GEOTEK COMMUNICATIONS INC
SC 13D/A, 1997-01-31
RADIO & TV BROADCASTING & COMMUNICATIONS EQUIPMENT
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 10)*

                           GEOTEK COMMUNICATIONS, INC.
                     -------------------------------------
                                (Name of Issuer)

                          Common Stock, $.01 Par Value
                      -----------------------------------
                         (Title of Class of Securities)

                                    373654102
                            -----------------------
                                 (CUSIP Number)

                              Stephen M. Vine, Esq.
                    Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                                 399 Park Avenue
                            New York, New York 10022
                                 (212) 872-1000
                 ----------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                January 23, 1997
                         -----------------------------
                      (Date of Event which Requires Filing
                               of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [_].

Check the following box if a fee is being paid with the statement  [_]**. (A fee
is not required only if the reporting  person:  (1) has a previous  statement on
file  reporting  beneficial  ownership of more than five percent of the class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7)

Note: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule 13d- 1(a) for other  parties to whom copies are to be
sent.


                         Continued on following page(s)
                               Page 1 of 81 Pages
                             Exhibit Index: Page 21

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

*       Initial  filing with respect to Winston  Partners,  L.P. and  Chatterjee
        Fund Management, L.P.

**      A filing  fee is not  being  paid with this  statement  pursuant  to SEC
        Release  No.  33-7331  whereby  the filing fee has been  eliminated  for
        Schedule 13D.


<PAGE>



                                  SCHEDULE 13D
CUSIP No. 373654102                                           Page 2 of 81 Pages

1       Name of Reporting Person
        S.S. or I.R.S. Identification No. of Above Person

               S-C RIG INVESTMENTS-III, L.P.

2       Check the Appropriate Box If a Member of a Group*
                                            a.  [_]
                                            b.  [X]

3       SEC Use Only

4       Source of Funds*

               WC

5       Check Box If Disclosure  of Legal  Proceedings  Is Required  Pursuant to
        Items 2(d) or 2(e) [_]

6       Citizenship or Place of Organization

               Delaware

                      7      Sole Voting Power
  Number of                         11,090,449
   Shares
Beneficially          8      Shared Voting Power
  Owned By                          0
    Each
  Reporting           9      Sole Dispositive Power
   Person                            11,090,449
    With
                      10     Shared Dispositive Power
                                    0

11      Aggregate Amount Beneficially Owned by Each Reporting Person

                                    11,090,449/1/

12      Check Box If the Aggregate Amount in Row (11) Excludes Certain Shares*
        [X]

13      Percent of Class Represented By Amount in Row (11)

                                    15.47%/1/

14      Type of Reporting Person*

        PN
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
- -------------

/1/     See Item 5. This  number  does not  include  certain  securities  of the
        Issuer of which the Reporting Person may be deemed the beneficial owner.


<PAGE>



                                  SCHEDULE 13D
CUSIP No. 373654102                                           Page 3 of 81 Pages

1       Name of Reporting Person
        S.S. or I.R.S. Identification No. of Above Person

               S-C RIG CO.

2       Check the Appropriate Box If a Member of a Group*
                                            a.  [_]
                                            b.  [X]

3       SEC Use Only

4       Source of Funds*

               AF

5       Check Box If Disclosure  of Legal  Proceedings  Is Required  Pursuant to
        Items 2(d) or 2(e) [_]

6       Citizenship or Place of Organization

               Delaware

                      7      Sole Voting Power
  Number of                         11,090,449
   Shares
Beneficially          8      Shared Voting Power
  Owned By                          0
    Each
  Reporting           9      Sole Dispositive Power
   Person                           11,090,449
    With
                      10     Shared Dispositive Power
                                    0

11      Aggregate Amount Beneficially Owned by Each Reporting Person

                                    11,090,449/1/

12      Check Box If the Aggregate Amount in Row (11) Excludes Certain Shares*
        [X]

13      Percent of Class Represented By Amount in Row (11)

                                    15.47%/1/

14      Type of Reporting Person*

        CO
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
- -------------

/1/     See Item 5. This  number  does not  include  certain  securities  of the
        Issuer of which the Reporting Person may be deemed the beneficial owner.


<PAGE>



                                  SCHEDULE 13D

CUSIP No. 373654102                                           Page 4 of 81 Pages

1       Name of Reporting Person
        S.S. or I.R.S. Identification No. of Above Person

               WINSTON PARTNERS, L.P.

2       Check the Appropriate Box If a Member of a Group*
                                            a.  [_]
                                            b.  [x]

3       SEC Use Only

4       Source of Funds*

               WC

5       Check Box If Disclosure  of Legal  Proceedings  Is Required  Pursuant to
        Items 2(d) or 2(e) [_]

6       Citizenship or Place of Organization

               Delaware

                      7      Sole Voting Power
  Number of                         170,000
   Shares
Beneficially          8      Shared Voting Power
  Owned By                             0
    Each
  Reporting           9      Sole Dispositive Power
   Person                           170,000
    With
                      10     Shared Dispositive Power
                                       0

11      Aggregate Amount Beneficially Owned by Each Reporting Person

                                    170,000/1/

12      Check Box If the Aggregate Amount in Row (11) Excludes Certain Shares*
        [X]

13      Percent of Class Represented By Amount in Row (11)

                             .28%/1/

14      Type of Reporting Person*

               PN
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
- -------------

/1/     See Item 5. This  number  does not  include  certain  securities  of the
        Issuer of which the Reporting Person may be deemed the beneficial owner.


<PAGE>



                                  SCHEDULE 13D

CUSIP No. 373654102                                           Page 5 of 81 Pages

1       Name of Reporting Person
        S.S. or I.R.S. Identification No. of Above Person

               CHATTERJEE FUND MANAGEMENT, L.P.

2       Check the Appropriate Box If a Member of a Group*
                                            a.  [_]
                                            b.  [X]

3       SEC Use Only

4       Source of Funds*

               AF

5       Check Box If Disclosure  of Legal  Proceedings  Is Required  Pursuant to
        Items 2(d) or 2(e) [_]

6       Citizenship or Place of Organization

               Delaware

                      7      Sole Voting Power
  Number of                         170,000
   Shares
Beneficially          8      Shared Voting Power
  Owned By                                  0
    Each
  Reporting           9      Sole Dispositive Power
   Person                           170,000
    With
                      10     Shared Dispositive Power
                                            0

11      Aggregate Amount Beneficially Owned by Each Reporting Person

                                    170,000/1/

12      Check Box If the Aggregate  Amount in Row (11) Excludes  Certain Shares*
        [x]

13      Percent of Class Represented By Amount in Row (11)

                             .28%/1/

14      Type of Reporting Person*

               PN
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
- -------------

/1/     See Item 5. This  number  does not  include  certain  securities  of the
        Issuer of which the Reporting Person may be deemed the beneficial owner.


<PAGE>



                                  SCHEDULE 13D
CUSIP No. 373654102                                           Page 6 of 81 Pages

1       Name of Reporting Person
        S.S. or I.R.S. Identification No. of Above Person

               WINSTON PARTNERS II LDC

2       Check the Appropriate Box If a Member of a Group*
                                            a.  [_]
                                            b.  [X]

3       SEC Use Only

4       Source of Funds*

               WC

5       Check Box If Disclosure  of Legal  Proceedings  Is Required  Pursuant to
        Items 2(d) or 2(e) [_]

6       Citizenship or Place of Organization

               Cayman Island

                      7      Sole Voting Power
  Number of                         214,171
   Shares
Beneficially          8      Shared Voting Power
  Owned By                          0
    Each
  Reporting           9      Sole Dispositive Power
   Person                            214,171
    With
                      10     Shared Dispositive Power
                                    0

11      Aggregate Amount Beneficially Owned by Each Reporting Person

                                    214,171/1/

12      Check Box If the Aggregate  Amount in Row (11) Excludes  Certain Shares*
        [X]

13      Percent of Class Represented By Amount in Row (11)

                                    .35%/1/

14      Type of Reporting Person*

        OO; IV

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
- -------------

/1/     See Item 5. This  number  does not  include  certain  securities  of the
        Issuer of which the Reporting Person may be deemed the beneficial owner.


<PAGE>



                                  SCHEDULE 13D
CUSIP No. 373654102                                           Page 7 of 81 Pages

1       Name of Reporting Person
        S.S. or I.R.S. Identification No. of Above Person

               WINSTON PARTNERS II LLC

2       Check the Appropriate Box If a Member of a Group*
                                            a.  [_]
                                            b.  [X]

3       SEC Use Only

4       Source of Funds*

               WC

5       Check Box If Disclosure  of Legal  Proceedings  Is Required  Pursuant to
        Items 2(d) or 2(e) [_]

6       Citizenship or Place of Organization

               Delaware

                      7      Sole Voting Power
  Number of                         106,965
   Shares
Beneficially          8      Shared Voting Power
  Owned By                          0
    Each
  Reporting           9      Sole Dispositive Power
   Person                           106,965
    With
                      10     Shared Dispositive Power
                                    0

11      Aggregate Amount Beneficially Owned by Each Reporting Person

                                    106,965/1/

12      Check Box If the Aggregate  Amount in Row (11) Excludes  Certain Shares*
        [X]

13      Percent of Class Represented By Amount in Row (11)

                                    .18%/1/

14      Type of Reporting Person*

        OO; IV

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
- -------------

/1/     See Item 5. This  number  does not  include  certain  securities  of the
        Issuer of which the Reporting Person may be deemed the beneficial owner.


<PAGE>



                                  SCHEDULE 13D
CUSIP No. 373654102                                           Page 8 of 81 Pages

1       Name of Reporting Person
        S.S. or I.R.S. Identification No. of Above Person

               CHATTERJEE ADVISORS LLC

2       Check the Appropriate Box If a Member of a Group*
                                            a.  [_]
                                            b.  [X]

3       SEC Use Only

4       Source of Funds*

               AF

5       Check Box If Disclosure  of Legal  Proceedings  Is Required  Pursuant to
        Items 2(d) or 2(e) [_]

6       Citizenship or Place of Organization

               Delaware

                      7      Sole Voting Power
  Number of                         321,136
   Shares
Beneficially          8      Shared Voting Power
  Owned By                          0
    Each
  Reporting           9      Sole Dispositive Power
   Person                           321,136
    With
                      10     Shared Dispositive Power
                                    0

11      Aggregate Amount Beneficially Owned by Each Reporting Person

                                    321,136/1/

12      Check Box If the Aggregate  Amount in Row (11) Excludes  Certain Shares*
        [X]

13      Percent of Class Represented By Amount in Row (11)

                                    .53%/1/

14      Type of Reporting Person*

        OO; IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
- -------------

/1/     See Item 5. This  number  does not  include  certain  securities  of the
        Issuer of which the Reporting Person may be deemed the beneficial owner.


<PAGE>



                                  SCHEDULE 13D
CUSIP No. 373654102                                           Page 9 of 81 Pages

1       Name of Reporting Person
        S.S. or I.R.S. Identification No. of Above Person

               CHATTERJEE MANAGEMENT COMPANY

2       Check the Appropriate Box If a Member of a Group*
                                            a.  [_]
                                            b.  [X]

3       SEC Use Only

4       Source of Funds*

               AF

5       Check Box If Disclosure  of Legal  Proceedings  Is Required  Pursuant to
        Items 2(d) or 2(e) [_]

6       Citizenship or Place of Organization

               Delaware

                      7      Sole Voting Power
  Number of                         321,136
   Shares
Beneficially          8      Shared Voting Power
  Owned By                          0
    Each
  Reporting           9      Sole Dispositive Power
   Person                           321,136
    With
                      10     Shared Dispositive Power
                                    0

11      Aggregate Amount Beneficially Owned by Each Reporting Person

                                    321,136/1/

12      Check Box If the Aggregate  Amount in Row (11) Excludes  Certain Shares*
        [X]

13      Percent of Class Represented By Amount in Row (11)

                                    .53%/1/

14      Type of Reporting Person*

        CO; IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
- -------------

/1/     See Item 5. This  number  does not  include  certain  securities  of the
        Issuer of which the Reporting Person may be deemed the beneficial owner.


<PAGE>



                                  SCHEDULE 13D
CUSIP No. 373654102                                          Page 10 of 81 Pages

1       Name of Reporting Person
        S.S. or I.R.S. Identification No. of Above Person

               PURNENDU CHATTERJEE

2       Check the Appropriate Box If a Member of a Group*
                                            a.  [_]
                                            b.  [X]

3       SEC Use Only

4       Source of Funds*

               AF

5       Check Box If Disclosure  of Legal  Proceedings  Is Required  Pursuant to
        Items 2(d) or 2(e) [X]

6       Citizenship or Place of Organization

               United States

                      7      Sole Voting Power  Number of
  Number of                         11,811,585
   Shares
Beneficially          8      Shared Voting Power
  Owned By                          0
    Each
  Reporting           9      Sole Dispositive Power
   Person                           11,811,585
    With
                      10     Shared Dispositive Power
                                    0

11      Aggregate Amount Beneficially Owned by Each Reporting Person

                                    11,811,585/1/

12      Check Box If the Aggregate  Amount in Row (11) Excludes  Certain Shares*
        [_]

13      Percent of Class Represented By Amount in Row (11)

                                     16.31%/1/

14      Type of Reporting Person*

        IA; IN

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
- -------------

/1/     See Item 5. This  number  does not  include  certain  securities  of the
        Issuer of which the Reporting Person may be deemed the beneficial owner.


<PAGE>


                                                             Page 11 of 81 Pages


               This  Amendment  No. 10 to Schedule  13D relates to the shares of
common stock,  $0.01 par value (the "Shares"),  of Geotek  Communications,  Inc.
(the "Issuer") and amends the initial  statement on Schedule 13D, dated November
9, 1993,  and all  subsequent  amendments  thereto  (collectively,  the "Initial
Statement").  This Amendment No. 10 is being filed by the Reporting  Persons (as
defined herein) to report the  acquisition by the Reporting  Persons (as defined
herein) of securities of the Issuer  convertible  into, or exercisable  for, the
Shares.  As more fully set forth herein,  this statement  constitutes an initial
statement  for  two  of  the  Reporting  Persons  which,  as  a  result  of  the
transactions  reported  herein,  may be  deemed  to be the  beneficial  owner of
Shares.  Capitalized  terms used  herein but not defined  herein  shall have the
meanings  ascribed to them in the Initial  Statement.  The Initial  Statement is
supplementally amended as follows:

Item 2.        Identity and Background.

               This statement is being filed on behalf of the following  persons
(collectively, the "Reporting Persons"):

               (i)    S-C Rig Investments-III, L.P. ("S-C Rig III");

               (ii)   S-C Rig Co. (the "General Partner");

               (iii)  Winston Partners, L.P. ("Winston L.P.");

               (iv)   Chatterjee Fund Management, L.P. ("CFM");

               (v)    Winston Partners II LDC ("Winston LDC");

               (vi)   Winston Partners II LLC ("Winston LLC");

               (vii)  Chatterjee Advisors LLC ("Chatterjee Advisors");

               (viii) Chatterjee  Management Company ("Chatterjee  Management");
and

               (ix)   Purnendu Chatterjee ("Dr. Chatterjee");

               This  statement  constitutes  an initial  filing with  respect to
Winston L.P. and CFM. This statement relates to securities held for the accounts
of S-C Rig III, Winston L.P., Winston LDC and Winston LLC.


