("CCI"), a corporation that plans to provide satellite-based
voice-communication services. In connection with the execution of the agreement,
the company and CCI entered into a satellite and launch vehicle procurement
contract valued at approximately $480,000,000 for the satellites (and a price to
be determined for the launch vehicles in the event Orbital procures them). As of
December 31, 1998, the company's investment in and advances to CCI was
$21,382,000. The company currently owns 40% of CCI and may make additional
investments in CCI during 1999, and uses the modified equity method of
accounting to account for its investment in CCI. However, the company has
provided substantially all CCI's funding, and accordingly, the company did not
recognize any revenue in connection with its satellite contract.

OTHER INVESTMENTS

    The company owns equity interests in several emerging space-related
companies. The cost basis of these investments was approximately $6,947,000 and
$7,275,000, respectively, at December 31, 1998 and 1997.

    The company provides a valuation allowance against investments in affiliates
when it is determined that recovery of all or part of the investment is not
probable. At December 31, 1998 and 1997, approximately $4,338,000 and $4,886,000
of allowance had been recorded against certain of these investments.

4. BUSINESS COMBINATIONS

    RAYTHEON COMPANY

    On December 31, 1998, the company acquired the transportation management
systems business of Raytheon Company for approximately $21,000,000 in cash. The
acquired business produces satellite-based automatic vehicle location systems
for public transit fleets. The company accounted for the acquisition using the
purchase method of accounting. The purchase price exceeded the fair value of the
net assets acquired by approximately $19,931,000, which is being amortized on a
straight-line basis over 15 years.

    ASHTECH INC.

     On December 31, 1997, Orbital merged Magellan with Ashtech Inc.
("Ashtech"). To effect the merger Orbital provided consideration of
approximately $80,000,000 to former Ashtech stockholders consisting of
$25,000,000 in cash and approximately 23,954,000 shares of Magellan common
stock, and now owns a controlling interest of approximately 66% of Magellan.
Orbital recognized a gain of $21,810,000 on the issuance of the shares of
Magellan common stock. The merger was accounted for using the purchase method of
accounting. The purchase price exceeded the fair value of the net assets
acquired by approximately $73,002,000, which is being amortized on a
straight-line basis over 20 years.

    CTA INCORPORATED

    On August 15, 1997, Orbital acquired substantially all the assets, including
all the stock of certain subsidiaries, and certain liabilities relating to the
satellite manufacturing and communications services businesses of CTA
Incorporated ("CTA"). The financial

                                       43
<PAGE>   44

results of the acquired businesses have been included in the company's
consolidated results since August 15, 1997. As consideration, Orbital paid
approximately $13,000,000 in cash, and repaid $27,000,000 of outstanding debt
related to the acquired business. The company accounted for the acquisition
using the purchase method of accounting. The purchase price exceeded the
preliminary estimates of fair value of the net assets acquired by approximately
$65,724,000, which is being amortized on a straight-line basis over 30 years.
During 1998, the company revised the preliminary allocation of the purchase
price to the fair value of the net assets acquired and received a $2,100,000
refund of the initial purchase price pursuant to the terms of the acquisition
agreement, resulting in a net increase in goodwill of approximately $4,500,000.
During the five years following the closing, CTA will also be entitled to
receive (i) royalties from $500,000 to $3,000,000 for sales by the company of
certain geostationary satellites in excess of certain threshold sales, and (ii)
3% of cumulative revenues in excess of $50,000,000 earned during such period
from the acquired transportation management business of CTA.

    ROCKWELL INTERNATIONAL CORPORATION.

    In July 1997, Orbital acquired from Rockwell International Corporation
("Rockwell") the assets and certain liabilities associated with Rockwell's
automotive navigation product line. Orbital paid approximately $3,550,000 in
cash and issued Rockwell a $4,350,000 unsecured note. The company accounted for
the acquisition using the purchase method of accounting. The purchase price
exceeded the fair value of the net assets acquired by approximately $2,262,000,
which is being amortized on a straight-line basis over 10 years.

    The following unaudited, supplemental financial information presents the
consolidated results of operations, on a pro forma basis, as though the
acquisitions were consummated on January 1, 1997:


<TABLE>
<CAPTION>
                                                                                 DECEMBER 31,
                                                                          --------------------------
                                                                             1998            1997
                                                                          ----------      ----------
                                                                          (RESTATED)      (RESTATED)
                                                                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                                      <C>             <C>
              Revenues.........................................           $ 749,734       $ 659,732
              Net income (loss)................................           $ (59,634)      $ (12,976)
              Net income (loss) per common and dilutive share..           $   (1.67)      $   (0.40)
</TABLE>


    The allocation of purchase price to net assets acquired in 1998 may be
adjusted in 1999 if additional information becomes known about certain business
assumptions used to estimate the fair value of such net assets.

    In October 1996, Orbital's wholly owned subsidiary, MacDonald, Dettwiler and
Associates Ltd. ("MDA"), sold substantially all the assets of The PSC
Communications Group Inc. for approximately $13,000,000, resulting in a gain of
approximately $3,600,000. The gain on the sale of $1,980,000, net of taxes, has
been recognized as an extraordinary item since the assets were acquired through
the acquisition of MDA, which was accounted for as a pooling-of-interests.

5. BALANCE SHEET ACCOUNTS

SHORT-TERM INVESTMENTS

    The following table sets forth the aggregate amortized cost, aggregate fair
value and gross unrealized gains for Orbital's short-term investments in debt
securities:

<TABLE>
<CAPTION>
                                       DECEMBER 31,
                                      --------------
                                      1998      1997
                                      ----      ----
                                      (IN THOUSANDS)
<S>                                 <C>       <C>
                 Amortized cost....  $ 2,665   $ 2,301
                 Fair value........    2,665     2,573
                                     -------   -------
                 Unrealized gains..  $    --   $   272
                                     =======   =======
</TABLE>

During 1998, the company did not realize any significant gains on sales of
investments corresponding to unrealized gains included in other comprehensive
income as of December 31, 1997. All debt securities held at December 31, 1998
are scheduled to mature in 1999.


                                       44

<PAGE>   45
INVENTORY

    Inventories, net of allowances for obsolescence, consisted of the following:

<TABLE>
<CAPTION>
                                                                                                      DECEMBER 31,
                                                                                                 ---------------------
                                                                                                    1998        1997
                                                                                                 ----------   --------
                                                                                                 (RESTATED)   (RESTATED)
                                                                                                      (IN THOUSANDS)
<S>                                                                                             <C>          <C>
                                    Components and raw materials....................              $  14,488    $ 24,913
                                    Work-in-process.................................                 45,178      35,246
                                    Finished goods..................................                  6,690       9,980
                                    Allowance for inventory obsolescence............                 (8,215)    (10,900)
                                                                                                   --------    --------
                                              Total.................................              $  58,141    $ 59,239
                                                                                                  =========    ========
</TABLE>

    Work-in-process inventory was reduced by contractual progress payments
received of $5,624,000 and $5,899,000 at December 31, 1998 and 1997,
respectively.

ACCOUNTS RECEIVABLE

    The components of receivables were as follows:

<TABLE>
<CAPTION>
                                                                                  DECEMBER 31,
                                                                              --------------------
                                                                                1998        1997
                                                                              --------    --------
                                                                             (RESTATED)  (RESTATED)
                                                                                  (IN THOUSANDS)
<S>                                                                         <C>          <C>
                                Billed and billable......................     $111,322    $118,612
                                Recoverable costs and accrued profit not
                                  billed.................................      120,371      99,750
                                Retainages due upon contract completion..        4,987       6,132
                                Allowance for doubtful accounts..........      (21,570)    (18,077)
                                                                              --------    --------
                                          Total..........................     $215,110    $206,417
                                                                              ========    ========
</TABLE>

    Approximately 84% of recoverable costs and accrued profit not billed and
retainages due upon contract completion at December 31, 1998 is due within one
year and will be billed on the basis of contract terms and delivery schedules.

    The accuracy and appropriateness of Orbital's direct and indirect costs and
expenses under its government contracts, and therefore its receivables recorded
pursuant to such contracts, are subject to extensive regulation and audit by the
U.S. Defense Contract Audit Agency or by other appropriate agencies of the U.S.
government, which have the right to challenge Orbital's cost estimates or
allocations with respect to any such contracts. Additionally, a substantial
portion of the payments to the company under government contracts are
provisional payments that are subject to potential adjustment upon audit by such
agencies. In the opinion of management, any adjustments likely to result from
inquiries or audits of its contracts will not have a material adverse impact on
the company's financial condition or results of operations.


                                       45




<PAGE>   46

    At December 31, 1998 and 1997, $50,165,000 and $43,294,000, respectively,
were receivable from non-U.S. customers. The company enters into forward
exchange contracts in an effort to hedge against foreign currency fluctuations
on certain receivables and payables denominated in foreign currencies.
Accordingly, Orbital is subject to off-balance sheet market risk for the
possibility that future changes in market prices may make the forward exchange
contracts less valuable. The following table summarizes at December 31, 1998,
outstanding foreign exchange contracts to sell (purchase) foreign currencies,
along with current market values:

<TABLE>
<CAPTION>
                                                       CURRENCIES               CURRENT    UNREALIZED
                                                         HEDGED     CONTRACT     MARKET       GAIN
                              FOREIGN CURRENCY HEDGED   AGAINST      AMOUNT      VALUE       (LOSS)
                              -----------------------  ----------   ---------   --------   ----------
                                                             (U.S. DOLLARS, IN THOUSANDS)
<S>                                                    <C>          <C>         <C>        <C>
                            Australian Dollars.......    CD          $   144     $   142     $    (2)
                            Belgian Francs...........    CD              243         232         (11)
                            European Currency Units..    CD            2,053       2,023         (30)
                            European Currency Units..    PS              759         732         (27)
                            Pounds Sterling..........    CD             (373)       (384)        (11)
                            Norwegian Kroner.........    CD            1,016         981         (35)
                            U.S. Dollars.............    CD           16,430      14,917      (1,513)
                            U.S. Dollars.............    PS               64          66           2
</TABLE>

- ----------

     CD - Canadian Dollars


     PS - Pounds Sterling


    MDA is also subject to off-balance sheet risk for a letter-of-credit
facility to cover foreign exchange commitments. At December 31, 1998,
$10,000,000 of letters of credit were secured by this facility and $37,000,000
remained available.