                              The Reporting Persons

Winston L.P. and CFM
- --------------------

               Winston  L.P.  is  a  Delaware  limited   partnership   which  is
principally  engaged in  investing  in  securities.  CFM is a  Delaware  limited
partnership and the general  partner of Winston L.P. Dr.  Chatterjee is the sole
general partner of CFM. The principal business purpose of CFM is to serve as the
sole general  partner of Winston L.P. The  principal  office of Winston L.P. and
CFM is located at 888  Seventh  Avenue,  30th Floor,  New York,  New York 10106.


<PAGE>

                                                             Page 12 of 81 Pages

Pursuant to regulations promulgated under Section 13(d) of the 1934 Act, CFM, as
the sole  general  partner  of Winston  L.P.,  and Dr.  Chatterjee,  as the sole
general partner of CFM, each may be deemed a beneficial owner of securities held
for the account of Winston L.P.

               During the past five years, neither Winston L.P. nor CFM has been
(a) convicted in a criminal  proceeding,  or (b) a party to any civil proceeding
as a result of which he has been  subject to a  judgment,  decree or final order
enjoining future violations of, or prohibiting or mandating  activities  subject
to, federal or state  securities  laws, or finding any violation with respect to
such laws.

Item 3.        Source and Amount of Funds or Other Consideration.

               On  December  31,  1996 S-C Rig III,  Winston LDC and Winston LLC
entered into a letter agreement with the Issuer (the "Letter of Intent"), a copy
of which is attached hereto as Exhibit P and incorporated herein by reference in
response to this Item 3. Pursuant to the terms of the Letter of Intent,  S-C Rig
III,  Winston  LDC and  Winston LLC agreed in  principle  to  purchase  from the
Issuer,  subject  to  certain  conditions,  500  shares of Series P  Convertible
Preferred Stock, par value $0.01 per share, convertible into Shares (the "Series
P Stock"), and warrants to purchase an aggregate of 850,000 Shares at an initial
exercise price of $9.2625 per Shares,  subject to adjustment for certain capital
transactions (the "Series P Initial Warrants").

               On January 23, 1997, each of S-C Rig III, Winston LDC and Winston
LLC, as well as Winston L.P., entered into a Convertible Securities Subscription
Agreement (the  "Subscription  Agreement")  with the Issuer,  a copy of which is
attached hereto as Exhibit Q and incorporated herein by reference in response to
this Item 3,  pursuant to which each of the  Reporting  Persons  subscribed  for
Series P Stock and the Series P Initial Warrants.

               Pursuant to the terms of the Subscription Agreement:

          (i) S-C Rig III  expended  approximately  $15,000,000  of its  working
capital to purchase  300 Shares of Series P Stock and Series P Initial  Warrants
to purchase  510,000  Shares,  which are the only  securities of the Issuer that
have been purchased for its account over the last 60 days;

          (ii) Winston L.P.  expended  approximately  $5,000,000  of its working
capital to purchase  100 Shares of Series P Stock and Series P Initial  Warrants
to purchase  170,000  Shares,  which are the only  securities of the Issuer that
have been purchased for its account over the last 60 days;

          (iii)  Winston LDC expended  approximately  $3,666,667  of its working
capital  to  purchase  66 2/3  Shares  of  Series P Stock  and  Series P Initial
Warrants to purchase 113,333 Shares, which are the only securities of the Issuer
that have been purchased for its account over the last 60 days; and

          (iv)  Winston LLC  expended  approximately  $1,333,333  of its working
capital  to  purchase  33 1/3  Shares  of  Series P Stock  and  Series P Initial
Warrants to purchase 56,667 Shares,  which are the only securities of the Issuer
that have been purchased for its account over the last 60 days.

               The  Certificate  of  Designation  of the  Series  P  Stock  (the
"Certificate of Designation")  provides that until the fifth  anniversary of the
issuance  of the Series P Stock  (when the  Series P Stock  will be  mandatorily

<PAGE>


                                                             Page 13 of 81 Pages


converted into Shares), subject to certain restrictions, the holders of Series P
Stock may convert such Series P Stock into fully paid and nonassessable  Shares.
The Certificate of Designation provides that each share of the Series P Stock is
convertible into the number of Shares that may be purchased with the "Designated
Price" of such share of Series P Stock.  The Certificate of Designation  defines
Designated Price as $50,000 per share,  subject to certain  adjustments (none of
which are  currently  applicable).  The price per Share used for the  purpose of
determining the number of Shares that may be purchased with the Designated Price
under the  Certificate  of  Designation  is the  "Average  Stock  Price,"  which
generally equals the lowest daily  volume-weighted  average price of a Share for
the four trading days immediately  preceding the date of conversion.  Such price
is subject  to  certain  adjustments,  none of which are  currently  applicable,
depending  on the length of time that the Series P Stock has been held after the
issuance  thereof.  For the purposes of this  Schedule 13D, in  determining  the
amount of Shares into which the Series P Stock are  convertible,  an  assumption
will be made that the Average Stock Price is $6.50. This price  approximates the
recent trading price of Shares. Based on this price, which fluctuates on a daily
basis and is only an estimate  for the  purposes of this  filing,  each share of
Series P Stock would be convertible into approximately 7,692.31 Shares.

               The Common Stock Purchase  Warrant dated January 23, 1997 for the
Series P Initial  Warrants (the "Common Stock Purchase  Warrant") issued to each
of the Reporting  Persons  pursuant to the Subscription  Agreement,  in the form
attached hereto as Exhibit R and incorporated  herein by reference provides that
each such Series P Initial  Warrant may be exercised by the holder  thereof,  in
whole or in part, at any time at an exercise price of $9.2625 per Share, subject
to adjustment in the event of certain capital transactions by the Issuer.

               The securities held for the accounts of the Reporting Persons may
be held through margin  accounts  maintained  with brokers,  which extend margin
credit as and when required to open or carry  positions in its margin  accounts,
subject to applicable federal margin regulations,  stock exchange rules and such
firm's credit policies.  The positions which may be held in the margin accounts,
including the Shares,  are pledged as  collateral  security for the repayment of
debit balances in the respective accounts.

Item 4.        Purpose of Transaction.

               All of the Shares reported herein as having been acquired for the
accounts of the Reporting Persons were acquired for investment purposes. Neither
the Reporting Persons,  nor, to the best knowledge of the Reporting Persons, any
of the other  individuals  identified  in  response  to Item 2, has any plans or
proposals which relate to or would result in any of the  transactions  described
in  subparagraphs  (a)  through  (j) of Item 4 of Schedule  13D.  The  Reporting
Persons  reserve the right to acquire  additional  securities of the Issuer,  to
dispose of such securities at any time or to formulate other purposes, plans, or
proposals  regarding the Issuer or any of its  securities,  to the extent deemed
advisable in light of general  investment and trading  policies of the Reporting
Persons, market conditions or other factors.

Item 5.        Interest in Securities of the Issuer.

        (a) (i) Excluding the Series P Stock,  the aggregate number of Shares of
which each of S-C Rig III and the  General  Partner  may be deemed a  beneficial
owner is  11,090,449  (approximately  15.47% of the total number of Shares which
would be  outstanding  assuming the exercise or conversion by S-C Rig III of all
of the  convertible  securities  held for its  account,  except for the Series P
Stock). This number consists of (i) 4,444,450 Shares issuable upon conversion of
the Series H shares,  (ii) 851,064 Shares issuable upon conversion of the Series
I Shares,  (iii)  621,000  Shares  issuable  upon the  exercise  of the  621,000
Warrants, (iv) 4,210,526 Shares issuable upon exercise of the April Warrant, (v)
340,909  Shares  issuable  upon  conversion  of the Series N Shares held for the
account of S-C Rig III, (vi) 112,500  Shares  issuable upon exercise of the June
Warrants held for the account of S-C Rig III and (vii) 510,000  Shares  issuable
upon exercise of the 510,000 Series P Initial Warrants.

<PAGE>


                                                             Page 14 of 81 Pages

               Based on the  assumptions set forth in Item 3 with respect to the
Series P Stock,  which  are  incorporated  herein  by  reference,  assuming  the
conversion of all of the Series P Stock held for the account of S-C Rig III, the
aggregate  number of Shares of which each of S-C Rig III and the General Partner
may be deemed a  beneficial  owner is  13,398,142  (approximately  18.11% of the
total  number of Shares  which would be  outstanding  assuming  the  exercise or
conversion  by S-C Rig III of all of the  convertible  securities  held  for its
account).  This number  assumes the  conversion  of 300 shares of Series P Stock
into 2,307,693 Shares.

               (ii) Excluding the Series P Stock, the aggregate number of Shares
of which  each of  Winston  L.P.  and CFM may be  deemed a  beneficial  owner is
170,000  (approximately  .28% of the  total  number  of  Shares  which  would be
outstanding  assuming the exercise or conversion of all  convertible  securities
held for the  account of  Winston  L.P.,  except  for the Series P Stock).  This
number  represents the 170,000 Shares  issuable upon the exercise of the 170,000
Series P Initial Warrants held for the account of Winston L.P.

               Based on the  assumptions set forth in Item 3 with respect to the
Series P Stock,  which  are  incorporated  herein  by  reference,  assuming  the
conversion  of all of the Series P Stock held for the  account of Winston  L.P.,
the  aggregate  number of Share of which  each of  Winston  L.P.  and CFM may be
deemed a beneficial owner is 939,231 (approximately 1.53% of the total number of
Shares which would be outstanding assuming the exercise or conversion by Winston
L.P. of all of the  convertible  securities  held for its account).  This number
assumes the conversion of 100 shares of Series P Stock into 769,231 Shares.

               (iii)  Excluding  the  Series P Stock,  the  aggregate  number of
Shares  of which  Winston  LDC may be  deemed  a  beneficial  owner  is  214,171
(approximately  .35% of the total  number of Shares  which would be  outstanding
assuming the exercise or conversion of all  convertible  securities held for the
account of Winston LDC, except for the Series P Stock).  This number consists of
(i) 75,818 Shares  issuable upon  conversion of the Series N Shares held for its
account, (ii) 25,020 Shares issuable upon exercise of the June Warrants held for
its account,  and (iii) 113,333 Shares issuable upon the exercise of the 113,333
Series P Initial Warrants.

               Based on the  assumptions set forth in Item 3 with respect to the
Series P Stock, which are incorporated herein by reference, assuming the
conversion of all of the Series P Stock held for the account of Winston LDC, the
aggregate number of Shares of which Winston LDC may be deemed a beneficial owner
is 726,992  (approximately  1.19% of the total  number of Shares  which would be
outstanding  assuming  the exercise or  conversion  by Winston LDC of all of the
convertible securities held for its account). This number assumes the conversion
of 6 2/3 shares of Series P Stock into 512,821 Shares.

               (iv) Excluding the Series P Stock, the aggregate number of Shares
of which Winston LLC may be deemed a beneficial owner is 106,965  (approximately
 .18% of the total  number of Shares  which  would be  outstanding  assuming  the
exercise or conversion  of all  convertible  securities  held for the account of
Winston LLC, except for the Series P Stock).  This number consists of (i) 37,818
Shares  issuable  upon  conversion  of the Series N Shares held for its account,
(ii) 12,480  Shares  issuable  upon  exercise of the June  Warrants held for its
account, and (iii) 56,667 Shares issuable upon the exercise of the 56,667 Series
P Initial Warrants.

<PAGE>

                                                             Page 15 of 81 Pages


               Based on the  assumptions set forth in Item 3 with respect to the
Series P Stock,  which  are  incorporated  herein  by  reference,  assuming  the
conversion of all of the Series P Stock held for the account of Winston LLC, the
aggregate  number of Shares of which may be deemed a beneficial owner is 363,375
(approximately  .59% of the total  number of Shares  which would be  outstanding
assuming the  exercise or  conversion  by Winston LLC of all of the  convertible
securities  held for its account).  This number assumes the conversion of 33 1/3
shares of Series P Stock into 256,410 Shares.

               (v) Excluding the Series P Stock,  the aggregate number of Shares
of which each of Chatterjee  Advisors and Chatterjee  Management may be deemed a
beneficial  owner is 321,136  (approximately  .53% of the total number of Shares
which  would  be  outstanding   assuming  the  exercise  or  conversion  of  all
convertible  securities  held for the  accounts of Winston LDC and Winston  LLC,
except for the Series P Stock). This number consists of (i) 214,171 Shares which
Winston LDC may be deemed to own  beneficially,  and (ii)  106,965  Shares which
Winston LLC may be deemed to own beneficially.

               Based on the  assumptions set forth in Item 3 with respect to the
Series P Stock,  which  are  incorporated  herein  by  reference,  assuming  the
conversion of all of the Series P Stock held for the accounts of Winston LDC and
Winston LLC, the aggregate number of Shares of which each of Chatterjee Advisors
and  Chatterjee  Management  may be  deemed  a  beneficial  owner  is  1,090,367
(approximately  1.77% of the total number of Shares  which would be  outstanding
assuming the  exercise or  conversion  by S-C Rig III of all of the  convertible
securities  held for its  account).  This number  assumes the  conversion of 100
shares of Series P Stock held for the  accounts  of Winston  LLC and Winston LDC
into 769,231 Shares.

               (vi) Excluding the Series P Stock, the aggregate number of Shares
of  which  Dr.  Chatterjee  may be  deemed  a  beneficial  owner  is  11,811,585
(approximately  16.31% of the total number of Shares which would be  outstanding
assuming the exercise or conversion of all  convertible  securities of which Dr.
Chatterjee may be deemed the beneficial  owner,  except for the Series P Stock).
This number consists of (i) 11,090,449  Shares which S-C Rig III and the General
Partner may be deemed to own  beneficially,  (ii) 30,000  Shares  issuable  upon
exercise  of  the  options  held  directly  for  the  personal  account  of  Dr.
Chatterjee,  (iii) 200,000 Shares  issuable upon exercise of the options held by
XTEC, (iv) 321,136 Shares which  Chatterjee  Advisors and Chatterjee  Management
may be deemed to own  beneficially,  and (v) the 170,000 Shares of which Winston
L.P. and CFM may be deemed to own beneficially.

               Based on the  assumptions set forth in Item 3 with respect to the
Series P Stock,  which  are  incorporated  herein  by  reference,  assuming  the
conversion  of all of the Series P Stock held for the  accounts  of S-C Rig III,
Winston  L.P.,  Winston LDC and Winston LLC, the  aggregate  number of Shares of
which  Dr.   Chatterjee   may  be  deemed  a  beneficial   owner  is  15,657,740
(approximately  20.54% of the total number of Shares which would be  outstanding
assuming the  exercise or  conversion  by S-C Rig III of all of the  convertible
securities  held for its  account).  This number  assumes the  conversion of 500
shares of Series P Stock held for the  accounts  of S-C Rig III,  Winston  L.P.,
Winston LDC and Winston LLC into 3,846,155 Shares.

        (b) (i) Each of S-C Rig III and the  General  Partner  has sole power to
vote and dispose of the Shares  issuable upon the  conversion or exercise of the
all of the convertible  securities reported herein as being held for the account
of S-C Rig III.

<PAGE>

                                                             Page 16 of 81 Pages

               (ii) Each of  Winston  L.P.  and CFM has the sole power to direct
the voting  and  disposition  of the  Shares  issuable  upon the  conversion  or
exercise of the all of the convertible  securities reported herein as being held
for the account of Winston L.P.

               (iii)  Winston  LDC has  sole  power to  direct  the  voting  and
disposition of the Shares issuable upon the conversion or exercise of the all of
the convertible securities reported herein as being held for its account.

               (iv)  Winston  LLC has  sole  power  to  direct  the  voting  and
disposition of the Shares issuable upon the conversion or exercise of the all of
the convertible securities reported herein as being held for its account.

               (v) Each of Chatterjee Advisors and Chatterjee Management has the
sole power to direct the voting and  disposition of the Shares issuable upon the
conversion or exercise of the all of the convertible  securities reported herein
as being held for the accounts Winston LDC and Winston LLC.

               (vi) Dr.  Chatterjee  may be  deemed  to have  the sole  power to
direct the voting and  disposition of the Shares issuable upon the conversion or
exercise of the all of the convertible  securities reported herein as being held
for the accounts of S-C Rig III, Winston L.P., Winston LDC and Winston LLC.

               Dr.  Chatterjee also may be deemed to have the sole power to vote
and dispose of the 230,000  Shares  issuable upon exercise of the 30,000 options
held directly by him and the 200,000 options held by XTEC.

        (c)  Except  as  disclosed  in  Item  3 and  Item  6  hereof,  which  is
incorporated  by  reference  in this Item 5,  there  have  been no  transactions
effected  with respect to the Shares  since  November 30, 1996 (60 days prior to
the date hereof) by any of the Reporting Persons.

        (d) (i) The partners of S-C Rig III,  including Tivadar  Charitable Lead
Trust,  created  under  agreement  dated 9/30/82 by Mr. George Soros as grantor,
have the right to participate in the receipt of dividends from, or proceeds from
the sale of, the  securities  described  herein as being held for the account of
S-C Rig III in accordance with their partnership interests in S-C Rig III.

               (ii) The partners of Winston L.P.  have the right to  participate
in the receipt of dividends  from, or proceeds from the sale of, the  securities
described  herein as being held for the account of Winston  L.P.  in  accordance
with their partnership interests in Winston L.P.

               (iii) The shareholders of each of Winston LDC,  including Winston
Partners II Offshore  Ltd.,  a British  Virgin  Islands  international  business
corporation,  and  Winston LLC have the right to  participate  in the receipt of
dividends from, or proceeds from the sale of, the securities described herein as
being held for the account each of Winston LDC and Winston LLC, respectively, in
accordance with their ownership interests in Winston LDC and Winston LLC.

               (iv) Dr. Chatterjee has the sole right to receive dividends from,
or proceeds from the sale of, the 30,000 options  described herein as being held
directly for his personal account.

<PAGE>

                                                             Page 17 of 81 Pages


               (v) The shareholders of XTEC, including Dr. Chatterjee,  have the
right to receive  dividends  from,  or  proceeds  from the sale of, the  200,000
options  described  herein as being held for the account XTEC in accordance with
their ownership interests in XTEC.

          (e) Not Applicable.


Item 6.        Contracts,  Arrangements,  Understandings  in  Relationship  with
               Respect to Securities of the Issuer.

               In connection with its acquisition of securities reported herein,
certain of the Reporting Persons entered into the following agreements,  each of
which is  incorporated  herein by reference:  (i) the Letter of Intent  attached
hereto as Exhibit P, (ii) the Subscription  Agreement attached hereto as Exhibit
Q, (iii) the  Common  Stock  Purchase  Warrant  in the form  attached  hereto as
Exhibit R, (iv) a Registration  Rights  Agreement dated January 23, 1997 between
the Issuer,  S-C Rig III,  Winston  L.P.,  Winston LDC and Winston LLC  attached
hereto as  Exhibit S (the  "Registration  Rights  Agreement"),  and (v) a Letter
Agreement  dated  January 23,  1997  between the Issuer and each of S-C Rig III,
Winston L.P., Winston LDC and Winston LLC in the form attached hereto as Exhibit
T (the "Letter Agreement").

               The Letter of Intent,  the Subscription  Agreement and the Common
Stock  Purchase  Warrant are  described in Item 3 hereto and such  disclosure is
incorporated herein by reference;  however,  such disclosure is qualified in its
entirely by reference  to the  specific  provisions  of such  agreements,  which
provisions are incorporated herein by reference.

               The Letter Agreement  contains certain agreements between each of
S-C Rig III, Winston L.P., Winston LDC and Winston LLC and the Issuer concerning
transactions  in the securities of the Issuer.  The Letter  Agreement  generally
provides,  among other things, that unless the Issuer and holders of at least 66
2/3% of the Series P Stock otherwise  agree,  each holder of Preferred Stock may
convert, in the aggregate,  not more than a limited percentage of Series P Stock
held by such holder.  The percentages to which each holder are limited are based
on the  number  of days  that  have  passed  after  December  31,  1996 and such
percentages  are set forth in  Exhibit T hereto and are  incorporated  herein by
reference.

               The  Letter   Agreement   also   provides  for  certain   trading
restrictions on the Series P Stock. It provides that if the market price for the
Shares is below a certain  price for five  consecutive  trading  days,  that the
Issuer  may,  at its  option,  provide  the  holders  of the Series P Stock with
written notice of a "Trading  Restriction Period" during which holders of Series
P Stock would be  restricted  from engaging in trades  involving the Shares.  In
addition, the Letter Agreement provides that in the event the Issuer commences a
firmly underwritten  public offering of its Shares and so requests,  the holders
of the Series P Stock will refrain from engaging in any trades  involving Shares
issued  pursuant to a conversion of the Series P Stock or exercise of the Series
P Initial Warrants.  The Letter Agreement also includes certain other provisions
affecting  transactions  in the  securities  of the  Issuer,  principally  those
involving  compliance with securities laws and the  Hart-Scott-Rodino  Antitrust
Improvements  Act of 1976, as amended.  All of such provisions are  incorporated
herein by reference.

               The Registration Rights Agreement entered into in connection with
the  acquisition  of the  Series  P Stock  and the  Series  P  Initial  Warrants
obligates the Issuer to have the Shares  underlying such  securities  registered
within a certain period of time. The Registration Rights Agreement provides that
the Issuer shall file and use its best efforts to cause to become effective,  as
promptly as possible,  but in any event by the 90th  calendar day after  January
23, 1997 a  registration  statement on Form S-3 under the Act or, if Form S-3 is

<PAGE>

                                                             Page 18 of 81 Pages

not then  available,  another  appropriate  form  covering  the resale of Shares
issuable  upon  conversion  of the Series P Stock and upon the  exercise  of the
Series P Initial Warrants.

               The  Registration  Rights  Agreement  contains  other  provisions
relating to registration procedures,  indemnification and contribution and other
miscellaneous matters, all of which are incorporated herein by reference.

               From  time  to  time,  each of the  Reporting  Persons  may  lend
portfolio securities to brokers,  banks or other financial  institutions.  These
loans  typically  obligate  the borrower to return the  securities,  or an equal
amount of securities of the same class, to the lender and typically provide that
the  borrower  is entitled to  exercise  voting  rights and to retain  dividends
during  the term of the  loan.  From  time to time to the  extent  permitted  by
applicable  laws,  the Reporting  Persons may borrow  securities,  including the
Shares, for the purpose of effecting,  and may effect,  short sale transactions,
and may purchase  securities  for the purpose of closing out short  positions in
such securities.

               Except  as  disclosed   above,  and  except  for  the  agreements
described  in the  Initial  Statement,  the  Reporting  Persons  do not have any
contracts,  arrangements,  understandings  or relationships  with respect to any
securities of the Issuer.


Item 7.        Material to be Filed as Exhibits.

               O. Joint Filing  Agreement,  dated as of January 29, 1997, by and
among S-C Rig III, the General Partner,  Winston L.P., CFM, Winston LDC, Winston
LLC, Chatterjee Advisors, Chatterjee Management and Purnendu Chatterjee.

               P. Letter  Agreement  dated  December 31, 1996 between the Issuer
and S-C Rig III, Winston LDC and Winston LLC.

               Q. Form of the  Subscription  Agreement  dated  January  23, 1997
entered into between the Issuer and each of S-C Rig III,  Winston L.P.,  Winston
LDC and Winston LLC.

               R. Form of the Common Stock  Purchase  Warrant  issued to each of
S-C Rig III, Winston L.P., Winston LDC and Winston LLC.

               S.  Registration  Rights Agreement dated January 23, 1997 between
the Issuer and S-C Rig III, Winston L.P., Winston LDC and Winston LLC.

               T. Form of the Letter  Agreement  dated  January 23, 1997 between
the Issuer and each of S-C Rig III, Winston L.P., Winston LDC and Winston LLC.

<PAGE>

                                                             Page 19 of 81 Pages



                                   SIGNATURES

               After  reasonable  inquiry  and to the best of my  knowledge  and
belief,  the  undersigned  certifies  that  the  information  set  forth in this
statement is true, complete and correct.


January 29, 1997                   S-C RIG INVESTMENTS-III, L.P.

                                   By:  S-C RIG CO., its General Partner


                                        By:  /S/ PETER HURWITZ
                                             ----------------------------------
                                             Peter Hurwitz
                                             Vice President


                                   S-C RIG CO.


                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Vice President


                                   WINSTON PARTNERS, L.P.

                                   By:  Chatterjee Fund Management, L.P.,
                                        its General Partner

                                        By:  Purnendu Chatterjee,
                                             its General Partner


                                             By:  /S/ PETER HURWITZ
                                                  -----------------------------
                                                  Peter Hurwitz
                                                  Attorney-in-Fact


                                   CHATTERJEE FUND MANAGEMENT, L.P.

                                   By:  Purnendu Chatterjee,
                                        its General Partner



                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Attorney-in-Fact

<PAGE>

                                                             Page 20 of 81 Pages


                                   WINSTON PARTNERS II LDC


                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Attorney-in-Fact


                                   WINSTON PARTNERS II LLC

                                   By:  Chatterjee Advisors LLC, its Manager


                                        By:  /S/ PETER HURWITZ
                                             ----------------------------------
                                             Peter Hurwitz
                                             Manager


                                   CHATTERJEE ADVISORS LLC


                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Manager


                                   CHATTERJEE MANAGEMENT COMPANY



                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Vice President


                                   PURNENDU CHATTERJEE


                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Attorney-in-Fact

<PAGE>

                                                             Page 21 of 81 Pages


                                INDEX OF EXHIBITS

EXHIBIT                                                                    PAGE
- -------                                                                    ----
  O.   Joint Filing Agreement,  dated as of January 29, 1997, by and 
       among S-C Rig  Investments-III,  L.P.,  S-C Rig Co.,  Winston
       Partners,  L.P.,  Chatterjee Fund Management,  L.P.,  Winston
       Partners  II  LDC,  Winston   Partners  II  LLC,   Chatterjee
       Advisors  LLC,  Chatterjee  Management  Company and  Purnendu
       Chatterjee.                                                          22
 
  P.   Letter  Agreement  dated December 31, 1996 between the Issuer
       and S-C Rig-III  Investments,  L.P.,  Winston Partners II LDC
       and Winston Partners II LLC.                                         24

  Q.   Form of the  Subscription  Agreement  dated  January 23, 1997
       entered  into  between  the  Issuer  and each of S-C  Rig-III
       Investments,  L.P., Winston Partners,  L.P., Winston Partners
       II LDC and Winston Partners II LLC.                                  28

  R.   Form of the Common Stock  Purchase  Warrant issued to each of
       S-C Rig III  Investments,  L.P.,  , Winston  Partners,  L.P.,
       Winston Partners II LDC and Winston Partners II LLC.                 46

  S.   Registration  Rights Agreement dated January 23, 1997 between
       the Issuer, S-C Rig-III Investments,  L.P., Winston Partners,
       L.P., Winston Partners II LDC and Winston Partners II LLC.           62

  T.   Form of the Letter  Agreement  dated January 23, 1997 between
       the  Issuer  and  each  of  S-C  Rig-III  Investments,  L.P.,
       Winston Partners,  L.P.,  Winston Partners II LDC and Winston
       Partners II LLC.                                                     78




                                                             Page 22 of 81 Pages


                                    EXHIBIT O

               The  undersigned  hereby agree that the statement on Schedule 13D
with respect to the Common Stock of Geotek  Communications,  Inc., dated January
29, 1997 is, and any amendments  thereto signed by each of the undersigned shall
be, filed on behalf of us pursuant to and in accordance  with the  provisions of
Rule 13d-1(f) under the Securities Exchange Act of 1934.


January 29, 1997                   S-C RIG INVESTMENTS-III, L.P.

                                   By:  S-C RIG CO., its General Partner


                                        By:  /S/ PETER HURWITZ
                                             ----------------------------------
                                             Peter Hurwitz
                                             Vice President


                                   S-C RIG CO.


                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Vice President


                                   WINSTON PARTNERS, L.P.

                                   By:  Chatterjee Fund Management, L.P.,
                                        its General Partner

                                        By:  Purnendu Chatterjee,
                                             its General Partner


                                             By:  /S/ PETER HURWITZ
                                                  -----------------------------
                                                  Peter Hurwitz
                                                  Attorney-in-Fact


                                   CHATTERJEE FUND MANAGEMENT, L.P.

                                   By:  Purnendu Chatterjee,
                                        its General Partner



                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Attorney-in-Fact

<PAGE>

                                                             Page 23 of 81 Pages


                                   WINSTON PARTNERS II LDC


                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Attorney-in-Fact


                                   WINSTON PARTNERS II LLC

                                   By:  Chatterjee Advisors LLC, its Manager


                                        By:  /S/ PETER HURWITZ
                                             ----------------------------------
                                             Peter Hurwitz
                                             Manager


                                   CHATTERJEE ADVISORS LLC


                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Manager


                                   CHATTERJEE MANAGEMENT COMPANY



                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Vice President


                                   PURNENDU CHATTERJEE


                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Attorney-in-Fact




                                                             Page 24 of 81 Pages


                                    EXHIBIT P




                                               December 31, 1996




Geotek Communications, Inc.
20 Craig Road
Montvale, New Jersey  07645

Attention:  Yaron I. Bitan, President

     Re:       500  shares  of Series P  Convertible  Preferred  Stock,  $50,000
               liquidation preference per share (the "Series P Stock"),  created
               pursuant to a Certificate of Designation in respect of the Series
               P Stock (the "Series P Certificate of Designation")
               ----------------------------------------------------------------

 Gentlemen:

               Geotek  Communications,  Inc.  (the  "Company"),  has today  sold
(including  all  related  transactions,  the  "Series  O  Sale")  to a group  of
institutional   investors  led  by  Promethean  Investment  Group,  L.L.C.  (the
"Promethean  Investors"),  1,000  shares of its Series O  Convertible  Preferred
Stock,  $50,000 liquidation  preference per share (the "Series O Stock"), for an
aggregate  purchase  price of $50  million.  As part of the  Series O Sale,  the
Company  delivered  Warrants  (the  "Initial  Warrants") to purchase 1.7 million
shares of its common stock, per value $.01 per share (the "Common  Stock"),  and
entered into a Convertible Securities Purchase Agreement,  dated the date hereof
(the "Purchase  Agreement"),  a  registration  rights  agreement  dated the date
hereof (the "Registration  Rights Agreement"),  and a side letter dated the date
hereof (the "Side  Letter").  The  Certificate  of Designation in respect of the
Series O Stock (the  "Series O  Certificate  of  Designation"),  the warrants to
purchase shares of Common Stock attached  thereto (the  "Redemption  Warrants"),
the Initial Warrant,  the Registration Rights Agreement,  the Purchase Agreement
and the Side Letter are attached hereto and are herein  collectively  called the
"Series O Documentation".