PROPERTY, PLANT AND EQUIPMENT

    Property, plant and equipment consisted of the following:

<TABLE>
<CAPTION>
                                                                                    DECEMBER 31,
                                                                                ---------------------
                                                                                   1998       1997
                                                                                ----------  ---------
                                                                                (RESTATED) (RESTATED)
                                                                                   (IN THOUSANDS)
<S>                                                                             <C>         <C>
                             Land..........................................     $   4,123   $     852
                             Buildings and leasehold improvements..........        21,557      22,112
                             Machinery and equipment.......................       167,722     138,499
                             Equipment and satellite systems under
                               construction................................        18,616      27,367
                             Software, intellectual property and technical
                               drawings....................................        27,222      15,750
                             Accumulated depreciation and amortization.....       (99,839)    (79,253)
                                                                                ---------   ---------
                                       Total...............................     $ 139,401   $ 125,327
                                                                                =========   =========
</TABLE>

    Interest expense of approximately $1,705,000, $429,000 and $1,266,000 was
capitalized during 1998, 1997 and 1996, respectively, as part of the historical
cost of land, buildings and equipment under construction.

ACCRUED EXPENSES

    Accrued expenses consisted of the following:

<TABLE>
<CAPTION>
                                                                                DECEMBER 31,
                                                                            --------------------
                                                                              1998       1997
                                                                            --------   ---------
                                                                              (IN THOUSANDS)
<S>                                                                         <C>        <C>
                                   Payroll, payroll taxes and fringe        $ 39,289   $ 28,291
                                     benefits..........................
                                   Payable to subcontractors...........       18,703     15,534
                                   Accrued contract costs..............       32,118     38,866
                                   Other accrued expenses..............       18,378     15,327
                                                                            --------   --------
                                             Total.....................     $108,488   $ 98,018
                                                                            ========   ========
</TABLE>

    Approximately $6,520,000 and $16,332,000 of accrued contract costs at
December 31, 1998 and 1997, respectively, related to certain contracts acquired
in 1997.


                                       46
<PAGE>   47

6. DEBT OBLIGATIONS

    The following sets forth long-term obligations, excluding capital lease
obligations (see note 7):

<TABLE>
<CAPTION>
                                                                                        DECEMBER 31,
                                                                                    ---------------------
                                                                                      1998        1997
                                                                                    ---------   ---------
                                                                                       (IN THOUSANDS)
<S>                                                                                 <C>         <C>
                          7% note, principal and interest due monthly through       $      -    $    631
                            1998................................................
                          7.09 - 9.35% notes, principal and interest due monthly
                            1998-1999...........................................       3,098       7,421
                          8.25% bank note, principal and interest due monthly
                            through 2001........................................       1,142           -
                          7.19% - 8.64% notes, principal and interest due monthly
                            through 2003........................................      24,428      24,562
                          8.41% note, principal and interest due monthly through
                            2005................................................       8,439       9,407
                          6% note, principal and interest due semi-annually
                            through 2000........................................       2,900       4,350
                          6% bank notes, principal and interest due monthly
                            through 2002........................................       1,823       1,964
                          12% note, interest due semi-annually, principal due
                            1999-2001...........................................      20,000      20,000
                          7.5% bank notes, interest and principal due quarterly
                            through 2002........................................      36,000      47,750
                          5% convertible subordinated notes, interest due
                            semi-annually, principal due 2002...................     100,000     100,000
                                                                                    --------    --------
                                                                                     197,830     216,085
                          LESS CURRENT PORTION..................................     (19,236)    (18,189)
                                                                                    --------    --------
                          LONG-TERM PORTION.....................................    $178,594    $197,896
                                                                                    ========    ========
</TABLE>

    The 7.09% - 9.35% notes are secured by certain equipment located at the
company's Germantown, Maryland facility. The 8.25% bank note is secured by
certain Magellan assets. The 7.19% - 8.64% notes are secured by certain office,
computer and test equipment located at the company's Germantown, Maryland,
Chandler, Arizona and Dulles, Virginia facilities. The 8.41% note is secured by
the company's L-1011 aircraft. The 6% note is unsecured.

    The 6% bank notes due 2002 are secured by MDA's accounts receivable,
inventory and certain other assets. The related credit agreements contain
certain covenants with respect to MDA's leverage ratio and tangible net worth.

    The company's 12% unsecured note restricts the payment of cash dividends and
contains certain covenants with respect to fixed charges ratio, leverage ratio
and tangible net worth, and includes certain cross-default provisions.

    Orbital's primary credit facility from an international syndicate of six
banks was amended and restated in 1998 to increase maximum borrowings to
$200,000,000 from $100,000,000. The interest rate charged under the facility is
a variable rate based on the prime rate or LIBOR. The weighted average interest
rate on borrowings outstanding under this facility at December 31, 1998 was
7.5%. Outstanding borrowings are collateralized by the company's accounts
receivable. The facility prohibits the payment of cash dividends and contains
certain covenants with respect to the company's working capital levels, fixed
charge ratio, leverage ratio and net worth, and expires in December 2002.

    On September 16, 1997, Orbital sold $100,000,000 of 5% convertible
subordinated notes due October 2002. The notes, which are non-callable for three
years, are convertible at the option of the holders into Orbital common stock at
a conversion price of $28.00 per share, subject to adjustment in certain events.

    The fair value of Orbital's long-term obligations at December 31, 1998 and
1997 is estimated at approximately $127,830,000 and $178,455,000, respectively.
Fair value estimates are based on quoted market prices or on current rates
offered for debt of similar remaining maturities. Scheduled maturities of
long-term debt for each of the years in the five-year period ending December 31,
2003 and thereafter are $19,236,000, $16,614,000, $15,491,000, $142,366,000,
$1,668,000 and $2,455,000, respectively.

    Magellan maintains its own short-term credit facility. At December 31, 1998
and 1997, approximately $6,008,000 and $6,567,000 was outstanding on this
facility at an average borrowing rate of 9.25% and 8%, respectively. These
borrowings are secured by Magellan's accounts receivable, inventory, equipment
and general intangibles.

    In 1996, ORBCOMM issued $170,000,000 senior unsecured notes due 2004 (the
"ORBCOMM Notes") to institutional investors. The ORBCOMM Notes bear interest at
a fixed rate of 14% and provide for noteholder participation in future ORBCOMM
service



                                       47
<PAGE>   48

revenues. The ORBCOMM Notes are fully and unconditionally guaranteed on
a joint and several basis by OCC and Teleglobe Mobile. The guarantee is
non-recourse to Orbital.

7. LEASE COMMITMENTS

    Aggregate minimum rental commitments under non-cancelable operating and
capital leases (primarily for office space and equipment) at December 31, 1998
were as follows:

<TABLE>
<CAPTION>
                                                                   OPERATING   CAPITAL
                                                                   ---------   -------
                                                                     (IN THOUSANDS)
<S>                                                               <C>         <C>
                               1999.......................         $ 14,425    $ 1,877
                               2000.......................           13,462      1,308
                               2001.......................           10,995      1,213
                               2002.......................            9,135        202
                               2003.......................            8,878        169
                               2004 and thereafter........           29,948          -
                                                                   --------    -------
                                                                   $ 86,843      4,769
                                                                   ========
                               Less interest at 10%.......                        (512)
                               Less current portion.......                      (1,570)
                                                                               -------
                               Long-term portion..........                     $ 2,687
                                                                               =======
</TABLE>

    Rent expense for 1998, 1997 and 1996 was approximately $14,124,000,
$10,870,000 and $12,300,000, respectively.

8. INCOME TAXES

    The provisions for income taxes consisted of the following:

<TABLE>
<CAPTION>
                                                                 YEARS ENDED DECEMBER 31,
                                                             -----------------------------
                                                                1998       1997      1996
                                                             ---------  ---------  -------
                                                             (restated)(restated) (restated)
                                                                     (IN THOUSANDS)
<S>                                                          <C>        <C>        <C>
                                      CURRENT PROVISION:
                                        U.S. Federal.....      $    -     $    -     $    -
                                        Foreign..........       1,394      1,283        211
                                        State............           -          -          -
                                      DEFERRED PROVISION:
                                        U.S. Federal.....           -     10,898          -
                                        Foreign..........       3,822        752          -
                                        State............           -          -          -
                                                               ------     -------    ------
                                                Total....      $5,216     $12,933    $  211
                                                               ======     =======    ======
</TABLE>

    The income tax provisions were different from those computed using the
statutory U.S. Federal income tax rate as set forth below:

<TABLE>
<CAPTION>
                                                                                YEARS ENDED DECEMBER 31,
                                                                            --------------------------------
                                                                              1998       1997        1996
                                                                            --------   ---------   ---------
                                                                            (restated) (restated)  (restated)
<S>                                                                         <C>        <C>         <C>
                        U.S. Federal statutory rate.....................      (35.0)%        35%         35%
                        Changes in valuation allowance..................       53.4       815.2       (43.6)
                        Investments in affiliates and non-controlling
                          interests in net assets of consolidated
                          subsidiaries..................................        2.0       582.2           -
                        Intangible amortization.........................        4.7        91.4        21.9
                        Foreign income taxes, net.......................        2.2        60.3       (21.4)
                        Other, net......................................      (17.1)     (737.7)       10.7
                                                                            --------   --------       -----
                                  Effective rate........................       10.2%      846.4%        2.6%
                                                                            ========   ========       =====
</TABLE>