               The Company and S-C Rig Investments - III, L.P., Winston Partners
II LLC, and Winston Partners II LDC (collectively the "Buyers"), hereby agree as
follows:

1.  Subject to the terms and conditions hereof, on January 23, 1997, the Company
    shall sell (including all related transactions,  the "Series P Sale") to the
    Buyers, and the Buyers shall purchase from the Company,

    (a)     500 shares of Series P Stock, and

<PAGE>

                                                             Page 25 of 81 Pages


    (b)     a warrant  (the  "Series P Initial  Warrant")  to  purchase  850,000
            shares of Common  Stock at an initial  exercise  price  equal to the
            initial exercise price of the Initial Warrant.

    The aggregate purchase price for the shares of Series P Stock and the Series
    P Initial Warrant is $25 million.

2.  In connection  with the Series P Sale, the parties shall execute and deliver
    to each other a Convertible  Securities Purchase  Agreement,  a Registration
    Rights Agreement (the "Series P Registration  Rights  Agreement") and a side
    letter   (collectively,   with  the  Series  P  Certificate  of  Designation
    (including  the  warrants   attached   thereto  (the  "Series  P  Redemption
    Warrants")) and the Series P Initial Warrant, the "Series P Documentation").

3.  The terms of the Series P Sale (including the Series P Documentation)  shall
    be,  in  Buyers'  reasonable  judgment,  substantially  the same as those in
    respect  of the Series O Sale  (determined  without  regard to  clauses  (a)
    through (g), inclusive, below), including, the Series O Documentation,  and,
    in addition, shall:

     (a)       provide  that  restrictions  on  conversion  pursuant to Sections
               13(b)  and (c) of the  Series O  Certificate  of  Designation  be
               restrictions only on trading;

     (b)       provide  a  mechanic,   acceptable   to  Buyers,   to  facilitate
               compliance with the Hart-Scott- Rodino Antitrust Improvements Act
               of 1976, as amended, in respect of the conversion of the Series P
               Stock and exercise of all related warrants;

     (c)       eliminate  any  reference  to  a  limitation  on  the  amount  of
               securities the Buyers or their affiliates may own;

     (d)       amend the earlier  registration  rights  agreements  to which the
               Buyers or their  affiliates  are parties to include  Common Stock
               which  Buyers may acquire upon  conversion  of the Series P Stock
               and exercise of the related  warrants and include in the Series P
               Registration  Rights Agreement all other  registrable  securities
               covered by earlier  registration  rights  agreements to which the
               Buyers or their affiliates are parties;

     (e)       include in the definition of Registrable Securities in the Series
               P  Registration   Rights   Agreement  Common  Stock  received  as
               dividends on the Series P Stock;

     (f)       provide  that  the  time  periods  comparable  to  those  in  the
               definition of Conversion  Date Market Price and in paragraph 3 of
               the Side Letter run from the date hereof; and

     (g)       provide  that  the  Series  P  Initial   Warrants  and  Series  P
               Redemption  Warrants adjust in respect of transactions  occurring
               after the date  hereof but before  their  issuance as if they had
               been issued on the date hereof.


<PAGE>

                                                             Page 26 of 81 Pages


4.  The Company hereby represents and warrants to the Buyers that:

     (a)       It is duly  authorized to enter into this  Agreement  with Buyers
               and that the same constitutes the valid and binding  agreement of
               the Company and is enforceable  against the Company in accordance
               with its terms except for the  enforcement of equitable  remedies
               and as enforcement may be affected by insolvency laws;

     (b)       The execution  and delivery by the Company of this  Agreement and
               the consummation thereby of the transactions  contemplated hereby
               or by the Series P Documentation will not

               i)   result  in a  breach  or  violation  of the  Certificate  of
                    Incorporation or By laws of the Company,

               ii)  results in a violation  of law or the rules and  regulations
                    of any self-governing body applicable to the Company;

               iii) result in a breach  (or give rise to a right to  terminate),
                    whether  with the giving of notice or lapse of time or both,
                    any   agreement   to  which  the   Company  or  any  of  its
                    subsidiaries is a party; and

               iv)  require the consent or approval of any person or entity, the
                    absence of which would  likely  result in a material  advise
                    effect on the business,  prospects or financial condition of
                    the Company; and

     (c)       True  and  correct  copies  of the  Series  O  Documentation  are
               attached  hereto.  The  Series O  Documentation  constitutes  all
               agreements and understandings in respect of the Series O Sale and
               the transactions contemplated thereby.


                                   Very truly yours,

                                   S-C RIG INVESTMENTS - III, L.P.

                                   By:  S-C Rig Co.,
                                        its general partners

                                        By:  /S/ PETER HURWITZ
                                             ----------------------------------
                                             Peter Hurwitz

<PAGE>

                                                             Page 27 of 81 Pages




                                   WINSTON PARTNERS II LLC

                                   By:  Chatterjee Advisors L.L.C.,
                                        its Manager

                                        By:  /S/ PETER HURWIT
                                             ----------------------------------
                                             Peter Hurwitz, Manager


                                   WINSTON PARTNERS II LDC

                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Attorney-in-fact

Accepted and agreed to:

GEOTEK COMMUNICATIONS, INC.


By:  _______________________






                                    EXHIBIT Q

                  CONVERTIBLE SECURITIES SUBSCRIPTION AGREEMENT

This Convertible  Securities  Subscription  Agreement (the "Agreement") has been
executed by the undersigned  (the  "Subscriber")  in connection with the sale of
certain shares of Series P Convertible  Preferred Stock,  $.01 par value, and an
initial  Designated  Price (as defined in the  Certificate of  Designation  with
respect  thereto)  of  $50,000  per share  (the  "Preferred  Stock"),  of Geotek
Communications,  Inc., a Delaware corporation (the "Company"),  convertible into
shares of Common Stock, $.01 par value (the "Common Stock"), of the Company. The
rights and preferences of the Preferred Stock,  including the terms on which the
Preferred  Stock may be  converted  into  Common  Stock and the terms of certain
warrants  issuable in connection with the Company's  redemption of the Preferred
Stock,  are set  forth in the  Certificate  of  Designation  attached  hereto as
Exhibit A (the  "Certificate  of  Designation")  which shall have been executed,
- ---------
acknowledged,  filed,  recorded  and become  effective  in  accordance  with the
General  Corporation Law of the State of Delaware prior to the acceptance by the
Company of this Agreement.  The terms of certain warrants (collectively with the
warrants  issuable in connection with the Company's  redemption of the Preferred
Stock, the "Warrants") issuable in connection with the issuance of the Preferred
Stock are set forth in Exhibit A-1 attached  hereto.  The  solicitation  of this
                       -----------
Agreement and, if accepted by the Company, the offer and sale of Preferred Stock
and  Warrants,  are being made in reliance  upon the  provisions of Regulation D
("Regulation D") promulgated by the Securities and Exchange  Commission  ("SEC")
under the United  States  Securities  Act of 1933,  as amended (the  "Securities
Act"),  or under the  provisions  of Section  4(2) of the  Securities  Act.  The
Preferred  Stock,  the Warrants and the Common Stock issuable upon conversion or
exercise thereof are sometimes collectively referred to in this Agreement as the
"Securities."  The Common Stock issuable upon  conversion of the Preferred Stock
and upon  exercise of the Warrants is sometimes  referred to as the  "Underlying
Stock." The Subscriber wishes to subscribe for the number of shares of Preferred
Stock  and at the  aggregate  purchase  price  set  forth in  Section  13 and in
accordance  with  the  other  terms  and  conditions  of  this  Agreement,   the
Certificate of Designation and the Registration Rights Agreement attached hereto
as  Exhibit  B.  In  consideration  of  the  mutual  promises,  representations,
    ----------
warranties and  conditions  set forth herein,  and intending to be legally bound
hereby, the Company and the Subscriber agree as follows:

1.        Agreement to Subscribe; the Subscriber

1.1       Purchase and Issuance of Preferred Stock and Warrants.  The Subscriber
          ----------------------------------------------------- 
          hereby  subscribes  for the  number of shares of  Preferred  Stock and
          Warrants at the aggregate  purchase price set forth in Section 13. The

<PAGE>


                                                             Page 29 of 81 Pages

          closing of the purchase of such shares of Preferred Stock and Warrants
          (the "Closing")  shall occur on January 23, 1997 or such other date as
          the Company and the  Subscriber  shall agree (the "Closing  Date") and
          shall be deemed to have occurred when (i) a copy of the Certificate of
          Designation  as filed and  certified by the  Secretary of State of the
          State of Delaware  has been  delivered  to the  Subscriber,  (ii) this
          Agreement and the Registration Rights Agreement have been executed and
          delivered by both the Subscriber  and the Company,  (iii) the purchase
          price has been delivered by the Subscriber to the Company (in same day
          funds via wire transfer pursuant to instructions  previously delivered
          for such purpose),  and (iv)  certificates  representing the shares of
          Preferred Stock and Warrants subscribed for hereby have been delivered
          by the Company to Subscriber.

1.2       Nature of the  Subscriber.  The Subscriber is purchasing the Preferred
          -------------------------
          Stock for its own account and the  Subscriber  represents and warrants
          that it is an  "Accredited  Investor"  as that term is defined in Rule
          501 of Regulation D.

1.3       Conditions  Precedent  to the  Obligation  of the Company to Issue and
          ----------------------------------------------------------------------
          Sell the Preferred Stock and Warrants. The obligation hereunder of the
          -------------------------------------     
          Company to issue and/or sell the  Preferred  Stock and Warrants to the
          Subscriber is subject to the  satisfaction,  at or before the Closing,
          of each of the  conditions set forth below.  These  conditions are for
          the  Company's  sole  benefit  and may be waived by the Company at any
          time in its sole discretion.

(a)            Accuracy of the Subscriber's  Representations and Warranties. The
               ------------------------------------------------------------
               representations  and warranties of the  Subscriber  shall be true
               and correct as of the date when made and as of the  Closing  Date
               as though made at each such time.

(b)            Performance  by  the  Subscriber.   The  Subscriber   shall  have
               --------------------------------   
               performed,  satisfied  and  complied  in all  respects  with  all
               covenants,  agreements and conditions  required by this Agreement
               to be performed,  satisfied or complied with by the Subscriber at
               or prior to the Closing.

(c)            No Injunction.  No statute,  rule,  regulation,  executive order,
               -------------
               decree,  ruling or injunction  shall have been enacted,  entered,
               promulgated or endorsed by any court or governmental authority of
               competent   jurisdiction  or  any  stock  exchange,   interdealer
               quotation  system  or  other  self-regulatory  organization  with
               jurisdiction  over the Company or its securities  which prohibits
               or adversely affects any of the transactions contemplated by this

<PAGE>

                                                             Page 30 of 81 Pages

               Agreement, nor shall any proceeding have been commenced which may
               have the effect of prohibiting or adversely  affecting any of the
               transactions contemplated by this Agreement.

(d)            Side Letter Agreement.  The Company and the Subscriber shall have
               ---------------------
               entered  into  a  letter  agreement  in  substantially  the  form
               attached hereto as Exhibit C concerning block trade sales,  short
                                  ---------
               sale transactions and certain other matters.

1.4       Conditions  Precedent to the  Obligation of the Subscriber to Purchase
          the Preferred  Stock and Warrants.  The  obligation of the  Subscriber
          hereunder to purchase the Preferred  Stock from the Company is subject
          to  the  satisfaction,  at or  before  the  Closing,  of  each  of the
          conditions set forth below.  These conditions are for the Subscriber's
          sole  benefit and may be waived by the  Subscriber  at any time in its
          sole discretion.

(a)            Accuracy of the Company's  Representations  and  Warranties.  The
               -----------------------------------------------------------
               representations  and  warranties of the Company shall be true and
               correct  as of the date when made and as of the  Closing  Date as
               though made at each such time.

(b)            Performance  by the Company.  The Company  shall have  performed,
               ---------------------------
               satisfied  and  complied  in all  respects  with  all  covenants,
               agreements  and  conditions  required  by  this  Agreement  to be
               performed,  satisfied or complied with by the Company at or prior
               to the Closing.

(c)            No Injunction.  No statute,  rule,  regulation,  executive order,
               -------------
               decree,  ruling or injunction  shall have been enacted,  entered,
               promulgated or endorsed by any court or governmental authority of
               competent  jurisdiction  which prohibits or adversely affects any
               of the transactions contemplated by this Agreement, nor shall any
               proceeding  have  been  commenced  which  may have the  effect of
               prohibiting  or  adversely  affecting  any  of  the  transactions
               contemplated by this Agreement.

(d)            Adverse Changes.  Since September 30, 1996, no event which had or
               --------------- 
               is  likely to have a  Material  Adverse  Effect  (as  defined  in
               Section 3.5 below) on the Company has occurred.

(e)            No Suspension of Trading in or Delisting of Common Stock. Trading
               --------------------------------------------------------
               in the Common  Stock shall not have been  suspended by the SEC or

<PAGE>


                                                             Page 31 of 81 Pages

               the Nasdaq National  Market  ("Nasdaq" or the "Exchange") and the
               Common Stock shall not have been delisted from the Exchange.

(f)            Legal Opinion. The Company shall have delivered to the Subscriber
               -------------
               the  opinion of Messrs.  Klehr,  Harrison,  Harvey,  Branzburg  &
               Ellers,  independent counsel to the Company, in substantially the
               form attached hereto as Exhibit D.
                                       ---------

(g)            Officer's  Certificate.  The Company shall have  delivered to the
               ---------------------- 
               Subscriber  a  certificate  in  form  and  substance   reasonably
               satisfactory to the Subscriber,  executed by an executive officer
               of the  Company,  to the effect  that all the  conditions  to the
               Closing shall have been satisfied as of the Closing Date.

(h)            Filing of the  Certificate  of  Designation.  The  Certificate of
               -------------------------------------------
               Designation,  conforming  to the terms of this  Agreement,  shall
               have been duly filed with the  Secretary of State of the State of
               Delaware and a certified  copy thereof shall have been  delivered
               to the Subscriber.

(i)            Registration  Rights  Agreement.  The Company and the  Subscriber
               -------------------------------
               shall have entered into the Registration  Rights Agreement in the
               form attached as Exhibit B.
                                ---------

2.        Representations and Warranties of Subscriber

          The Subscriber represents and warrants to the Company that:

2.1       No Government  Recommendation or Approval.  The Subscriber understands
          -----------------------------------------
          that no United States federal or state agency or similar agency of any
          other  country,   has  passed  upon  or  made  any  recommendation  or
          endorsement of the Company or the offering of the Securities.

2.2       Intent.  The  Subscriber  is  purchasing  the  Securities  for its own
          ------
          account  and not with a view  towards  distribution  in  violation  of
          securities  laws,  and  the  Subscriber  has  no  present  arrangement
          (whether or not legally binding) at any time to sell the Securities to
          or through any person or entity; provided, however, that by making the
          representations  herein,  the  Subscriber  does not  agree to hold the
          Securities  for any minimum or other  specific  term and  reserves the
          right to  dispose of the  Securities  at any time in  accordance  with

<PAGE>


                                                             Page 32 of 81 Pages

          federal and state securities laws applicable to such disposition.  The
          Subscriber  has been advised of or is aware of the  provisions of Rule
          144 promulgated under the Securities Act.