                                       48
<PAGE>   49

    The tax effects of significant temporary differences were as follows:

<TABLE>
<CAPTION>
                                                                                   DECEMBER 31,
                                                                              ---------------------
                                                                                 1998        1997
                                                                              ---------   ---------
                                                                                   (RESTATED)
                                                                                 (IN THOUSANDS)
<S>                                                                           <C>         <C>
                               TAX ASSETS:
                                 U.S. Federal and state net operating loss
                                   carryforward...........................    $ 106,390   $  67,517
                                 Non-deductible financial statement
                                   accruals...............................       49,384      55,792
                                 U.S. Federal and foreign tax credit
                                   carryforward...........................        8,771      14,464
                                 Intangible assets........................        8,364       5,988
                                                                              ---------   ---------
                                                                                172,909     143,761
                                 Valuation allowance......................      (94,185)    (66,889)
                                                                              ---------   ---------
                                    Tax assets, net.......................    $  78,724   $  76,872
                                                                              =========   =========
                               TAX LIABILITIES:
                                 Excess deductions for tax reporting
                                   purposes...............................    $  36,760   $  28,141
                                 Excess tax depreciation..................       27,216      15,916
                                 Investments in subsidiaries/affiliates...           --       6,198
                                 Percentage-of-completion accounting......        5,049       5,211
                                                                              ---------   ---------
                                    Tax liabilities.......................    $  69,025   $  55,466
                                                                              =========   =========
</TABLE>

    In 1998, 1997 and 1996 approximately $8,300,000, $5,200,000 and $4,900,000,
respectively, of income (loss) before provision for income taxes was generated

from foreign sources. At December 31, 1998, the company had U.S. federal net
operating loss carryforwards (portions of which expire beginning in 2004) of
approximately $278,000,000, and U.S. research and experimental income tax credit
carryforwards of approximately $3,148,000, and foreign investment income tax
credit carryforwards (subject to expiration in 2008) of approximately
$3,778,000. Such net operating loss carryforwards and tax credits are subject to
certain limitations and other restrictions. Additionally, at December 31, 1998,
approximately $43,000,000 of net deferred tax assets will reduce goodwill and
approximately $9,700,000 of net deferred tax assets will reduce equity to the
extent such assets reduce future taxable income. Management believes that it is
more likely than not that the net deferred tax assets recorded will be realized
in the future.

9. COMMON STOCK AND STOCK OPTION PLANS

    In October 1998, the company adopted a stockholder rights plan in which
preferred stock purchase rights were granted as a dividend at the rate of one
right for each share of common stock to stockholders of record on November 13,
1998. The plan is designed to deter coercive or unfair takeover tactics. The
rights become exercisable only if a person or group in the future becomes the
beneficial owner of 15% or more of Orbital's common stock, or announces a tender
or exchange offer that would result in its ownership of 15% of more of the
company's common stock. The rights are generally redeemable by Orbital's Board
of Directors at a redemption price of $0.005 per right and expire on October 31,
2008.

    Effective January 1, 1999, the company adopted, subject to stockholder
approval, an Employee Stock Purchase Plan ("ESPP") for employees of the company
(including its consolidated U.S. subsidiaries). Under the ESPP, eligible
employees may purchase up to 1,000,000 shares of Orbital's common stock, subject
to certain limitations. The ESPP has semi-annual offering periods beginning on
January 1 and July 1 and allows employees to purchase shares of stock at the
lesser of 85% of the fair market value of shares at either the beginning or the
end of the offering period. Also effective January 1, 1999, the company adopted
a similar employee stock purchase plan for its Canadian employees to purchase up
to 500,000 shares of Orbital common stock.

    As of December 31, 1998, the company's 1997 Stock Option and Incentive Plan
(the "1997 Plan") provided for awards of up to 3,200,000 incentive or
non-qualified stock options and shares of restricted stock to employees,
directors, consultants and advisors of the company and its subsidiaries. In
January 1999, the Board approved an amendment to the 1997 Plan to increase the
number of shares available for option grants by 1,800,000 to 5,000,000. Under
the terms of the 1997 Plan, options may not be issued at less than 100% of the
fair market value of the company's common stock on the date of grant. Options
under the 1997 Plan vest at a rate set forth by the Board of Directors in each
individual option agreement, generally in one-third increments over a three-year
period following the date of grant. Options expire no more than ten years
following the grant date. The 1997 Plan provides for automatic grants of
non-qualified stock options to nonemployee directors of the company. The company
also has options outstanding that were issued pursuant to two predecessor plans
to the 1997 Plan as well as replacement options issued in connection with
certain acquisitions.



                                       49
<PAGE>   50

    The following two tables summarize information regarding options under the
company's stock option plans for the last three years:

<TABLE>
<CAPTION>
                                                                                           WEIGHTED
                                                                                            AVERAGE   OUTSTANDING
                                                                  NUMBER OF  OPTION PRICE  EXERCISE       AND
                                  ORBITAL OPTIONS                  SHARES      PER SHARE     PRICE    EXERCISABLE
                         --------------------------------        ---------   ------------  --------   -----------
<S>                                                              <C>         <C>           <C>        <C>
                         Outstanding at December 31, 1995.....   2,240,525   $1.82-$22.00   $ 14.16    1,133,713
                           Granted............................   1,372,000    12.25-17.63     13.26
                           Exercised..........................    (298,916)    1.82-17.75      7.20
                           Cancelled or expired...............    (588,399)    3.51-22.00     20.23
                                                                 ----------
                         Outstanding at December 31, 1996.....   2,725,210     1.82-22.00     13.10    1,324,316
                           Granted............................   1,908,650    13.50-24.00     17.29
                           Exercised..........................    (326,263)    1.82-18.81     10.43
                           Cancelled or expired...............    (300,306)    1.82-22.00     15.12
                                                                 ----------
                         Outstanding at December 31, 1997.....   4,007,291     1.84-24.00     15.16    1,549,185
                           Granted............................   2,236,700    18.38-38.44     32.49
                           Exercised..........................  (1,086,537)    1.76-20.75     13.39
                           Cancelled or expired...............    (713,898)    3.51-38.44     35.07
                                                                 ----------
                         Outstanding at December 31, 1998.....   4,443,556   $3.51-$38.44   $ 21.09    1,548,218
                                                                 ==========  ============   =======    =========
</TABLE>

<TABLE>
<CAPTION>
                                                OPTIONS OUTSTANDING                        OPTIONS EXERCISABLE
                                --------------------------------------------------  ---------------------------------
                                                     WEIGHTED
                                     NUMBER           AVERAGE          WEIGHTED          NUMBER           WEIGHTED
                 RANGE OF          OUTSTANDING       REMAINING          AVERAGE        EXERCISABLE         AVERAGE
              EXERCISE PRICES   AT DEC. 31, 1998 CONTRACTUAL LIFE   EXERCISE PRICE  AT DEC. 31, 1998   EXERCISE PRICE
              ---------------   ---------------- ----------------   --------------  ----------------   --------------
<S>                             <C>              <C>                <C>             <C>                <C>
                 $ 3.51-$16.50     1,987,735           6.66             $ 14.30        1,064,127           $ 13.43
                 $16.63-$30.69     1,959,821           8.76             $ 24.26          450,757           $ 18.60
                 $32.88-$38.44       496,000           9.35             $ 35.77           33,334           $ 32.88
                 -------------     ---------           ----             -------        ---------           -------
                 $ 3.51-$38.44     4,443,556           7.88             $ 21.09        1,548,218           $ 15.36
                 =============     =========           ====             =======        =========           =======
</TABLE>

    OCC adopted a stock option plan in 1992 (the "OCC Plan"). The OCC Plan
provides for grants of incentive and non-qualified stock options to purchase OCC
common stock to officers and employees of ORBCOMM and the company. Under the
terms of the OCC Plan, incentive stock options may not be granted at less than
100% of the fair market value, and non-qualified options may not be granted at
less than 85% of the fair market value of OCC common stock at the date of grant
as determined by OCC's Board of Directors. Options under the OCC Plan vest at a
rate set forth by the Board of Directors in each individual option agreement,
generally in one-fourth increments over a four-year period following the date of
grant. Certain provisions of the OCC Plan require OCC to repurchase, with cash
or promissory notes, the common stock acquired pursuant to the options. The cash
repurchase amount is restricted by the terms of the ORBCOMM Notes to an amount
not to exceed $1,000,000 in any one year. During 1998 and 1997, OCC repurchased
1,000 and 43,800 shares, respectively, of OCC common stock under this provision.

    The following two tables summarize information regarding options under the
OCC Plan for the last three years:

<TABLE>
<CAPTION>
                                                                                         WEIGHTED
                                                                                         AVERAGE   OUTSTANDING
                                                                NUMBER OF  OPTION PRICE  EXERCISE      AND
                                    OCC OPTIONS                  SHARES      PER SHARE    PRICE    EXERCISABLE
                         -------------------------------       ----------  ------------ ---------  ------------
<S>                                                            <C>         <C>          <C>        <C>
                         Outstanding at December 31, 1995...     545,900   $1.50-$14.00   $  5.56     411,086
                           Granted..........................     154,500    17.00-25.00     20.50
                           Exercised........................     (67,270)    1.50-13.00      2.43
                           Cancelled or expired.............     (34,300)    1.50-17.00     13.81
                                                               ---------
                         Outstanding at December 31, 1996...     598,830     1.50-25.00      9.40     393,903
                           Granted..........................     284,500          26.50     26.50
                           Exercised........................     (20,900)    1.50-25.00      6.68
                           Cancelled or expired.............    (112,600)    1.50-25.00     14.86
                                                               ---------
                         Outstanding at December 31, 1997...     749,830     1.50-26.50     15.22     415,804
                           Granted..........................     305,300    26.50-39.75     32.37
                           Exercised........................     (32,600)    1.50-13.00      3.15
                           Cancelled or expired.............     (17,700)    1.50-26.50     23.94
                                                               ---------
                         Outstanding at December 31, 1998...   1,004,830   $1.50-$39.75   $ 20.40     520,864
                                                               ==========  ============   =======     =======
</TABLE>



                                       50
<PAGE>   51
<TABLE>
<CAPTION>
                                                           WEIGHTED
                                         NUMBER            AVERAGE           WEIGHTED         NUMBER                  WEIGHTED
                     RANGE OF          OUTSTANDING        REMAINING           AVERAGE       EXERCISABLE               AVERAGE
                  EXERCISE PRICES   AT DEC. 31, 1998   CONTRACTUAL LIFE    EXERCISE PRICE   AT DEC. 31, 1998       EXERCISE PRICE
                 ----------------   ----------------   ----------------    --------------   ----------------       --------------
<S>                                <C>                <C>                 <C>              <C>                    <C>
                 $1.50-$13.00 ..         345,530            4.10             $   4.96         345,530                 $    4.96
                 $17.00-$25.00..          77,500            7.19             $  20.35          43,750                 $   19.97
                 $26.50-$39.75..         581,800            8.83             $  29.58         131,584                 $   26.50
                 ---------------       ---------            ----             --------         -------                 ---------
                 $1.50-$39.75 ..       1,004,830            7.08             $  20.40         520,864                 $   11.66
                 ===============       =========            ====             ========         =======                 =========
</TABLE>


    Magellan adopted a stock option plan in 1998 (the "1998 Magellan Plan"). The
1998 Magellan Plan authorizes the issuance of incentive or non-qualified options
to purchase up to 19,900,000 shares of Magellan common stock to Magellan and
Orbital employees, consultants or advisors. Stock options may not be granted
with an exercise price less than 85% of the fair market value of the common
stock at the date of grant as determined by Magellan's Board of Directors.
Options under the 1998 Magellan Plan vest at a rate set forth by the Board of
Directors in each individual option agreement, generally in one-third increments
over a three-year period following the date of the grant. There are also
Magellan options outstanding that were issued pursuant to an option plan adopted
in 1996.

    The following two tables summarize information regarding options under
Magellan's stock option plans for the last three years:

<TABLE>
<CAPTION>
                                                                                            WEIGHTED        OUTSTANDING
                                                               NUMBER OF     OPTION PRICE    AVERAGE            AND
                              MAGELLAN OPTIONS                  SHARES         PER SHARE  EXERCISE PRICE    EXERCISABLE
                      ------------------------------------     ---------   -------------- --------------   ------------
<S>                                                           <C>         <C>            <C>              <C>
                      Outstanding at December 31, 1995....            --             --         --                --
                        Granted...........................     6,915,900   $       1.10     $ 1.10
                        Exercised.........................            --             --         --
                        Cancelled or expired..............      (322,300)          1.10       1.10
                                                              ----------
                      Outstanding at December 31, 1996....     6,593,600           1.10       1.10           667,539
                        Granted...........................     1,717,500           1.10       1.10
                        Exercised.........................      (103,909)          1.10       1.10
                        Cancelled or expired..............    (1,427,531)          1.10       1.10
                                                              ----------
                      Outstanding at December 31, 1997....     6,779,660           1.10       1.10         2,528,097
                        Granted...........................    15,307,204           0.40       0.40
                        Exercised.........................       (21,300)     0.40-1.10    $  0.98
                        Cancelled or expired..............    (5,093,210)     0.40-1.10       1.03
                                                              ----------
                      Outstanding at December 31, 1998....    16,972,354   $ 0.40-$1.10    $  0.47         5,389,208
                                                              ==========   ============    =======        ==========
</TABLE>


<TABLE>
<CAPTION>

                                        NUMBER          AVERAGE           WEIGHTED         NUMBER             WEIGHTED
                    RANGE OF         OUTSTANDING       REMAINING          AVERAGE       EXERCISABLE           AVERAGE
                EXERCISE PRICES   AT DEC., 31, 1998  CONTRACTUAL LIFE  EXERCISE PRICE  AT DEC., 31, 1998   EXERCISE PRICE
                ---------------   -----------------  ----------------  --------------- -----------------   ---------------
<S>                              <C>                <C>               <C>             <C>                 <C>
                $0.40-$0.40....       15,268,917          8.28             $ 0.40         3,900,075            $ 0.40
                $1.10-$1.10....        1,703,437          7.59             $ 1.10         1,489,133            $ 1.10
                -----------           ----------          ----             ------         ---------            ------
                $0.40-$1.10....       16,972,354          8.21             $ 0.47         5,389,208            $ 0.59
                ===========           ==========          ====             ======         =========            ======
</TABLE>


    In connection with Magellan's merger with Ashtech on December 31, 1997,
Magellan assumed Ashtech's option plan and issued replacement options that are
exercisable into Magellan common stock. At December 31, 1998, 650,077
non-qualified replacement options were outstanding, 494,561 of which were
exercisable at prices ranging from $0.81 to $1.72. The weighted average
remaining contractual life on these outstanding options is seven years.

10. STOCK-BASED COMPENSATION

    The company uses the Black-Scholes option pricing model to determine the pro
forma impact under SFAS 123 to the company's net income and earnings per share.
The model utilizes certain information, such as the interest rate on a risk-free
security maturing generally at the same time as the option being valued, and
requires certain assumptions, such as the expected amount of time an option


                                       51

<PAGE>   52


    will be outstanding until it is exercised or it expires, to calculate the
weighted average fair value per share of stock options granted. This information
and the assumptions used for 1998, 1997 and 1996 for all option plans is
summarized as follows:


<TABLE>
<CAPTION>
                           ADDITIONAL SHARES                                                                  WEIGHTED AVERAGE
                             AVAILABLE AT                                              RISK-FREE                 FAIR VALUE
                             DECEMBER 31,                 VOLATILITY                 INTEREST RATE         PER SHARE AT GRANT DATE
                     ---------------------------  --------------------------  -------------------------- ---------------------------
                        1998      1997     1996     1998     1997      1996     1998     1997     1996     1998      1997     1996
                     ---------  -------- -------- -------- --------  -------- -------- -------- -------- --------  --------  -------
<S>                 <C>        <C>      <C>        <C>      <C>       <C>      <C>      <C>      <C>     <C>       <C>      <C>
 Orbital Plans....     271,619  218,868  231,955     55%      54%       56%      5.8%     6.1%     5.3%   $ 32.49   $ 17.29  $ 13.26
 OCC Plan.........      56,925   48,878   20,778     30%      30%       30%      5.4%     6.1%     5.6%   $ 32.37   $ 26.50  $ 20.50
 Magellan Plans...   9,892,346  116,431  406,400     30%      30%       30%      5.5%     5.9%     6.4%   $  0.40   $  1.10  $  1.10
</TABLE>


The assumed expected dividend yield was zero for all years for all option plans.
The assumed average expected life for all options for all years was 4.5 years.

    Had the company determined compensation expense in accordance with the
provisions of SFAS 123, based on the calculated fair value of stock options at
the grant date, the company's net loss, net loss per common share and net loss
per common share, assuming dilution, would have been ($76,176,000), ($2.14) and
($1.89), respectively, for the year ended December 31, 1998; ($21,657,000),
($0.67) and ($0.64), respectively, for the year ended December 31, 1997; and
($743,000), ($0.03) and ($0.02), respectively, for the year ended December 31,
1996. Pro forma net loss reflects only options granted in 1998, 1997 and 1996
and, therefore, may not be representative of the effects for future periods.

    In 1996, the company issued 150,000 stock appreciation rights that vested
annually through 1998. Payment was dependent on appreciation of the company's
common stock over the vesting period. The company recorded approximately
$250,000 and $1,470,000, respectively, in compensation expense during 1998 and
1997 with respect to these rights (none in 1996).

11. SUPPLEMENTAL DISCLOSURES

DEFINED CONTRIBUTION PLANS

    At December 31, 1998, the company had several defined contribution plans
(the "Plans") generally covering all full-time employees in the U.S. and Canada.
Company contributions to the Plans are made based on certain plan provisions and
at the discretion of the Board of Directors, and were approximately $10,370,000,
$9,108,000 and $7,097,000 during 1998, 1997 and 1996, respectively.