2.3       Sophisticated Investor. The Subscriber is a sophisticated investor (as
          ----------------------
          defined  in Rule  506(b)(2)(ii)  of  Regulation  D) and an  accredited
          investor  (as  defined  in Rule  501 of  Regulation  D),  and has such
          experience  in business  and  financial  matters that it is capable of
          evaluating  the merits and risks of an investment  in the  Securities.
          The Subscriber  acknowledges  that the Securities are  speculative and
          involve a high degree of risk. The Subscriber  understands  that there
          is no established  market for the Preferred  Stock or the Warrants and
          that no public market therefor is foreseen.

2.4       Independent  Investigation.  The Subscriber, in making its decision to
          --------------------------
          purchase the Securities  subscribed for hereunder,  has relied upon an
          independent  investigation made by it and/or its  representatives  and
          has not relied on any  information  or  representations  made by third
          parties or on any oral or written  representations  or assurances from
          the Company or any representative or agent of the Company,  other than
          as set forth in this  Agreement,  in the public filings of the Company
          and in the documents  described below.  Prior to the date hereof,  the
          Subscriber  has been  furnished  with and has reviewed  the  Company's
          Annual  Report on Form 10- K for the period  ended  December  31, 1995
          (the "1995 Form  10-K")  sent to the  Company's  shareholders  and all
          documents  filed by the Company with the SEC since  December 31, 1995,
          pursuant  to  sections  13(a),  13(c),  14 or 15(d) of the  Securities
          Exchange  Act of 1934,  as amended  (the  "Exchange  Act")  (excluding
          preliminary proxy statement  filings) (such documents are collectively
          referred  to  in  this  Agreement  as  the  "Exchange  Act  Reports"),
          including,  without limitation, the Company's Reports on Form 10-Q for
          the periods  ended March 31,  1996,  June 30, 1996 and  September  30,
          1996,  as filed  with the SEC on May 10,  1996,  August  14,  1996 and
          November  14,  1996,  respectively,   and  a  copy  of  the  Company's
          Registration  Statement on Form S-3  declared  effective by the SEC on
          September 30, 1996. The Subscriber has had a reasonable opportunity to
          ask questions of and receive  answers from the Company  concerning the
          Company and the offering of the Securities contemplated hereby.

2.5       Authority.  This  Agreement  has  been  duly  authorized  and  validly
          executed and  delivered by the  Subscriber  and is a valid and binding
          agreement  enforceable  against the Subscriber in accordance  with its
          terms,  subject to general  principles  of equity and to bankruptcy or
          other laws affecting the enforcement of creditors' rights generally.


<PAGE>


                                                             Page 33 of 81 Pages


2.6       No Legal Advice From Company. The Subscriber  acknowledges that it has
          ----------------------------
          had the  opportunity  to review this  Agreement  and the  transactions
          contemplated  by this  Agreement  with its own legal  counsel  and tax
          advisors.  The  Subscriber  is  relying  solely  on such  counsel  and
          advisors and not on any statements or  representations  of the Company
          or any of its  representatives  or agents for legal, tax or investment
          advice with respect to this investment.

2.7       No Broker. The Subscriber has taken no action which would give rise to
          ---------
          any claim by any person for  brokerage  commission,  finder's  fees or
          similar  payments by the Company  relating  to this  Agreement  or the
          transactions contemplated hereby.

2.8       [Intentionally Omitted]

2.9       Reliance on Representations and Warranties. The Subscriber understands
          ------------------------------------------ 
          that the  Securities  are being  offered and sold to it in reliance on
          specific provisions of United States federal and state securities laws
          and that the  Company is relying  upon the truth and  accuracy  of the
          representations,    warranties,   agreements,    acknowledgments   and
          understandings  of the Subscriber set forth in this Agreement in order
          to determine the applicability of such provisions.

2.10      Transfer  or Resale.  The  Subscriber  understands  that (i) except as
          ------------------- 
          provided in the Registration Rights Agreement, the Securities have not
          been and are not  being  registered  under the  Securities  Act or any
          state  securities  laws,  and  may  not  be  transferred   unless  (a)
          subsequently  registered  thereunder or (b) the Subscriber  shall have
          delivered  to the  Company an opinion of counsel  (which  opinion  and
          counsel shall be  reasonably  acceptable to the Company) to the effect
          that  the  Securities  to be  sold  or  transferred  may  be  sold  or
          transferred pursuant to an exemption from such registration;  (ii) any
          sale of such Securities made in reliance on Rule 144 promulgated under
          the  Securities  Act may be made only in accordance  with the terms of
          said Rule and further,  if said Rule is not applicable,  any resale of
          such Securities under circumstances in which the seller (or the person
          through whom the sale is made) may be deemed to be an underwriter  (as
          that term is defined in the  Securities  Act) may  require  compliance
          with some other  exemption  under the  Securities Act or the rules and
          regulations of the SEC  thereunder;  and (iii) neither the Company nor
          any other person is under any  obligation to register such  Securities
          under the  Securities  Act or any state  securities  laws or to comply
          with the terms and  conditions  of any exemption  thereunder  (in each
          case, other than pursuant to the Registration Rights Agreement).


<PAGE>


                                                             Page 34 of 81 Pages


2.11      Legends.  The  Subscriber   understands  that  the  Preferred  Shares,
          -------
          Warrants  and,  until  such  time as the  Underlying  Stock  has  been
          registered   under  the  Securities   Act,  as   contemplated  by  the
          Registration  Rights  Agreement  or  otherwise  may  be  sold  by  the
          Subscriber  pursuant  to Rule 144  under  the  Securities  Act (or any
          successor  rule thereto)  without any  restriction as to the number of
          securities  acquired  hereunder that can then be immediately sold, the
          certificates for the Underlying  Stock, may bear a restrictive  legend
          in substantially the following form (and a stop-transfer  order may be
          placed against transfer of the certificates for such Securities):

               "The  securities  represented by this  certificate  have not been
          registered  under  the  Securities  Act  of  1933,  as  amended.   The
          securities  have been  acquired  for  investment  and may not be sold,
          transferred  or assigned in the absence of an  effective  registration
          statement for the securities under said Act, or an opinion of counsel,
          in form,  substance  and scope  reasonably  acceptable to the Company,
          that registration is not required under said Act."

               The legend set forth above shall be removed and the Company shall
issue a certificate without such legend to the holder of any Security upon which
it is stamped,  if, unless otherwise  required by state securities laws, (a) the
sale of such Security is registered  under the Securities Act or (b) such holder
provides the Company with an opinion of counsel,  in form,  substance  and scope
reasonably  acceptable  to the  Company,  to the  effect  that a public  sale or
transfer of such Security may be made without  registration under the Securities
Act or (c) such holder provides the Company with reasonable assurances that such
Security  can be sold  pursuant  to Rule  144  under  the  Securities  Act (or a
successor rule thereto)  without any  restriction as to the number of Securities
acquired  as of a  particular  date  that  can  then be  immediately  sold.  The
Subscriber  agrees to sell all  Securities,  including  those  represented  by a
certificate(s)  from which the  legend  has been  removed,  in  compliance  with
applicable  securities  law. In the event the above  legend is removed  from any
Security,  the Company may, upon  reasonable  advance notice to the  Subscriber,
require that the above legend be placed on any Security that cannot then be sold
pursuant to an effective registration statement or Rule 144 under the Securities
Act (or any successor rule thereto)  without any restriction as to the number of
securities acquired hereunder that can then be immediately sold.

3.      Representations and Warranties of the Company

        The Company represents and warrants to the Subscriber that:


<PAGE>


                                                             Page 35 of 81 Pages


3.1       Company  Status.  The Company has registered its Common Stock pursuant
          --------------- 
          to Section 12(b) or 12(g) of the Exchange  Act, is in full  compliance
          with all reporting  requirements  of the Exchange Act, and the Company
          has  maintained  all  requirements  for the  continued  listing of its
          Common  Stock,  and such  Common  Stock  is  currently  listed  on the
          Exchange,  which  Exchange is the  principal  market for the Company's
          Common Stock.

3.2       Current  Public  Information.  The  Exchange  Act Reports are the only
          ----------------------------
          filings  made by the  Company  since  December  31,  1995  pursuant to
          Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act.

3.3       No General  Solicitation  in Regard to this  Transaction.  Neither the
          --------------------------------------------------------  
          Company nor any of its  affiliates  nor any  distributor or any person
          acting on its or their behalf has conducted  any general  solicitation
          (as that  term is used in  Regulation  D) with  respect  to any of the
          Securities,  nor have they made any offers or sales of any security or
          solicited  any offers to buy any  security  under  circumstances  that
          would require the  registration of the Securities under the Securities
          Act.

3.4       Capitalization;  Valid  Issuance of Preferred  Stock and Common Stock.
          ---------------------------------------------------------------------
          The Company  has an  authorized  capitalization  set forth on Schedule
                                                                        --------
          3.4. Except as set forth on Schedule 3.4, no shares of Preferred Stock
          ---
          or options,  warrants or other  securities  convertible or exercisable
          into Common Stock have been issued or are outstanding. The Company has
          issued  and  outstanding  that  number of  shares of Common  Stock and
          preferred stock of various  series,  as set forth on Schedule 3.4, and
                                                               ------------ 
          all such shares have been duly and validly  authorized and issued, are
          fully  paid  and  non-assessable;  prior  to  the  Closing  Date,  the
          authorized capitalization shall include the Securities;  upon issuance
          of the  Securities,  the Securities  will be duly and validly  issued,
          fully paid and  non-assessable;  the Underlying Stock, when issued and
          delivered  in  accordance   with  the  terms  of  the  Certificate  of
          Designation,   will  be  duly  and  validly  issued,  fully  paid  and
          non-assessable;  and, except as set forth on Schedule 3.4 hereto,  the
                                                       ------------ 
          holders of outstanding  capital stock of the Company are not and shall
          not be entitled to preemptive or other rights  afforded by the Company
          to subscribe for the  Securities or the  Underlying  Stock.  As of the
          Closing  Date,  the Company shall have duly filed the  Certificate  of
          Designation,  and all of the rights, preferences and privileges of the
          Preferred   Stock  shall  be  as  set  forth  in  the  Certificate  of
          Designation,  a copy of which,  certified by the Secretary of State of
          the State of  Delaware,  shall be delivered  to the  Subscriber  on or
          before the Closing Date.


<PAGE>


                                                             Page 36 of 81 Pages


3.5       Organization  and  Qualification.  The Company is a  corporation  duly
          --------------------------------
          incorporated and existing in good standing under the laws of the State
          of  Delaware  and  has  the  requisite  corporate  power  to  own  its
          properties  and to carry on its business as now being  conducted.  The
          Company  does  not  have  any  subsidiaries,  except  as set  forth on
          Schedule  3.5.  The  Company is duly  qualified  to do  business  as a
          -------------
          foreign  corporation and is in good standing in every  jurisdiction in
          which the nature of the  business  conducted  or property  owned by it
          makes  such  qualification  necessary  other  than  those in which the
          failure  so to  qualify  would  not have a  Material  Adverse  Effect.
          "Material  Adverse  Effect" means any material  adverse  effect on the
          business, operations,  properties,  prospects of the entity taken as a
          whole,  or the  consolidated  financial  condition  of the entity with
          respect  to which  such  term is used,  or with  respect  to any other
          entity  controlled  by such entity,  and/or any condition or situation
          which would  prohibit or otherwise  interfere  with the ability of the
          entity  with  respect  to which  said  term is used to  enter  into or
          perform its  obligations  under this  Agreement,  the  Certificate  of
          Designation or the Registration Rights Agreement.

3.6       Authorization;   Enforcement.   (i)  The  Company  has  the  requisite
          ---------------------------- 
          corporate power and authority to enter into and perform this Agreement
          and the  Registration  Rights  Agreement  and to issue the  Securities
          subject to the limitations  and conditions  contained in and otherwise
          in  accordance  with  the  terms  hereof  and  of the  Certificate  of
          Designation,  the Warrants and the Side Letter, (ii) the execution and
          delivery of this Agreement by the Company and the  consummation  by it
          of the transactions contemplated hereby including, without limitation,
          the issuance of the Underlying Stock (based on the conversion price in
          effect on the date hereof), have been duly authorized by all necessary
          corporate  action,  and no  further  consent or  authorization  of the
          Company or its Board of Directors or stockholders  is required,  (iii)
          this Agreement and the  Registration  Rights  Agreement have been duly
          executed and delivered by the Company, and (iv) this Agreement and the
          Registration  Rights  Agreement   constitute  the  valid  and  binding
          obligations  of  the  Company   enforceable  against  the  Company  in
          accordance with their terms,  except (x) as such enforceability may be
          limited by applicable bankruptcy, insolvency, or similar laws relating
          to, or affecting  generally the enforcement of,  creditors' rights and
          remedies or by other equitable  principles of general  application and
          (y) as rights to indemnity or  contribution  may be limited by federal
          and state securities laws and public policy considerations.

3.7.      Corporate  Documents.  The Company has furnished or made  available to
          --------------------
          the Subscriber true and correct copies of the Company's Certificate of

<PAGE>

                                                             Page 37 of 81 Pages

          Incorporation as in effect on the date hereof (the "Certificate"), and
          the  Company's  By-Laws,   as  in  effect  on  the  date  hereof  (the
          "By-Laws").

3.8       No  Conflicts.  The  execution,   delivery  and  performance  of  this
          -------------
          Agreement and the Registration Rights Agreement by the Company and the
          consummation by the Company of the  transactions  contemplated  hereby
          and thereby including,  without limitation, the issuance of any of the
          Securities or the Underlying  Stock (based on the conversion  price in
          effect  on the  date  hereof),  do not and will  not (i)  result  in a
          violation of the  Certificate  or By-Laws or (ii)  conflict  with,  or
          constitute a default (or an event which,  with notice or lapse of time
          or both,  would become a default)  under, or give to others any rights
          of  termination,  amendment,  acceleration  or  cancellation  of,  any
          agreement,  indenture or instrument to which the Company or any of its
          subsidiaries  is a party,  or result  in a  violation  of any  federal
          state,  local or foreign law,  rule,  regulation,  order,  judgment or
          decree  (including  Federal and state securities laws and regulations)
          applicable to the Company or any of its  subsidiaries  or by which any
          property or asset of the Company or any of its  subsidiaries  is bound
          or  affected  (except  for  such  conflicts,  defaults,  terminations,
          amendments, accelerations,  cancellations and violations as would not,
          individually  or in the aggregate,  have a Material  Adverse  Effect);
          provided  that,  for  purposes of such  representation  as to Federal,
          state, local or foreign law, rule or regulation,  no representation is
          made herein with respect to any of the same  applicable  solely to the
          Subscriber and not to the Company.  The business of the Company is not
          being  conducted in violation of any law,  ordinance or regulations of
          any governmental  entity,  except for possible violations which either
          singly or in the aggregate do not and will not have a Material Adverse
          Effect. The Company is not required under Federal, state or local law,
          rule or  regulation  in the United  States to obtain any consent which
          has not been  obtained,  or  authorization  or order  of,  or make any
          filing or registration with, any court or governmental agency in order
          for it to  execute,  deliver or perform any of its  obligations  under
          this Agreement or issue and sell the Securities in accordance with the
          terms  hereof  and  thereof  (other  than  any  SEC,  Nasdaq  or state
          securities  filings  in  connection  with this  offering  which may be
          required to be made by the Company subsequent to the Closing,  and any
          registration  statement which may be filed pursuant hereto);  provided
          that, for purposes of the  representation  made in this sentence,  the
          Company is assuming  and  relying  upon the  accuracy of the  relevant
          representations and agreements of the Subscriber and/or its principals
          herein.