CASH FLOWS

    Cash payments for interest and income taxes were as follows:

<TABLE>
<CAPTION>
                                                                   YEARS ENDED DECEMBER 31,
                                                                --------------------------------
                                                                   1998       1997        1996
                                                                ---------- ----------   --------
                                                                       (IN THOUSANDS)
<S>                                                             <C>        <C>         <C>
                    Interest paid.............................  $ 16,032   $ 10,059    $ 10,860
                    Income taxes paid, net of refunds.........     1,624        544       1,327
</TABLE>


                                       52

<PAGE>   53

NET INCOME (LOSS) PER COMMON SHARE

    Net income (loss) and outstanding shares of common stock used in calculating
earnings (loss) per share differed from those amounts reported in the
consolidated financial statements as follows:

<TABLE>
<CAPTION>
                                                                             NET INCOME       NET INCOME (LOSS)
                                                                               (LOSS)         PER COMMON SHARE,
                                                                          PER COMMON SHARE    ASSUMING DILUTION
                                                                          ----------------    ------------------
                                                                                       (RESTATED)
                                                                                     (IN THOUSANDS)
<S>                                                                       <C>                 <C>
                         1998
                         Net loss.......................................      $(56,552)                N/A
                                                                               =======
                         Outstanding common shares......................        37,018                  N/A
                         Effect of weighting for outstanding shares.....        (1,393)                 N/A
                                                                               -------              -------
                              Adjusted shares...........................        35,625                  N/A
                                                                               =======              =======
                         1997
                         Net loss.......................................      $(11,405)                 N/A
                                                                               =======
                         Assuming conversion of convertible notes.......            --                  N/A
                                                                               -------              -------
                         Outstanding common shares......................        32,482                  N/A
                         Effect of weighting for outstanding shares.....          (199)                 N/A
                                                                               -------              -------
                              Adjusted shares...........................        32,283                  N/A
                                                                               =======              =======
                         1996
                         Net income.....................................      $  9,942             $  9,942
                                                                               =======              =======
                         Assuming conversion of convertible notes.......            --                2,357
                                                                               -------              -------
                              Net income, as adjusted...................      $  9,942             $ 12,299
                                                                               =======              =======
                         Outstanding common shares......................        32,161               32,161
                         Effect of weighting for outstanding shares.....        (3,024)              (3,024)
                         Dilutive impact of outstanding stock options...            --                   83
                         Assuming conversion of convertible notes.......            --                2,396
                                                                               -------              -------
                              Adjusted shares...........................        29,137               31,616
                                                                               =======              =======
</TABLE>


    In periods of net loss, the assumed conversion of convertible notes and
stock options are anti-dilutive. For the year ended December 31, 1998 and 1997,
assuming conversion of convertible notes and the dilutive impact of outstanding
stock options, diluted shares would have been 40,336,587 and 33,981,000,
respectively.







                                       53

<PAGE>   54

12.  SUMMARY SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)

     Management has determined to restate its previously issued consolidated
financial statements for each of the quarters in 1998 and 1997 with respect to
its accounting treatment for certain matters described below. The following is a
summary of selected quarterly financial data for the previous two years:


<TABLE>
<CAPTION>
                                                                                   QUARTER ENDED
                                                                   ---------------------------------------------
                                                                    MARCH 31     JUNE 30    SEPT. 30     DEC. 31
                                                                   ---------     -------    --------     -------
                                                                        (IN THOUSANDS, EXCEPT SHARE DATA)
<S>                                                               <C>         <C>         <C>         <C>
                   1998 (AS PREVIOUSLY REPORTED)
                   Revenues....................................     $ 186,159   $ 184,516   $ 187,688   $ 175,914
                   Gross profit................................        51,374      50,851      46,493      38,838
                   Income (loss) from operations...............        13,365       8,251       9,292      (5,615)
                   Net income (loss)...........................         4,745       5,998       2,436     (19,551)
                   Net income (loss) per common share..........          0.14        0.17        0.07       (0.53)
                   Net income (loss) per common share, assuming
                     dilution..................................          0.13        0.17        0.06       (0.53)
                   1997 (AS PREVIOUSLY REPORTED)
                   Revenues....................................       122,112     142,226     164,670     176,967
                   Gross profit................................        33,678      39,673      46,015      29,837
                   Income from operations......................         6,047      11,005      12,249         193
                   Net income..................................         5,094       5,603       6,130       6,178
                   Net income per common share.................          0.16        0.17        0.19        0.20
                   Net income per common share, assuming
                     dilution..................................          0.16        0.17        0.18        0.18
                   1998 (AS RESTATED)
                   Revenues....................................       186,027     181,926     187,028     175,681
                   Gross profit................................        50,970      43,547      46,089      40,428
                   Income (loss) from operations...............        10,853       1,323       9,296      (8,826)
                   Net loss....................................       (19,331)     (9,373)     (2,226)    (25,622)
                   Net loss per common and diluted share.......         (0.59)      (0.26)      (0.06)      (0.69)
                   1997  (AS RESTATED)
                   Revenues....................................       113,273      90,263     163,310     179,162
                   Gross profit................................        30,018      22,439      45,641      34,549
                   Income (loss) from operations...............         2,936      (9,150)     10,383       3,338
                   Net income (loss)...........................         2,308     (20,274)      1,001       5,577
                   Net income (loss) per common share..........          0.07       (0.63)       0.10        0.17
                   Net income (loss) per common share,
                     assuming dilution.........................          0.07       (0.63)       0.10        0.17
</TABLE>

EQUITY METHOD ACCOUNTING RESTATEMENT ADJUSTMENTS

(a)  As a result of certain participating rights granted to holders of
     convertible preferred stock of ORBIMAGE, Orbital significantly influences,
     but does not control, ORBIMAGE even though it owns substantially all of
     ORBIMAGE's outstanding common stock. The company's prior consolidated
     financial statements reflected the company's application of the equity
     method of accounting as it pertained to ORBIMAGE based on Orbital's
     percentage share of ownership of ORBIMAGE calculated to give effect to the
     assumed conversion of ORBIMAGE's outstanding convertible preferred stock
     into ORBIMAGE common stock. As reflected in its restated financial
     statements, the company applies the equity method of accounting as it
     pertains to ORBIMAGE based on its ownership of outstanding common stock
     without giving effect to the assumed conversion of ORBIMAGE's outstanding
     convertible preferred stock. The company has also adjusted the application
     of the equity method with respect to its investment in CCI. The effect of
     this revision is to increase equity in losses of affiliates as follows (in
     thousands):





                                       54

<PAGE>   55


<TABLE>
<CAPTION>

                         March 31           June 30          September 30        December 30

<S>                     <C>                <C>              <C>                 <C>
     1998                  $6,429            $  3,376              $325               $(1,611)

     1997                      --                $100             $(329)                 $927

</TABLE>



(b)  In the first quarter of 1998, pursuant to rights granted under a 1997 stock
     purchase agreement, ORBIMAGE's minority investors acquired 227,295 shares
     of ORBIMAGE's convertible preferred stock for total consideration of
     $22,729,500. ORBIMAGE's convertible preferred stock is convertible into
     ORBIMAGE's common stock based on a per common share price of $4.17 that was
     less than the fair value of ORBIMAGE's common when the additional preferred
     shares were acquired in 1998. Previously, the company's financial
     statements did not give effect to any beneficial conversion discount as an
     additional net loss allocable to the company pursuant to the equity method
     of accounting. As reflected in the restated consolidated financial
     statements presented herein, Orbital calculates its equity in losses of
     affiliates including the impact of the beneficial conversion. The effect of
     these revisions is to increase equity in losses of affiliates as follows
     (in thousands):

<TABLE>
<CAPTION>

                          March 31            June 30        September 30        December 30
<S>                      <C>                 <C>            <C>                 <C>
     1998                 $10,989               $875              $898              $933
</TABLE>



(c)  ORBIMAGE's preferred stockholders are entitled to receive a cumulative
     dividend, payable either in cash or in additional shares of convertible
     preferred stock. To date all dividends have been paid in additional shares
     of convertible preferred stock. Previously, the company's consolidated
     financial statements did not reflect additional net losses allocable to
     Orbital as a result of ORBIMAGE's declaration of such "in-kind" dividends
     on its convertible preferred stock. As reflected in the restated
     consolidated financial statements presented herein, Orbital calculates
     its equity in losses of affiliates talking into account such non-cash
     dividends at their fair value. The effect of these revisions is to
     increase equity in losses of affiliates as follows (in thousands):

<TABLE>
<CAPTION>


                            March 31          June 30        September 30        December 30
<S>                       <C>                 <C>           <C>                 <C>
     1998                  $1,438              $1,916            $1,957           $2,013

     1997                      --              $  150            $1,039           $1,619
</TABLE>



(d)  The company's consolidated financial statements reflected recognition of a
     gain in the second quarter of 1998 arising from ORBIMAGE's issuance of
     warrants to purchase common stock. As reflected in the restated
     consolidated financial statements presented herein, since the warrants have
     not been exercised, the company has revised its accounting for this equity
     issuance, resulting in the elimination of its previously reported gain on
     issuance of affiliate equity by $4,793,000 in the second quarter of 1998.

(e)  Previously, the company's consolidated financial statements reflected the
     recognition of revenue related to the initial transfer of certain assets to
     ORBIMAGE in 1997 and sales under a procurement agreement with CCI in 1998.
     Additionally, the company did not previously reflect an increase in its
     deferred tax asset liabilities related to the ORBIMAGE transaction. As
     reflected in the restated financial statements, the company has revised its
     accounting for these transactions and the tax impact thereto, decreasing
     its reported revenues related to these sales. The effect in the 1998 and
     1997 quarters was to decrease revenues and operating income as follows
     (in thousands):


                                       55


<PAGE>   56

<TABLE>
<CAPTION>

                                March 31         June 30         September 30      December 30
<S>                            <C>               <C>             <C>               <C>
     Revenues
         1998                        --          $ 3,031           $1,032           $ 2,493
         1997                    $6,000          $52,539               --                --

     Operating Income
         1998                        --               --               --           $   596
         1997                    $  600          $18,869               --           $(5,000)
</TABLE>

     The tax impacts associated with this transaction resulted in an increase to
     the provision for income taxes of $10,898,000 in the second quarter of
     1997 to reflect deferred tax liabilities related to the investment basis
     differences.