3.9       Exchange Act Reports.  The Company has delivered or made  available to
          --------------------
          the  Subscriber  true and complete  copies of the Exchange Act Reports

<PAGE>

                                                             Page 38 of 81 Pages

          (including,  without  limitation,  proxy  information and solicitation
          materials).  As of their  respective  dates,  the Exchange Act Reports
          complied  in  all  material  respects  with  the  requirements  of the
          Exchange  Act  and  rules  and  regulations  of  the  SEC  promulgated
          thereunder  and  other  federal,  state  and  local  laws,  rules  and
          regulations  applicable to such Exchange Act Reports,  and none of the
          Exchange Art Reports contained any untrue statement of a material fact
          or omitted to state a material fact  required to be stated  therein or
          necessary  in order to make the  statements  therein,  in light of the
          circumstances  under  which  they  were  made,  not  misleading.   The
          financial  statements  of the  Company  included in the  Exchange  Act
          Reports  comply as to form in all material  respects  with  applicable
          accounting requirements and the published rules and regulations of the
          SEC or other  applicable  rules and regulations  with respect thereto.
          Such  financial  statements  have been  prepared  in  accordance  with
          generally accepted accounting principles applied on a consistent basis
          during the periods involved (except (i) as may be otherwise  indicated
          in such financial  statements or the notes thereto or (ii) in the case
          of unaudited  interim  statements,  to the extent they may not include
          footnotes  or may be  condensed  or  summary  statements)  and  fairly
          present in all material respects the financial position of the Company
          as of the dates thereof and the results of  operations  and cash flows
          for  the  periods  then  ended  (subject,  in the  case  of  unaudited
          statements, to normal year-end audit adjustments).

3.10      No Material  Adverse Change.  Since September 30, 1996, the end of the
          ---------------------------
          period for which the most  recent  Quarterly  Report of the Company on
          Form 10-Q was filed with the SEC, a copy of which is  included  in the
          Exchange  Act  Reports,  no Material  Adverse  Effect has  occurred or
          exists with respect to the Company or its subsidiaries.

3.11      No Undisclosed  Liabilities.  The Company and its subsidiaries have no
          ---------------------------
          liabilities or obligations  not disclosed in the Exchange Act Reports,
          other than those  incurred in the ordinary  course of the Company's or
          its subsidiaries'  respective  businesses since September 30, 1996 and
          which,  individually  or in the aggregate,  do not or would not have a
          Material Adverse Effect on the Company and its subsidiaries taken as a
          whole.

3.12      No  Integrated   Offering.   Neither  the  Company,  nor  any  of  its
          ------------------------- 
          affiliates, nor any person acting on its or their behalf has, directly
          or  indirectly,  made any offers or sales of any security or solicited
          any offers to buy any security, under circumstances that would require
          registration of the Securities under the Securities Act.


<PAGE>


                                                             Page 39 of 81 Pages


3.13      Broker.  The Company has taken no action  which would give rise to any
          ------  
          claim by any person for brokerage commission, finder's fees or similar
          payments  by  the  Subscriber   relating  to  this  Agreement  or  the
          transactions contemplated hereby.

3.14      Acknowledgment  of Dilution.  The number of shares of Underlying Stock
          ---------------------------
          issuable upon conversion of the Series P Preferred Stock will increase
          substantially  in certain  circumstances,  including the  circumstance
          wherein the trading  price of the Common Stock  declines.  The Company
          acknowledges  that its  obligation  to  issue  Underlying  Stock  upon
          conversion of the Preferred  Stock in accordance  with the Certificate
          of  Designation  is  absolute  and  unconditional,  regardless  of the
          dilution  that such  issuance may have on the  ownership  interests of
          other  stockholders,  but is  nevertheless  subject  to the  terms and
          conditions  of  general   application  imposed  upon  the  Company  by
          governmental decrees and by the Exchange.

4.        Covenants of the Company

4.1       Registration  Rights. The Company shall, at the Closing,  enter into a
          --------------------     
          Registration Rights Agreement with the Subscriber in substantially the
          form annexed hereto as Exhibit B.
                                 --------- 

4.2       Reservation  of Common  Stock.  The Company has reserved  four million
          -----------------------------
          (4,000,000)  shares of Common Stock and the Company shall  continue to
          reserve and keep available at all times, free of preemptive rights and
          subject  to such  legal  limits  and rules of  exchanges  on which the
          Common Stock may be traded,  shares of Common Stock for the purpose of
          enabling the Company to satisfy any  obligation to issue shares of its
          Common  Stock  upon  conversion  of the Series P  Preferred  Stock and
          exercise of the outstanding Warrants; provided, however, that from and
                                                --------  -------
          after  the  date of the  Company's  annual  shareholders'  meeting  in
          calendar year 1997,  the number of shares so reserved shall at no time
          be less two  hundred  percent  (200%) of that  number of shares of the
          Company's Common Stock for which Preferred Stock and Warrants are then
          convertible  or  exercisable,  as equitably  adjusted  pursuant to any
          stock splits, split ups,  recapitalization or reorganization of shares
          of Common  Stock.  The number of shares so reserved  may be reduced by
          the number of shares  actually  delivered  pursuant to  conversion  of
          Series P Preferred  Stock;  provided that in no event shall the number
                                      --------
          of shares so  reserved  be less than the  maximum  number  required to
          satisfy  remaining  conversion  rights  on the  unconverted  Series  P
          Preferred Stock.

4.3       Listing of  Underlying  Stock.  The Company  hereby  agrees,  promptly
          -----------------------------    
          following  the  Closing  of  the  transaction   contemplated  by  this

<PAGE>

                                                             Page 40 of 81 Pages

          Agreement,  to take such  action to cause the  Underlying  Stock to be
          listed on the  Exchange  as  promptly  as  possible  but no later than
          ninety (90) days  following the Closing.  The Company  further  agrees
          that,  if the Company  applies to have the Common  Stock traded on any
          principal  stock  exchange,  it will include in such  application  the
          Underlying  Stock and will take such other  action as is  necessary or
          desirable to cause the Underlying  Stock to be listed on such exchange
          as promptly as possible.

4.4       Exchange Act Registration.  For so long as the Company is in existence
          ------------------------- 
          and Preferred  Stock remains  outstanding,  the Company will cause its
          Common Stock to continue to be registered under Section 12(g) or 12(b)
          of the Exchange  Act,  will comply in all respects  with its reporting
          and filing  obligations under said Act and will not take any action or
          file any document  (whether or not  permitted by said Act or the rules
          thereunder) to terminate or suspend such  registration or to terminate
          or suspend its  reporting and filing  obligations  under said Act. The
          Company  will take all action  necessary  to continue  the listing and
          trading of its Common  Stock on the  Exchange  and will  comply in all
          respects with the Company's  reporting,  filing and other  obligations
          under the by-laws or rules of the Exchange;  provided,  however,  that
          the  Company  may  terminate  such  listing at any time so long as the
          Company's  Common  Stock is then listed on either the  American  Stock
          Exchange or the New York Stock Exchange.

4.5       Corporate  Existence.  The Company  will take all steps  necessary  to
          --------------------
          preserve  and  continue  the  corporate   existence  of  the  Company;
          provided,  however,  that this sentence  shall not limit the Company's
          ability  to  engage  in  any  bona  fide   corporate   transaction  or
          reorganization otherwise consistent with this Agreement.

5.        [Intentionally Omitted]

6.        Governing Law

          This Agreement  shall be governed by and construed in accordance  with
          the laws of the  State of New York  without  regard to  principles  of
          conflicts of law or choice of law,  except for matters  arising  under
          the  Securities  Act or the  Exchange  Act,  which  matters  shall  be
          construed and  interpreted  in accordance  with such Acts. The Company
          hereby  agrees that all  actions or  proceedings  arising  directly or
          indirectly  from or in connection  with this Agreement  shall,  at the
          Subscriber's  sole option,  be litigated  only in the Supreme Court of
          the  State of New York or the  United  States  District  Court for the
          Southern  District of New York located in New York  County,  New York.

<PAGE>


                                                             Page 41 of 81 Pages

          The Company  consents to the  jurisdiction  and venue of the foregoing
          courts  and  consents  that any  process  or notice of motion or other
          application  to either of said courts or a judge thereof may be served
          inside or outside  the State of New York or the  Southern  District of
          New York by registered mail, return receipt requested, directed to the
          Company at its address  set forth in this  Agreement  (and  service so
          made  shall be deemed  complete  five (5) days after the same has been
          posted as aforesaid) or by personal service or in such other manner as
          may be permissible under the rules of said court.

7.        Assignment; Entire Agreement; Amendment

     (a)       Neither  this  Agreement  nor  any  obligations  of  the  Company
               hereunder  may be assigned by the Company to any other  person or
               entity.  The  provisions  of this  Agreement  shall  inure to the
               benefit of, and be  enforceable  by, any transferee of any of the
               Securities with respect to the Securities held by such person.

     (b)       This Agreement, the Warrants, the Certificate of Designation, the
               Registration  Rights Agreement and the other documents  delivered
               pursuant hereto constitute the full and entire  understanding and
               agreement  between the parties with regard to the subjects hereof
               and thereof,  and  supersedes  all prior  agreements  (including,
               without limitation,  that certain letter agreement dated December
               31, 1996 between the Company and S-C Rig  Investments-III,  L.P.,
               Winston   Partners   II  LLC  and   Winston   Partners  II  LDC),
               understandings  and negotiations,  both written and oral, between
               the parties with respect to the subject matter of this Agreement.
               No party  shall be  liable  or  bound to any  other  party in any
               manner by any warranties,  representations or covenants except as
               specifically  set forth in this  Agreement or therein.  Except as
               expressly provided in this Agreement,  neither this Agreement nor
               any term hereof may be amended, waived,  discharged or terminated
               other than by a written  instrument  signed by the party  against
               whom  enforcement  of any such  amendment,  waiver,  discharge or
               termination is sought.

8.        Publicity

          The Company agrees that it will not disclose,  and will not include in
          any  public  announcement,  the  name of the  Subscriber  without  its
          consent,  unless  and until  such  disclosure  is  required  by law or
          applicable   regulation,   and  then  only  to  the   extent  of  such
          requirement.

<PAGE>


                                                             Page 42 of 81 Pages


9.      Notices, Etc.; Expenses; Indemnity

(a)            Any notice,  demand or request  required or permitted to be given
               by either the Company or the Subscriber  pursuant to the terms of
               this Agreement shall be in writing and shall be deemed given when
               delivered personally or by facsimile,  with a hard copy to follow
               by two day courier  addressed to the parties at the  addresses of
               the parties set forth at the end of this  Agreement or such other
               address as a party may request by notifying the other in writing.
               Copies  of all  notices  to the  Subscriber  shall be sent to its
               designee or representative.

(b)            Each party shall  indemnify the other  against any loss,  cost or
               damages  (including  reasonable  attorney's  fees)  incurred as a
               result of such parties' breach of any  representation,  warranty,
               covenant or agreement in this Agreement.

10.       Counterparts

          This Agreement may be executed in any number of  counterparts  each of
          which shall be enforceable against the parties actually executing such
          counterparts,   and  all  of  which  together  shall   constitute  one
          instrument.

11.       Survival; Severability; Specific Performance

          The  representations,  warranties,  covenants  and  agreements  of the
          parties  hereto  shall  survive  the  Closing for a period of four (4)
          years  (except for the  covenants  contained in Sections 4.2, 4.3, 4.4
          and 4.5 which  shall  survive  indefinitely).  In the  event  that any
          provision  of this  Agreement  becomes  or is  declared  by a court of
          competent  jurisdiction  to be illegal,  unenforceable  or void,  this
          Agreement  shall  continue  in full  force  and  effect  without  said
          provision.  Notwithstanding  anything in this Agreement, the Warrants,
          the Registration Rights Agreement or the Certificate of Designation to
          the contrary, nothing shall limit the Subscriber's right to pursue any
          and all available  remedies,  whether at law or at equity  (including,
          without limitation, specific performance), in connection therewith.

  12.     Title and Subtitles

          The  titles  and  subtitles  used  in  this  Agreement  are  used  for
          convenience  only  and  are  not to be  considered  in  construing  or
          interpreting this Agreement.

<PAGE>

                                                             Page 43 of 81 Pages



13.       Amount; Delivery

          The undersigned  hereby subscribes for ___________ shares of Preferred
          Stock and  Warrants to purchase  _________shares  of Common Stock pays
          herewith funds in the amount of ______________________.

          The Company hereby  delivers to the  undersigned  the Preferred  Stock
          purchased by the  Subscriber,  together  with such  Warrants,  if any,
          which the  undersigned  is  acquiring  upon  initial  issuance  of the
          Preferred Stock.


<PAGE>


                                                             Page 44 of 81 Pages


                                   Name of Subscriber:



                                   By:  
                                        ---------------------------------------
                                        Name:
                                        Title:


                                   Date of Subscription: January 23, 1997
                                                         ----------------   

                                   Place of Execution: New York, New York
                                                       ------------------

                                   Place of Organization or Citizenship:

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

                                   Place of Residency  and/or Principal 
                                   Place of Business:

                                   (Telephone):
                                                -------------------------------
                                   (Fax):
                                          -------------------------------------
                                   Registration Instructions:
                                                              -----------------
                                   (Name)(Please Print):
                                                         ----------------------
                                                            
                                                         
<PAGE>


                                                             Page 45 of 81 Pages


THIS SUBSCRIPTION IS ACCEPTED BY THE COMPANY ON THE 23rd DAY OF JANUARY, 1997.


                                   GEOTEK COMMUNICATIONS, INC.




                                   By:
                                        ---------------------------------------
                                   --------------------------------------------
                                   Name:
                                   Title:



                                                             Page 46 of 81 Pages


                                    EXHIBIT R



NEITHER THESE  SECURITIES NOR THE SECURITIES  ISSUABLE UPON EXERCISE HEREOF HAVE
BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933 OR ANY STATE  SECURITIES LAWS.
THEY  MAY NOT BE SOLD OR  OFFERED  FOR  SALE  EXCEPT  PURSUANT  TO AN  EFFECTIVE
REGISTRATION  STATEMENT UNDER SAID ACT AND ANY APPLICABLE  STATE SECURITIES LAWS
OR AN APPLICABLE EXEMPTION FROM SUCH REGISTRATION REQUIREMENTS.


                                            Right to Purchase ________ Shares of
                                                          Common Stock of
                                                 Geotek Communications, Inc.


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

                          Common Stock Purchase Warrant

          Geotek Communications,  Inc., a Delaware corporation having an address
at 20 Craig Road, Montvale,  New Jersey 07645 (the "Company"),  hereby certifies
                                                    -------
that for good and valuable  consideration,  the receipt and sufficiency of which
are  hereby  acknowledged,  _____________________________,  having an address at
__________________________________  ("Purchaser") or any other Warrant Holder is
                                      ---------
entitled,  on the terms and  conditions  set forth below,  to purchase  from the
Company at any time after the date  hereof and ending  forty-eight  (48)  months
after the date hereof,  ____________________________  (_______)  shares of fully
paid and  nonassessable  shares of Common Stock,  $.01 par value, of the Company
(the "Common Stock"), at the Purchase Price (hereinafter  defined),  as the same
      ------------
may be adjusted pursuant to Section 5 herein.