(f)  The company's consolidated financial statements reflected the company's
     capitalization of interest expense on various assets, including on its
     equity investments in ORBIMAGE, ORBCOMM and CCI. As reflected in the
     restated consolidated financial statements presented herein, Orbital has
     not capitalized interest expense on its investment in ORBIMAGE and has
     revised the capitalization of interest on certain other assets, including
     its equity method investments in ORBCOMM and CCI. These revisions include
     the compounding impact of interest, and the reduction of eligible
     investment amounts for losses recognized for equity method investors.
     These revisions had the effect of increasing interest expense as follows
     (in thousands):

<TABLE>
<CAPTION>

                         March 31            June 30        September 30        December 30
<S>                     <C>                 <C>            <C>                 <C>
     1998                  $2,324              $  956            $1,220           $1,704

     1997                  $ (164)             $ (273)           $1,885           $1,017

</TABLE>


(g)  The company's consolidated financial statements did not reflect
     amortization of the excess of the company's investment in ORBIMAGE over
     the underlying share of the company's equity in those affiliates. As
     reflected in the restated consolidated financial statements, Orbital is
     amortizing such excess over eight years. This revision had the effect
     of increasing the company's equity in losses from affiliates as follows
     (in thousands):

<TABLE>
<CAPTION>

                            March 31            June 30        September 30        December 30
<S>                        <C>                 <C>            <C>                 <C>
     1998                     $89                 $89             $  88            $  89

     1997                      --                 $59              $(59)            $237
</TABLE>


(h)  The company's consolidated financial statements did not reflect the
     amortization of previously deferred profits in connection with its sales
     of both satellite and ground stations to ORBCOMM. As reflected in the
     restated consolidated financial statements presented herein, Orbital is
     amortizing a portion of such deferred profits over the estimated lives of
     both the satellites and the ground stations. The effect of this revision
     is to increase the company's equity in losses of affiliates by
     approximately $110,000 in each of the quarters in 1997 and the first
     three quarters in 1998, and by $968,000 in the fourth quarter of 1998.


                                       56

<PAGE>   57
Asset Restatement Adjustments
(i)  The company has historically capitalized and depreciated certain product
     enhancements and costs associated with internally developed software
     and certain other costs. Previously, the company's consolidated financial
     statements reflected such costs as capitalized assets. As reflected in the
     company's restated consolidated financial statements, the company expensed
     all previously capitalized enhancement costs and certain non-capitalizable
     costs. These revisions resulted in an  increase (decrease) in operating
     income as follows (in thousands):

<TABLE>
<CAPTION>

                            March 31            June 30        September 30      December 30
<S>                       <C>                  <C>            <C>               <C>
     1998                  $1,738               $ (774)            $(468)          $3,373

     1997                  $   29               $3,061             $ 507           $3,848

</TABLE>

     This also resulted in an increase in equity in losses of $770,000 in the
     third quarter of 1998.

Other Restatement and Reclassification Adjustments

(j)  Previously, the company's consolidated financial statements did not
     reflect a write-down in the book value of inventory at the company's
     Magellan subsidiary related to certain obsolete consumer products. The
     adjustment to record the write-down in inventory as reflected in the
     restated consolidated financial statements presented herein resulted in
     an increase to costs of goods sold of approximately $4,760,000, an
     increase in selling, general and administrative expenses of $324,000 and
     an increase in non-controlling interests of approximately $2,988,000 in
     the second quarter of 1998.

(k)  The company had previously amortized a portion of the goodwill arising from
     the acquisition of Ashtech as a direct charge against non-controlling
     interests. As reflected in the company's restated consolidated financial
     statements, the company is amortizing such goodwill as a charge to
     operations, resulting in an increase in goodwill amortization expense and
     an increase in non-controlling interests as follows (in thousands):

<TABLE>
<CAPTION>

                                    March 31        June 30        September 30      December 30
<S>                                <C>             <C>            <C>               <C>
     1998
       Goodwill amortization           $300            $301           $300              $301
       Non-controlling
       interests                       $102            $102           $102              $102
</TABLE>


(l)  The company's consolidated balance sheet at December 31, 1998 reflected a
     net deferred tax asset of approximately $3,400,000 relating primarily to
     Canadian investment tax credit carryforwards. The restated consolidated
     financial statements include a revised calculation of this deferred tax
     asset in 1998 by increasing  costs of goods sold and provision for income
     taxes by $542,000 and  $306,000 in each of the four quarters of 1998.

(m)  During the fourth quarter of 1998, the company reclassified a permanent
     impairment of $2,479,000 on a certain investment from costs of goods sold
     to asset impairment charges.

The company has recorded certain other adjustments, the net effect of which is
not significant individually or in the aggregate.

13. SUBSEQUENT EVENTS AND OTHER MATTERS

    Litigation. In the first quarter of 1999, a number of class action lawsuits
were filed in federal court in the Eastern District of Virginia against Orbital,
an officer and an officer/director, alleging violations of the federal
securities laws during the period from April 21, 1998 through February 16, 1999
and seeking monetary damages. In December 1998, Thomas van der Heyden filed a
lawsuit in the Circuit Court for Montgomery County, Maryland alleging that
Orbital is in actual or anticipatory breach of obligations allegedly imposed on
Orbital in a judgment in a previous action brought by plaintiff against CTA. The
plaintiff claims that he is entitled to a sum exceeding $30 million from
Orbital, as successor-in-interest to CTA. The company believes that the
allegations in the legal proceedings described above are without merit and
intends to vigorously defend against the allegations. In addition, under the
terms of the CTA acquisition, the company believes it is entitled to
indemnification from CTA for all or a part of any damages arising from the van
der Heyden litigation.

    Business Combinations. On March 12, 1999, Orbital and Magellan signed a
merger agreement with Lowrance Electronics, Inc., a leading manufacturer of
marine and recreational electronics using GPS-satellite navigation and sonar
technology. Under the terms of the merger, Orbital will acquire all the
outstanding common stock of Lowrance and Lowrance shareholders will receive
between 745,000 and 1,250,000 shares of Orbital common stock, based on the fair
market value of Orbital common stock prior to closing. Lowrance will be merged
into Magellan at the closing and Orbital's ownership of Magellan following the
merger will increase to



                                       57

<PAGE>   58
approximately 85%. The transaction is expected to close in the second half of
1999. Closing is subject to regulatory approval and Lowrance shareholder
approval.

    On March 18, 1999, MDA and Toronto-based Spar Aerospace Limited signed an
asset purchase agreement pursuant to which MDA will acquire Spar's space
robotics division for approximately $43,000,000 in cash, one half of which is
payable upon closing, with the other half payable a year following closing. The
acquisition will expand the company's product lines to include advanced robotics
primarily for the manned space market. Orbital expects the transaction to close
in the second quarter of 1999, subject to customary closing conditions.


ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
        FINANCIAL DISCLOSURE

    Not Applicable.

                                    PART III

ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

    The information required by this Item is included in Item 4A above and under
the caption "Election of Directors -- Directors to be Elected at the 1999 Annual
Meeting, -- Directors Whose Terms Expire in 2000 and -- Directors Whose Terms
Expire in 2001" and "Section 16(a) Beneficial Ownership Reporting Compliance" of
the Proxy Statement filed pursuant to Regulation 14A on or about March 29, 1999
and is incorporated herein by reference.

ITEM 11.  EXECUTIVE COMPENSATION

    The information required by this Item is included under the captions
"Summary Compensation Table," "Option Grants in Last Fiscal Year," "Aggregated
Option Exercises in Last Fiscal Year and Fiscal Year-End Option Values,"
"Indemnification Agreements," "Executive Employment Agreements" and "Information
Concerning the Board and Its Committees" of the Proxy Statement filed pursuant
to Regulation 14A on or about March 29, 1999 and is incorporated herein by
reference.

ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

    The information required by this Item is included under the caption
"Ownership of Common Stock" of the Proxy Statement filed pursuant to Regulation
14A on or about March 29, 1999 and is incorporated herein by reference.

ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

    The information required by this Item is included under the caption "Related
Transactions" of the Proxy Statement filed pursuant to Regulation 14A on or
about March 29, 1999 and is incorporated herein by reference.

                                     PART IV

ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

    (a) Documents filed as part of this Report:

    1. Financial Statements. The following financial statements, together with
the report of KPMG LLP are filed as a part of this report:

    A. Independent Auditors' Report

    B. Consolidated Statements of Earnings

    C. Consolidated Balance Sheets

    D. Consolidated Statements of Stockholders' Equity


                                       58
<PAGE>   59

    E. Consolidated Statements of Cash Flows

    F. Notes to Consolidated Financial Statements

    2. Financial Statements of 50-Percent Owned Subsidiary and Financial
Statement Schedules.

    The financial statements of ORBCOMM Global, L.P. are transmitted with this
report.

    The following additional financial data are transmitted with this report and
should be read in conjunction with the Consolidated Financial Statements
contained herein. Schedules other than those listed below have been omitted
because they are inapplicable or are not required.

    Independent Auditors' Report on Consolidated Financial Statements

    Schedule II -- Valuation and Qualifying Accounts

    3. Exhibits. A complete listing of exhibits required is given in the Exhibit
Index that precedes the exhibits filed with this report.

    (b) Reports on Form 8-K

        (i) On October 23, 1998, we filed a Current Report on Form 8-K, dated
    October 20, 1998, disclosing, under Item 5 our financial results for the
    fiscal quarter ending September 30, 1998.

        (ii) On November 2, 1998, we filed a Current Report on Form 8-K, dated
    October 30, 1998, disclosing under Item 5, the adoption of a stockholder
    rights plan.

    (c) See Item 14(a)(3) of this report.

    (d) See Item 14(a)(2) of this report.


                                       59

<PAGE>   60


                                    SIGNATURE


         Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.

Dated:  April 17, 2000      ORBITAL SCIENCES CORPORATION

                            By: /s/ DAVID W. THOMPSON
                               -------------------------------------------------
                                               David W. Thompson
                               Chairman of the Board and Chief Executive Officer



                                       60

<PAGE>   61

                          Independent Auditors' Report

The Board of Directors and Stockholders
Orbital Sciences Corporation:

Under date of February 16, 1999, except as to note 13, which is as of March 18,
1999, and note 1A, which is as of April 17, 2000, we reported on the
consolidated balance sheets of Orbital Sciences Corporation and subsidiaries as
of December 31, 1998 and 1997, and the related consolidated statements of
operations, stockholders' equity, and cash flows for each of the years in the
three-year period ended December 31, 1998, included in the Company's 1998 annual
report on Form 10-K/A. In connection with our audits of the aforementioned
consolidated financial statements, we also audited the related consolidated
financial statement schedule in the Company's 1998 Form 10-K/A. This
consolidated financial statement schedule is the responsibility  of the
Company's management. Our responsibility is to express an opinion on this
consolidated financial statement schedule based on our audits.

In our opinion, such consolidated financial statement schedule, when considered
in relation to the basic consolidated financial statements taken as a whole,
presents fairly, in all material respects, the information set forth therein.

The accompanying consolidated financial statement schedule as of December 31,
1998 and 1997, and for each of the years in the three-year period ended
December 31, 1998 has been restated.

                                             KPMG LLP

Washington, D.C.
February 16, 1999, except as to note 13,
   which is as of March 18, 1999, and
   note 1A, which is as of April 17, 2000



<PAGE>   62
                          ORBITAL SCIENCES CORPORATION
                SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
                FORM 10-K/A FOR THE YEAR ENDED DECEMBER 31, 1998
                             (AMOUNTS IN THOUSANDS)


<TABLE>
<CAPTION>
                 COLUMN A                        COLUMN B                  COLUMN C                COLUMN D        COLUMN E
- -------------------------------------------------------------------------------------------------------------------------------
                                                                           ADDITIONS
                                                             -----------------------------------
                                                                                   CHARGED/
                                               BALANCE AT    CHARGED TO COSTS    CREDITED TO                      BALANCE AT
               DESCRIPTION                  START OF PERIOD    AND EXPENSES    OTHER ACCOUNTS(1)  DEDUCTIONS(2)  END OF PERIOD
- -----------------------------------------   ---------------  ----------------  -----------------  -------------  --------------
<S>                                            <C>              <C>              <C>                <C>             <C>
YEAR ENDED DECEMBER 31, 1996

  Allowance for doubtful accounts              $     773        $     603        $     -            $      (8)      $   1,368
  Allowance for obsolete inventory                 3,778              667              685                (32)          5,098
  Allowance for unrecoverable investments          1,100              -                -                  -             1,100
  Deferred income tax valuation reserve           60,166              -                -               (5,734)         54,432


YEAR ENDED DECEMBER 31, 1997

  Allowance for doubtful accounts              $   1,368        $     709        $  16,550          $    (550)      $  18,077
  Allowance for obsolete inventory                 5,098            1,527            4,902               (627)         10,900
  Allowance for unrecoverable investments          1,100              729            3,057                -             4,886
  Deferred income tax valuation reserve           54,432           12,457              -                  -            66,889


YEAR ENDED DECEMBER 31, 1998

  Allowance for doubtful accounts              $  18,077        $   4,635        $     794          $  (1,936)      $  21,570
  Allowance for obsolete inventory                10,900            6,023            4,161            (12,869)          8,215
  Allowance for unrecoverable investments          4,886              552           (1,100)               -             4,338
  Deferred income tax valuation reserve           66,889           27,296              -                  -            94,185
</TABLE>


(1) - Amounts charged/credited to other accounts represent valuation and
      qualifying accounts recorded pursuant to purchase business combinations
      as described in Note 4 to the consolidated financial statements
      incorporated by reference elsewhere herein, and certain other
      reclassifications.

(2) - Deduction for revaluation of allowance account.

<PAGE>   63




                                  EXHIBIT INDEX

    The following exhibits are filed as part of this report. Where such filing
is made by incorporation by reference to a previously filed statement or report,
such statement or report is identified in parentheses.

            EXHIBIT
            NUMBER              DESCRIPTION OF EXHIBIT
            -------  -----------------------------------------------

               3.1  Restated Certificate of Incorporation (incorporated by
                    reference to Exhibit 4.1 to the company's Registration
                    Statement on Form S-3 (File Number 333-08769) filed and
                    effective on July 25, 1996).

               3.2  By-Laws of Orbital Sciences Corporation, as amended on July
                    27, 1995 (incorporated by reference to Exhibit 3 to the
                    company's Quarterly Report on Form 10-Q for the quarter
                    ended September 30, 1995).

               3.3  Certificate of Amendment to Restated Certificate of
                    Incorporation, dated April 29, 1997 (previously filed).

               3.4  Certificate of Designation, Preferences and Rights of Series
                    B Junior Participating Preferred Stock, dated November 2,
                    1998 (incorporated by reference to Exhibit 2 to the
                    company's Report on Form 8-A filed on November 2, 1998).

               4.1  Form of Certificate of Common Stock (incorporated by
                    reference to Exhibit 4.1 to the company's Registration
                    Statement on Form S-1 (File Number 33-33453) filed on
                    February 9, 1990 and effective on April 24, 1990).

               4.2  Indenture dated as of September 16, 1997 between the company
                    and Deutsche Bank AG, New York Branch, as Trustee
                    (incorporated by reference to Exhibit 4.1 to the company's
                    Quarterly Report on Form 10-Q for the quarter ended
                    September 30, 1997.

               4.3  First Supplemental Indenture dated as of December 15, 1997
                    between the company and Deutsche Bank AG, New York Branch,
                    as Trustee (incorporated by reference to Exhibit 4.4 to the
                    company's Registration Statement on Form S-3 (File Number
                    333-42271) filed on December 15, 1997 and effective on March
                    12, 1998).

               4.4  Form of 5% Convertible Subordinated Note (incorporated by
                    reference to Exhibit 4.5 to the company's Registration
                    Statement on Form S-3 (File Number 333-42271) filed on
                    December 15, 1997 and effective on March 12, 1998).

               4.5  Registration Rights Agreement dated as of September 16, 1997
                    among the company and Deutsche Morgan Grenfell Inc. and J.P.
                    Morgan Securities Inc. (incorporated by reference to Exhibit
                    4.6 to the company's Registration Statement on Form S-3
                    (File Number 333-42271) filed on December 15, 1997 and
                    effective on March 12, 1998).

               4.6  Rights Agreement dated as of October 22, 1998 between the
                    company and BankBoston N.A., as Rights Agent (incorporated
                    by reference to Exhibit 1 to the company's Report on Form
                    8-A filed on November 2, 1998).

               4.7  Form of Rights Certificate (incorporated by reference to
                    Exhibit 3 to the company's Report on Form 8-A filed on
                    November 2, 1998).

               10.1 Third Amended and Restated Credit Agreement, dated as of
                    December 21, 1998 among the company, Magellan Corporation,
                    the Banks listed therein, Morgan Guaranty Trust Company of
                    New York, as Administrative Agent and Collateral Agent (the
                    "Credit Agreement") (previously filed).

               10.2 Note Agreement, dated as of June 14, 1995 between the
                    company and The Northwestern Mutual Life Insurance Company
                    (the "NWML Note Agreement") (incorporated by reference to
                    Exhibit 4.7.1 to the company's Quarterly Report on Form 10-Q
                    for the quarter ended June 30, 1995).

             10.2.1 First Amendment to the NWML Note Agreement, dated as of
                    June 30, 1995, between the company and The Northwestern
                    Mutual Life Insurance Company (incorporated by reference to
                    the company's Quarterly Report on Form 10-Q for the quarter
                    ended September 30, 1995).

             10.2.2 Second Amendment to the NWML Note Agreement, dated as of
                    March 15, 1996 (incorporated by reference to Exhibit 10.2.2
                    to the company's Annual Report on Form 10-K for the fiscal
                    year ended December 31, 1995).

             10.2.3 Third Amendment to NWML Note Agreement, dated as of July
                    13, 1996 (incorporated by reference to Exhibit 10.2 to the
                    company's Quarterly Report on Form 10-Q for the quarter
                    ended June 30, 1996).

             10.2.4 Fourth Amendment to NWML Note Agreement, dated as of March
                    31, 1997 (incorporated by reference to Exhibit 10.2.4 to the
                    company's Quarterly Report on Form 10-Q for the quarter
                    ended March 31, 1997).

             10.2.5 Fifth Amendment to NWML Note Agreement, dated as of
                    December 23, 1997 (incorporated by reference to Exhibit
                    10.2.5 to the company's Annual Report on Form 10-K for the
                    fiscal year ended December 31, 1997).

             10.2.6 Sixth Amendment to NWML Note Agreement, dated as of August
                    14, 1998 (incorporated by reference to Exhibit 10.2.6 to the
                    company's Quarterly Report on Form 10-Q for the quarter
                    ended September 30, 1998).

               10.3 Promissory Notes dated as of August 31, 1994 made by
                    Fairchild Space and Defense Corporation and Corporate
                    Guaranty dated August 31, 1994 made by the company
                    (incorporated by reference to Exhibit 10.7 to the company's
                    Quarterly Report on Form 10-Q for the quarter ended
                    September 30, 1994).

               10.4 Amended and Restated Security Agreement dated as of August
                    5, 1997 among the


                                 61

<PAGE>   64

                    company, Morgan Guaranty Trust Company, as Collateral Agent,
                    and NationsBank, N.A., as Designated Lockbox Bank
                    (incorporated by Reference to Exhibit 10.4 to the company's
                    Quarterly Report on Form 10-Q for the quarter ended
                    September 30, 1997).

             10.4.1 Security Agreement dated as of August 5, 1997 among the
                    company, Morgan Guaranty Trust Company, as Collateral Agent,
                    and NationsBank, N.A., as Designated Lockbox Bank
                    (incorporated by Reference to Exhibit 10.4.1 to the
                    company's Quarterly Report on Form 10-Q for the quarter
                    ended September 30, 1997).