1.        Definitions.
          -----------

          (a) the term "Warrant" shall mean this Common Stock Purchase Warrant.
                        -------

          (b) the term "Warrant Holder" shall mean the Purchaser or any assignee
                        --------------
of all or any  portion of this  Warrant  at any given  time who,  at the time of

<PAGE>


                                                             Page 47 of 81 Pages


assignment,  acquired the right to purchase at least 20,000 Warrant Shares (such
number being subject to adjustment  after the date hereof  pursuant to Section 5
herein.)

          (c) the term "Warrant Shares" shall mean the shares of Common Stock or
                        -------------- 
other securities issuable upon exercise of this Warrant.

          (d) the term  "Purchase  Price" shall mean ____ United States  Dollars
                         ---------------
and ________  Cents  ($_____) per share of Common  Stock,  as adjusted  upon any
stock split, split up,  recapitalization or other reorganization with respect to
the Common Stock.

          (e) the term "Act" shall mean the Securities Act of 1933, as amended.
                        ---

          (f) the term "Exchange Act" shall mean the Securities and Exchange Act
                        ------------
of 1934, as amended.

          (g) the term  "SEC" or  "Commission"  shall  mean the  Securities  and
                         ---       ----------
Exchange Commission or any successor agency.

          (h) the term "Rule 144" shall mean Rule 144 promulgated under the Act,
                        --------
as amended, and any successor rules promulgated under the Act.

          (i)  other  terms  used  herein  which  are  defined  in that  certain
Convertible  Securities  Subscription  Agreement,  dated  January  23, 1997 (the
"Subscription Agreement"), between the Company and the initial purchasers of the
 ----------------------
Company's  Series P  Convertible  Preferred  Stock shall have the same  meanings
herein as therein.

2.        Exercise of Warrant.
          -------------------

          This Warrant may be exercised  by the Warrant  Holder,  in whole or in
part, at any time and from time to time by surrender of this  Warrant,  together
with the form of exercise at the end hereof duly executed by the Warrant Holder,
and delivery of the Purchase  Price for such Warrant  Shares to the Company,  at
the Company's  principal  office. In the event that the Warrant is not exercised
in full,  the  number of Warrant  Shares  shall be reduced by the number of such
Warrant  Shares for which this Warrant is  exercised,  and the  Company,  at its
expense,  shall  forthwith issue and deliver to or upon the order of the Warrant
Holder a new Warrant of like tenor in the name of the  Warrant  Holder or as the
Warrant Holder (upon payment by the Warrant  Holder of any  applicable  transfer
taxes) may request, reflecting such adjusted Warrant Shares.

<PAGE>

                                                             Page 48 of 81 Pages


        3.     Delivery of Stock Certificates.
               ------------------------------ 

               (a) Subject to the terms and conditions of this Warrant,  as soon
as practicable after the exercise of this Warrant in full or in part, and in any
event  within two (2)  business  days  thereafter,  the  Company at its  expense
(including, without limitation, the payment by it of any applicable issue taxes)
will cause to be issued in the name of and delivered to the Warrant  Holder,  or
as the Warrant  Holder  (upon  payment by the Warrant  Holder of any  applicable
transfer  taxes) may lawfully  direct,  a certificate  or  certificates  for the
number of fully  paid and  non-assessable  shares  of Common  Stock to which the
Warrant Holder shall be entitled on such exercise, together with any other stock
or other securities or property  (including cash, where applicable) to which the
Warrant Holder is entitled upon such exercise.

               (b) This Warrant may not be exercised as to fractional  shares of
Common  Stock.  In the event that the  exercise of this  Warrant,  in full or in
part, would result in the issuance of any fractional share of Common Stock, then
the number of Warrant  Shares for which this Warrant  shall have been  exercised
shall be rounded up or down to the nearest whole number of Warrant Shares.

               (c) Upon the  exercise of this  Warrant in full,  or its exchange
pursuant to clause (ii) of paragraph (d) of Section 5 below,  or the issuance of
any replacement Warrant pursuant to Section 9 hereof, this Warrant and rights of
the Warrant Holder  relating to its exercise and the right of the Warrant Holder
to receive any additional  shares of the Company's  Common Stock under the terms
of this Warrant shall terminate.

               (d)  Notwithstanding  anything in this Section 3 to the contrary,
in the event a Warrant  Holder  instructs  the Company in writing at the time of
exercise of this Warrant Holder not to issue all or any portion of the shares of
Common  Stock to which  such  holder is  entitled  upon  exercise  hereof or the
Company determines that it is prohibited from issuing all or any portion of such
shares  of  Common  Stock,  in any such  case,  due to the  requirements  of the
Hart-Scott-Rodino  Antitrust  Improvements  Act of 1976,  as  amended  (the "HSR
Act"), the Company shall promptly deliver certificates representing such portion
of the shares of Common Stock that may be issued without compliance with the HSR
Act and shall  refrain  from  issuing  any  additional  shares  of Common  Stock

<PAGE>


                                                             Page 49 of 81 Pages

issuable to such Warrant Holder with respect to such exercise until permitted to
do so under  the HSR Act.  In the  event  any  portion  of this  Warrant  is not
exercised  as a result of this  paragraph,  the date of exercise of this Warrant
shall remain  unchanged  and the Warrant  Holder shall be treated as a holder of
the Common Stock  issuable  upon such  exercise as of such exercise date for all
purposes  (including,  without limitation,  for purposes of participating in any
stock  splits,  distributions,  reorganizations  or  reclassifications  having a
record date for determining Common Stockholders  entitled to participate therein
as of or after such  exercise  date);  provided,  however,  that no such Warrant
Holder  shall be entitled to vote any shares of Common  Stock that have not been
so issued  prior to the date of the  meeting or the consent at which the vote of
holders of Common Stock is counted and provided,  further, that no distributions
so payable  with  respect to any such shares of Common Stock shall be paid until
the issuance of the Common Stock to which such distribution relates.


        4.     Covenants Of the Company.
               ------------------------ 

               (a) The Company shall use its  reasonable  best efforts to insure
that a Registration Statement under the Act covering the issuance of the Warrant
Shares and the resale or other  disposition  thereof  by the  Warrant  Holder is
effective as provided in the Registration Rights Agreement.

               (b) The Company shall take all necessary  action and  proceedings
as may be  required  and  permitted  by  applicable  law,  rule and  regulation,
including,  without  limitation the notification of the National  Association of
Securities  Dealers,  Inc., for the legal and valid issuance of this Warrant and
the Warrant Shares to the Warrant Holder under this Warrant.

               (c) From the date  hereof  through  the last  date on which  this
Warrant is exercisable,  the Company shall take all steps  reasonably  necessary
and within its control to insure that the Common Stock remains  listed on either
the Nasdaq  National  Stock Market,  the American Stock Exchange or the New York
Stock  Exchange   (collectively,   the  "Exchange")  and  shall  not  amend  its
                                         --------
Certificate  of  Incorporation  or  By-laws  so as to  adversely  affect  in any
material way any rights of the Warrant Holder under this Warrant.

               (d) The Company  shall at all times  reserve and keep  available,
solely for  issuance and delivery as Warrant  Shares  hereunder,  such shares of
Common Stock as shall from time to time be issuable as Warrant Shares.

               (e) The Warrant Shares,  when issued in accordance with the terms
hereof,  will be duly  authorized  and, when issued in accordance with the terms
hereof, shall be validly issued, fully paid,  non-assessable,  free and clear of
any liens created by the Company and shall be, as long as the Warrant Shares are
subject to an effective registration statement or the applicable SEC Rule 144(k)

<PAGE>


                                                             Page 50 of 81 Pages

waiting period has expired,  free of any  restrictive  legends.  The Company has
authorized and reserved for issuance to the Warrant Holder the requisite  number
of shares of Common Stock to be issued pursuant to this Warrant.

               (f) With a view to making  available  to the  Warrant  Holder the
benefits of Rule 144 promulgated  under the Act and any other rule or regulation
of the SEC that may at any time permit the Warrant Holder to sell  securities of
the Company to the public  without  registration,  the Company agrees to use its
reasonable best efforts to:

               (i) make and keep public  information  available,  as those terms
          are understood and defined in Rule 144, at all times;

               (ii) file with the SEC in a timely  manner all  reports and other
          documents  required of the Company under the Act and the Exchange Act;
          and

               (iii)  furnish to any Warrant  Holder  forthwith  upon  request a
          written  statement  by the  Company  that  it has  complied  with  the
          reporting  requirements  of Rule  144 and of the Act and the  Exchange
          Act,  a copy of the most  recent  annual  or  quarterly  report of the
          Company,  and such other reports and documents so filed by the Company
          as may be  reasonably  requested to permit any such Warrant  Holder to
          take  advantage of any rule or  regulation of the SEC  permitting  the
          selling of any such securities without registration.

               (g) For purposes of complying with any  applicable  provisions of
the HSR Act, each Warrant  Holder and the Company (as the case may be) agrees to
provide promptly to the other, upon the other's written request,  all reasonable
requested information regarding itself and its affiliates which is necessary for
the requesting  party to file any  notifications  or other  information with the
United States Justice Department or Federal Trade Commission pursuant to the HSR
Act. In the event a Warrant Holder is required to file a premerger  notification
under the HSR Act with  respect to the  exercise  of this  Warrant,  the Warrant
Holder and the Company shall promptly prepare and make all such required filings
and shall request early termination of the waiting period with respect thereto.

          5.  Adjustment of Exercise  Price and Number of Shares.  The number of
              --------------------------------------------------  
and  kind of  securities  purchasable  upon  exercise  of this  Warrant  and the
Purchase Price shall be subject to adjustment from time to time as follows:


<PAGE>


                                                             Page 51 of 81 Pages


               (a)  Subdivisions,  Combinations  and  Other  Issuances.  If  the
                    --------------------------------------------------
Company  shall at any time after the date hereof but prior to the  expiration of
this Warrant  subdivide its  outstanding  securities as to which purchase rights
under this Warrant exist,  by split-up or otherwise,  or combine its outstanding
securities as to which purchase  rights under this Warrant exist,  the number of
Warrant  Shares as to which this Warrant is  exercisable  as of the date of such
subdivision,   split-up  or  combination  shall  forthwith  be   proportionately
increased in the case of a subdivision, or proportionately decreased in the case
of a  combination.  Appropriate  adjustments  shall also be made to the purchase
price payable per share, but the aggregate  purchase price payable for the total
number of Warrant  Shares  purchasable  under this Warrant as of such date shall
remain the same.

          (b) Stock  Dividend.  If at any time after the date hereof the Company
              ---------------
declares a dividend  or other  distribution  on Common  Stock  payable in Common
Stock  or  other  securities  or  rights  convertible  into or  exchangeable  or
exercisable for Common Stock ("Common Stock Equivalents") without payment of any
                               ------------------------
consideration  by holders of Common  Stock for the  additional  shares of Common
Stock or the Common Stock Equivalents (including the additional shares of Common
Stock issuable upon exercise or conversion  thereof),  then the number of shares
of Common Stock for which this Warrant may be exercised shall be increased as of
the record date (or the date of such dividend  distribution if no record date is
set) for determining  which holders of Common Stock shall be entitled to receive
such  dividends,  in  proportion  to the  increase in the number of  outstanding
shares  (and  shares  of  Common  Stock  issuable  upon  conversion  of all such
securities  convertible  into Common  Stock) of Common Stock as a result of such
dividend,  and the Purchase Price shall be adjusted so that the aggregate amount
payable  for  the  purchase  of  all  the  Warrant  Shares  issuable   hereunder
immediately  after  the  record  date (or on the date of such  distribution,  if
applicable)  for such  dividend  shall  equal the  aggregate  amount so  payable
immediately  before such record  date (or on the date of such  distribution,  if
applicable).

          (c) Other  Distributions.  If at any time  after the date  hereof  the
              --------------------
Company  distributes  to holders of its Common Stock,  other than as part of its
dissolution,  liquidation  or the winding up of its  affairs,  any shares of its
capital  stock,  any evidence of  indebtedness  or any of its assets (other than
cash,  Common Stock or securities  convertible into Common Stock),  then the per
share  Purchase  Price of this Warrant  shall be adjusted so that the same shall
equal  the  price  determined  by  multiplying  the  Purchase  Price  in  effect
immediately prior to the date of such distribution by a fraction whose numerator
shall be the  closing  price per share of Common  Stock on the  Exchange  on the
effective date of distribution less the then fair market value (as determined by
the Company's  Board of Directors and the Holder or, if they cannot agree,  by a

<PAGE>

                                                             Page 52 of 81 Pages

mutually  acceptable third party at the Company's expense) of the capital stock,
or evidences of indebtedness or other assets so distributed with respect to each
share of Common  Stock and whose  denominator  shall be such  closing  price per
share of the Common  Stock.  Such  adjustment  shall be made  whenever  any such
distribution  is made and shall be  retroactively  effective  as of  immediately
after the record date for the determination of stockholders  entitled to receive
such distribution.

          (d) Merger, etc. If at any time after the date hereof there shall be a
              -----------
merger or  consolidation  of the  Company  with or into or a transfer  of all or
substantially  all of the assets of the Company to another  entity,  then before
such  transaction  may be consummated and become  effective,  the Warrant Holder
shall have  received  (1) prior  notice  thereof at such time as notice  thereof
shall be publicly  released or  furnished to its  stockholders  generally by the
Company,  whichever  is earlier,  and (2) such  information  with  respect  such
transaction as is furnished by the Company, or otherwise made available,  to its
stockholders generally,  all at the time such information is so furnished to the
Company's stockholders and, in any event, sufficiently prior to such transaction
becoming  effective  in order to give the  Holder a  reasonable  opportunity  to
decide upon and make the election hereinafter  provided,  and the Warrant Holder
shall be  entitled  to  receive  upon such  transfer,  merger  or  consolidation
becoming effective, at the election of the Warrant Holder made prior to the same
becoming  effective,  either  (i) upon  payment  of the  Purchase  Price then in
effect,  the number of shares or other  securities or property of the Company or
of the successor corporation resulting from such merger or consolidation,  which
would have been  received by Warrant  Holder for the shares of stock  subject to
this Warrant had this Warrant been exercised just prior to such transfer, merger
or consolidation becoming effective or to the applicable record date thereof, as
the case may be, or (ii) a warrant to acquire  common stock or other  securities
of such other  entity at an  exercise  price and upon such  other  terms as will
provide  the  Warrant  Holder  with  economic  and  other  benefits  and  rights
substantially equivalent to those provided herein.

          (e) Reclassification,  etc. If at any time after the date hereof there
              ----------------------
shall be a  reorganization  or  reclassification  of the  securities as to which
purchase rights under this Warrant exist into the same or a different  number of
securities  of any  other  class or  classes,  then  the  Warrant  Holder  shall
thereafter  be entitled to receive  upon  exercise of this  Warrant,  during the
period  specified  herein and upon payment of the Purchase Price then in effect,
the  number  of shares  or other  securities  or  property  resulting  from such
reorganization  or  reclassification,  which  would  have been  received  by the
Warrant  Holder for the shares of stock subject to this Warrant had this Warrant
at such time been exercised.