               10.5 Master Security Agreement dated as of August 31, 1994
                    between Fairchild Space and Defense Corporation and General
                    Electric Capital Corporation (incorporated by reference to
                    Exhibit 10.7 to the company's Quarterly Report on Form 10-Q
                    for the quarter ended September 30, 1994).

               10.6 Orbital Sciences Corporation 1990 Stock Option Plan,
                    restated as of April 27, 1995 (incorporated by reference to
                    Exhibit 10.5.1 to the company's Quarterly Report on Form
                    10-Q for the quarter ended June 30, 1995).*

               10.7 Orbital Sciences Corporation 1990 Stock Option Plan for
                    Non-Employee Directors, restated as of April 27, 1995
                    (incorporated by reference 10.7 to Exhibit 10.5.2 to the
                    company's Quarterly Report on Form 10-Q for the quarter
                    ended June 30, 1995).*

               10.8 Orbital Communications Corporation Restated 1992 Stock
                    Option Plan, restated as of September 12, 1995 (incorporated
                    by reference to Exhibit 10.8 to the company's Annual Report
                    on Form 10-K for the fiscal year ended December 31, 1995).

             10.8.1 Amendment to Orbital Communications Corporation Restated
                    1992 Stock Option Plan, dated February 5, 1997 (incorporated
                    by reference to Exhibit 10.8.1 to the company's Annual
                    Report on Form 10-K for the fiscal year ended December 31,
                    1996).*

               10.9 Orbital Sciences Corporation 1995 Deferred Compensation Plan
                    (incorporated by reference to Exhibit 10.9 to the company's
                    Annual Report on Form 10-K for the fiscal year ended
                    December 31, 1995).*

              10.10 Magellan Corporation 1996 Stock Option Plan (incorporated
                    by reference to Exhibit 10.3 to the company's Quarterly
                    Report on Form 10-Q for the quarter ended June 30, 1996).*

              10.11 Orbital Imaging Corporation 1996 Stock Option Plan
                    (incorporated by reference to Exhibit 10.11 to the company's
                    Annual Report on Form 10-K for the fiscal year ended
                    December 31, 1996).*

              10.12 Form of Executive Employment Agreement entered into between
                    the Company and Executive Officers and certain other
                    Officers of the Company (incorporated by reference to
                    Exhibit 10.17 to the company's Registration Statement on
                    Form S-1 (File Number 33-33453) filed on February 9, 1990
                    and effective on April 24, 1990).*

            10.12.1 Performance Share Agreement dated October 23, 1996
                    between the Company and Mr. D. W. Thompson (incorporated by
                    reference to Exhibit 10.12.1 to the company's Annual Report
                    on Form 10-K for the fiscal year ended December 31, 1996).*

            10.12.2 Amendment No. 1 to Performance Share Agreement dated
                    January 30, 1998 between the company and Mr. D.W. Thompson
                    (incorporated by reference to Exhibit 10.12.2 to the
                    company's Annual Report on Form 10-K for the fiscal year
                    ended December 31, 1997).*

              10.13 Form of Indemnification Agreement entered into between the
                    company and directors, executive Officers and certain other
                    officers of the company (incorporated by reference to
                    Exhibit 10.18 to the company's Registration Statement on
                    Form S-1 (File Number 33-33453) filed on February 9, 1990
                    and effective on April 24, 1990).*

            10.13.1 Amendment dated October 22, 1992 to form of
                    Indemnification Agreement entered into between the company
                    and directors, executive officers and certain other officers
                    of the company (incorporated by reference to Exhibit 19 to
                    the Company's Quarterly Report on Form 10-Q for the quarter
                    ended September 30, 1992).*

              10.15 Restated Master Agreement, dated as of September 12, 1995,
                    by and among the company, OCC, Teleglobe Inc. and Teleglobe
                    Mobile Partners (incorporated by reference to Exhibit 10 to
                    ORBCOMM Global L.P.'s Registration Statement on Form S-4
                    (File Number 333-11149) filed on August 30, 1996).

            10.15.1 Amendment No. 1 to Restated Master Agreement, restated as
                    of September 12, 1995, by and among the company, OCC,
                    Teleglobe Inc. and Teleglobe Mobile Partners filed on August
                    30, 1996 (incorporated by reference to Exhibit 10.15.1 to
                    the company's Quarterly Report on Form 10-Q for the quarter
                    ended March 31, 1997).

              10.16 Restated Agreement of Limited Partnership of ORBCOMM
                    Global, L.P., dated as of September 12, 1995, between OCC
                    and Teleglobe Mobile Partners (incorporated by reference to
                    Exhibit 3.2 to ORBCOMM Global L.P.'s Registration Statement
                    on Form S-4 (File Number 333-11149) filed on August 30,
                    1996).

            10.16.1 Amendment No. 1 to Restated Agreement of Limited
                    Partnership of ORBCOMM Global, L.P., dated December 2, 1996
                    (incorporated by reference to Exhibit 10.16.1 to the
                    company's Annual Report on Form 10-K for the fiscal year
                    ended December 31, 1996).

              10.17 Restated Agreement of Limited Partnership of ORBCOMM USA,
                    L.P., dated as of September 12, 1995 between Orbital
                    Communications Corporation and ORBCOMM Global (incorporated
                    by reference to Exhibit 3.4 to ORBCOMM Global L.P.'s
                    Registration Statement on Form S-4 (File Number 333-11149)
                    filed on August 30, 1996).

              10.18 Amended and Restated Orbital Sciences Corporation 1997
                    Stock Option and Incentive Plan (previously filed).

                                       62

<PAGE>   65

              10.19 Promissory Note dated June 27, 1997 from the company
                    payable to the order of General Electric Capital Corporation
                    ("GECC") (incorporated by reference to Exhibit 10.19 to the
                    company's Annual Report on Form 10-K for the fiscal year
                    ended December 31, 1997).
              10.20 Aircraft Security Agreement dated as of June 27, 1997 from
                    the company to GECC (incorporated by reference to Exhibit
                    10.20 to the company's Annual Report on Form 10-K for the
                    fiscal year ended December 31, 1997).
              10.21 1998 Magellan Stock Option Plan (previously filed).
              10.22 Letter Agreement between the company and Robert Lovell
                    dated July 28, 1997 (previously filed).*
              10.23 Form of 1998 Indemnification Agreement (previously filed).*
              10.24 Form of 1998 Executive Employment Agreement
                    (previously filed).*
                 11 Statement re: Computation of Earnings Per Share (not
                    required).
               13.1 ORBCOMM Global, L.P. financial statements (previously
                    filed).
                 21 Subsidiaries of the Company (previously filed).
               23.1 Consent of KPMG LLP (transmitted herewith).
               23.2 Consent of KPMG LLP (transmitted herewith).
                 27 Financial Data Schedule for year ended December 31, 1998
                    (such schedule is furnished for the information of the
                    Securities and Exchange Commission and is not to be deemed
                    "filed" as part of the Form 10-K, or otherwise subject to
                    the liabilities of Section 18 of the Securities Exchange Act
                    of 1934) (transmitted herewith).

- -------------
* Management Contract or Compensatory Plan or Arrangement.










                                       63

<PAGE>   1
                                                                    Exhibit 23.1


                              ACCOUNTANTS' CONSENT

The Board of Directors
Orbital Sciences Corporation and subsidiaries:

We consent to incorporation by reference in the registration statements on Forms
S-8 (Nos. 33-84296, 33-62277, 33-64517, 333-53585, 333-69887, 333-69885, and
333-27999) of Orbital Sciences Corporation and subsidiaries of our reports dated
February 16, 1999, except as to note 13 which is as of March 18, 1999, and note
1A which is as of April 17, 2000, relating to the consolidated balance sheets of
Orbital Sciences Corporation as of December 31, 1998 and 1997, and the related
consolidated statements of operations, stockholders' equity, and cash flows, and
the related consolidated financial statement schedule, for each of the years in
the three-year period ended December 31, 1998, which reports appear in the
December 31, 1998 annual report on Form 10-K/A of Orbital Sciences Corporation
and subsidiaries.

Our reports refer to the restatement of the consolidated balance sheets as of
December 31, 1998 and 1997, and the consolidated statements of operations,
stockholders' equity and cash flows, and the related consolidated financial
statement schedule, for each of the years in the three-year period ended
December 31, 1998.


                                                                        KPMG LLP

Washington, D.C.
April 17, 2000


<PAGE>   1
                                                                    Exhibit 23.2




                              Accountants' Consent


The Board of Directors
Orbital Sciences Corporation and subsidiaries:

We consent to the incorporation by reference in the registration statements on
Forms S-8 (Nos. 33-84296, 33-62277, 33-64517, 333-53585, 333-69887, 333-69885,
and 333-27999) of Orbital Sciences Corporation and subsidiaries of our report
dated March 30, 1999, relating to the consolidated balance sheets of ORBCOMM
Global, L.P. and subsidiaries as of December 31, 1998 and 1997, and the related
consolidated statements of operations and comprehensive loss, partners'
capital, and cash flows for each of the years in the three-year period ended
December 31, 1998, which report appears in the December 31, 1998 annual report
on Form 10-K/A of Orbital Sciences Corporation.



                                                                        KPMG LLP

Washington, DC
April 17, 2000

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEETS AND CONSOLIDATED STATEMENTS OF EARNINGS AT AND
FOR THE YEAR ENDED DECEMBER 31, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS
</LEGEND>
<CIK> 0000820736
<NAME> ORBITAL SCIENCES CORP /DE/
<MULTIPLIER> 1000

<S>                             <C>
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                                0
                                          0
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