<PAGE>


                                                             Page 53 of 81 Pages

          (f) Purchase  Price  Adjustment.  In the event that the Company at any
              ---------------------------
time after the date hereof issues or sells any Common Stock or securities  which
are convertible  into or  exchangeable  for its Common Stock, or any warrants or
other  rights to subscribe  for or to purchase,  or any options for the purchase
of, its Common Stock or any such convertible or exchangeable  securities  (other
than in connection with a public offering,  the Preferred Stock, the warrants to
be issued by the Company in  conjunction  with the  Preferred  Stock,  shares or
options  issued or which may be issued  pursuant  to the  Company's  employee or
director  option plans or shares  issued upon  exercise of options,  warrants or
rights, or upon exercise,  conversion or exchange of securities convertible into
or exercisable or exchangeable for other securities of the Company,  whether now
or  hereafter  outstanding,  or  pursuant  to the terms of the  Preferred  Stock
outstanding on the date of the Subscription Agreement and listed in the Exchange
Act  Reports) at an  effective  purchase  price per share which is less than the
Purchase Price then in effect or the fair market value,  whichever is lower,  of
the Common Stock on the trading day next preceding  such issue or sale,  then in
each such case, the Purchase Price in effect  immediately prior to such issue or
sale  shall be  reduced  effective  concurrently  with such  issue or sale to an
amount  determined  by  multiplying  the  Purchase  Price  then in  effect  by a
fraction,  (x) the  numerator  of which  shall be the sum of (1) the  number  of
shares of Common Stock outstanding immediately prior to such issue or sale, plus
                                                                            ----
(2) the  number  of shares of Common  Stock  which the  aggregate  consideration
received by the Company for such  additional  securities  would purchase at such
fair market value or Purchase  Price,  as the case may be, then in effect,  plus
                                                                            ----
(3) the number of shares of Common Stock issuable upon  exercise,  conversion or
exchange of all of the Company's then outstanding  convertible  securities which
are, as of the time of the new issuance,  convertible or  exchangeable  into the
Company's Common Stock; and (y) the denominator of which shall be the sum of (1)
the  number of shares of Common  Stock of the  Company  outstanding  immediately
after such issue or sale plus (2) the number of shares of Common Stock  issuable
                         ----
upon exercise,  conversion or exchange of all of the Company's then  outstanding
convertible  securities  which  are,  as  of  the  time  of  the  new  issuance,
convertible or exchangeable into the Company's Common Stock.

          In the event of any such  issuance for a  consideration  which is less
than such fair  market  value and also  less  than the  Purchase  Price  then in
effect, then there shall be only one such adjustment by reason of such issuance,
such  adjustment  to be that which  results  in the  greatest  reduction  of the
Purchase Price computed as aforesaid. For the purposes of this Section 5(f), the
"aggregate  consideration received by the company" is equal to the total amount,
if any,  received or receivable by the Company as consideration for the issuance
or sale of all such securities,  plus the minimum aggregate amount of additional

<PAGE>


                                                             Page 54 of 81 Pages

consideration,  if any, payable to the Company upon the exercise,  conversion or
exchange  thereof  at  the  time  such  securities  first  become   exercisable,
convertible or exchangeable.

          6.  No  Impairment.   The  Company  will  not,  by  amendment  of  its
              -------------- 
Certificate of Incorporation or through any reorganization,  transfer of assets,
consolidation,  merger,  dissolution,  issue or sale of  securities or any other
voluntary action, avoid or seek to avoid the observance or performance of any of
the terms of this  Warrant,  but will at all times in good  faith  assist in the
carrying  out of all such terms and in the  taking of all such  action as may be
necessary or  appropriate  in order to protect the rights of the Warrant  Holder
against  impairment.  Without  limiting the  generality  of the  foregoing,  the
Company  (a) will not  increase  the par value of any Warrant  Shares  above the
amount payable  therefor on such exercise,  and (b) will take all such action as
may be reasonably necessary or appropriate in order that the Company may validly
and legally issue fully paid and nonassessable Warrant Shares on the exercise of
this Warrant.

          7. Notice of  Adjustments;  Notices.  Whenever the  Purchase  Price or
             --------------------------------
number of Shares  purchasable  hereunder shall be adjusted pursuant to Section 5
hereof,  the  Company  shall  execute  and  deliver  to  the  Warrant  Holder  a
certificate  setting  forth,  in  reasonable  detail,  the event  requiring  the
adjustment,  the amount of the  adjustment,  the method by which such adjustment
was calculated and the Purchase Price and number of shares purchasable hereunder
after  giving  effect  to  such  adjustment,  and  shall  cause  a copy  of such
certificate to be mailed (by first class mail,  postage  prepaid) to the Warrant
Holder.

          8.  Rights As  Stockholder.  Prior to exercise  of this  Warrant,  the
              ----------------------
Warrant  Holder  shall not be  entitled  to any rights as a  stockholder  of the
Company with respect to the Warrant Shares,  including (without  limitation) the
right to vote such shares,  receive dividends or other distributions  thereon or
be notified of stockholder meetings.  However, in the event of any taking by the
Company of a record of the holders of any class of securities for the purpose of
determining  the holders thereof who are entitled to receive any dividend (other
than a cash  dividend)  or  other  distribution,  any  right to  subscribe  for,
purchase  or  otherwise  acquire  any  shares of stock of any class or any other
securities  or  property,  or to receive any other right  (other than a right to
vote),  the Company  shall mail to each Warrant  Holder,  at least ten (10) days
prior to the date specified  therein,  a notice specifying the date on which any
such record is to be taken for the  purpose of such  dividend,  distribution  or
right, and the amount and character of such dividend, distribution or right.

<PAGE>

                                                             Page 55 of 81 Pages


          9.  Replacement  of  Warrant.   On  receipt  of  evidence   reasonably
              ------------------------
satisfactory to the Company of the loss, theft, destruction or mutilation of the
Warrant and, in the case of any such loss,  theft or destruction of the Warrant,
on delivery of an indemnity  agreement or security  reasonably  satisfactory  in
form and  amount  to the  Company  or,  in the case of any such  mutilation,  on
surrender and cancellation of such Warrant, the Company, upon receipt by it of a
form of Warrant  reflecting  the terms of the new  Warrant,  at its expense will
execute and deliver, in lieu thereof, a new Warrant of like tenor.

          10. Specific Enforcement; Consent to Jurisdiction.
              --------------------------------------------- 

               (a) The Company and the Warrant Holder acknowledge and agree that
irreparable  damage would occur in the event that any of the  provisions of this
Warrant  were not  performed in  accordance  with their  specific  terms or were
otherwise breached.  It is accordingly agreed that the parties shall be entitled
to an injunction or injunctions to prevent or cure breaches of the provisions of
this Warrant and to enforce  specifically the terms and provisions hereof,  this
being in addition to any other remedy to which either of them may be entitled by
law or equity.

               (b)  Each  of the  Company  and the  Warrant  Holder  (i)  hereby
irrevocably submits to the jurisdiction of the Supreme Court of the State of New
York and the United States District Court for the Southern  District of New York
for the purposes of any suit, action or proceeding arising out of or relating to
this Warrant and (ii) hereby waives,  and agrees not to assert in any such suit,
action  or  proceeding,  any  claim  that it is not  personally  subject  to the
jurisdiction of such court, that the suit, action or proceeding is brought in an
inconvenient  forum or that the  venue of the  suit,  action  or  proceeding  is
improper.  Each of the Company and the Warrant Holder  consents to process being
served in any such suit,  action or proceeding by mailing a copy thereof to such
party at the address in effect for  notices to it under this  Warrant and agrees
that such service shall  constitute  good and sufficient  service of process and
notice  thereof.  Nothing in this  paragraph  shall affect or limit any right to
serve process in any other manner permitted by law.

          11.  Entire  Agreement;  Amendments.  This Warrant and the  provisions
               ------------------------------    
contained in the Subscription  Agreement,  the Registration  Rights Agreement or
the  Certificate  of  Designation  and  incorporated  into this  Warrant and the
Warrant Shares contain the entire  understanding  of the parties with respect to
the matters  covered hereby and thereby and,  except as  specifically  set forth
herein and  therein,  neither  the  Company  nor the  Warrant  Holder  makes any

<PAGE>


                                                             Page 56 of 81 Pages


representation,  warranty, covenant or undertaking with respect to such matters.
No provision  of this  Warrant may be waived or amended  other than by a written
instrument signed by the party against whom enforcement of any such amendment or
waiver is sought.

          12.  Restricted  Securities.  Sections  2.1,  2.2,  2.3 and 2.4 of the
               ----------------------
Subscription  Agreement are  incorporated  herein by reference and hereby made a
part hereof.

          13. Notices.  Any notice or other communication  required or permitted
              -------
to be given  hereunder  shall be in writing and shall be effective (a) upon hand
delivery or receipt by telex (with correct  answer back  received),  telecopy or
facsimile at the address or number  designated below (if delivered on a business
day during normal  business  hours where such notice is to be received),  or the
first  business  day  following  such  delivery  (if  delivered  other than on a
business day during normal  business hours where such notice is to be received),
or (b) on the  second  business  day  following  the date of  mailing by express
courier  service,  fully  prepaid,  addressed  to such  address,  or upon actual
receipt of such  mailing,  whichever  shall first occur.  The addresses for such
communications shall be:

               to the Company:

                              Geotek   Communications,   Inc.
                              20  Craig   Road
                              Montvale,  NJ  07645
                              Attn:  General  Counsel  and
                              Secretary Fax: (201) 930-9614

               with copies to:

                              Klehr, Harrison, Harvey, Branzburg & Ellers
                              1401 Walnut Street
                              Philadelphia, PA 19102
                              Attn: Leonard M. Klehr, Esq.
                              Fax: (215) 568-6603

               to the Warrant Holder:

<PAGE>


                                                             Page 57 of 81 Pages


                         ------------------------------------------------------
                         ------------------------------------------------------
                         ------------------------------------------------------
                         Fax:    (___) ___-____

               with copies to:


                         ------------------------------------------------------
                         ------------------------------------------------------
                         ------------------------------------------------------
                         Fax:    (___) ___-____


Either party  hereto may from time to time change its address for notices  under
this  Section 13 by giving at least ten (10) days prior  written  notice of such
changed address to the other party hereto.

          14.  Miscellaneous.  This  Warrant and any term hereof may be changed,
               -------------
waived,  discharged or terminated only by an instrument in writing signed by the
party against which enforcement of such change, waiver, discharge or termination
is sought.  This Warrant shall be construed and enforced in accordance  with and
governed by the laws of the State of New York.  The headings in this Warrant are
for purposes of reference  only, and shall not limit or otherwise  affect any of
the terms hereof.  The invalidity or  unenforceability  of any provision  hereof
shall in no way affect the validity or enforceability of any other provision.

          15.  Expiration.  The right to  exercise  this  Warrant  shall  expire
               ---------- 
forty-two (42) months after the date hereof; provided, however, that such period
                                             --------  -------
shall be increased by and for the number of days during which the Warrant Holder
is  precluded  from  exercising  this  Warrant  because of any  set-off  period,
black-out period,  failure of the Company to have filed or accurately maintained
effective registration of the Registration Statement or otherwise.

          16.  Transfer Restrictions.

                (a)  Neither  this  Warrant  nor the  securities  issuable  upon
exercise hereof may be transferred,  disposed of or encumbered (any such action,

<PAGE>


                                                             Page 58 of 81 Pages


a  "Transfer")  except in accordance  with and subject to the  provisions of the
Securities  Act,  any  applicable  state  securities  laws  and  the  rules  and
regulations promulgated thereunder. If at the time of a Transfer, a registration
statement  is not in effect to  register  this  Warrant or the  issuance  of the
Warrant Shares, this Warrant may only be transferred to an "Accredited Investor"
(as  defined in the  Securities  Act) and the  Company  may  require the Warrant
Holder  to make  such  customary  representations  and  deliver  such  customary
opinions  of  counsel,  and may place such  customary  legends  on  certificates
representing  this  Warrant,  as may be  reasonably  required  in the opinion of
counsel to the Company to permit a transfer without such registration.

                (b) This Warrant may not be sold or otherwise  transferred  to a
competitor of the Company  engaged in, or to the knowledge of the holder of this
Warrant,  planning to engage in the business of providing wireless voice or data
communications  services  to  mobile  customers  or of  providing  equipment  in
connection therewith.

<PAGE>


                                                             Page 59 of 81 Pages



Dated:  ______ __, ____                 GEOTEK COMMUNICATIONS, INC.


                                        By: ____________________________
                                        Name:
                                        Title:__________________________


[CORPORATE SEAL]

Attest:

By:_______________________
Its:

                                        NAME OF INVESTOR:

                                        -----------------------
                                        By its:


                                        By: ____________________________
                                        Name:
                                        Title:__________________________

<PAGE>


                                                             Page 60 of 81 Pages


                               FORM OF WARRANT EXERCISE
                      (To be signed only on exercise of Warrant)

TO _________________________

                The  undersigned,  the  holder  of the  within  Warrant,  hereby
irrevocably  elects to exercise  this Warrant  for, and to purchase  thereunder,
_________  shares of Common  Stock of Geotek  Communications,  Inc.,  a Delaware
corporation (the "Company"), and herewith makes payment of $__________ therefor,
and requests that the certificates for such shares be issued in the name of, and
delivered       to        _________________,        whose       address       is
__________________________________.

Dated:                                      __________________________________


                  (Signature must conform to name of holder as
                     specified on the face of the Warrant)


                                            ----------------------------------
                                                          (Address)

                                            Tax Identification Number:________


<PAGE>

                                                             Page 61 of 81 Pages


                               FORM OF ASSIGNMENT
                   (To be signed only on transfer of Warrant)

For value received,  the undersigned hereby sells,  assigns,  and transfers unto
_________________  the right  represented  by the  within  Warrant  to  purchase
_____________ shares of Common Stock of Geotek Communications,  Inc., a Delaware
corporation, to which the within Warrant relates, and appoints _________________
Attorney to  transfer  such right on the books of Geotek  Communications,  Inc.,
with full power of substitution in the premises.

Dated:
                                             ----------------------------------


                   (Signature must conform to name of holder
                    as specified on the face of the Warrant)


                                            ----------------------------------
                                                          (Address)

Signed in the presence of:

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


                                                             Page 62 of 81 Pages


                                    EXHIBIT S



                          REGISTRATION RIGHTS AGREEMENT


          THIS  REGISTRATION   RIGHTS  AGREEMENT  (this   "Registration   Rights
Agreement"),   entered   into  as  of  January   23,   1997,   between  S-C  Rig
Investments-III, L.P., Winston Partners II LLC, Winston Partners II LDC, Winston
Partners L.P. (collectively, the "Purchaser"), and Geotek Communications,  Inc.,
a Delaware corporation with its principal office at 20 Craig Road, Montvale, New
Jersey 07645 (the "Company").

                              W I T N E S S E T H:

          WHEREAS,  pursuant to a Convertible Securities Subscription Agreement,
dated as of January 23, 1997 (the  "Agreement"),  by and between the Company and
the  Purchaser,  the Company has agreed to sell and the  Purchaser has agreed to
purchase  U.S.$25,000,000 of the Company's Series P Convertible  Preferred Stock
at a price of $50,000 per share (the "Preferred Stock")  convertible into shares
of the Company's Common Stock, $.01 par value (the "Shares");

          WHEREAS,  pursuant to the Agreement,  the Company is issuing  warrants
for the  purchase of the Shares and  pursuant to the  Company's  Certificate  of
Designation  of  Series P  Convertible  Preferred  Stock  (the  "Certificate  of
Designation"),  the Company is required to issue to the holders of the Preferred
Stock certain  other  warrants for the purchase of the Shares upon the Company's
redemption of the Preferred Stock (collectively, the "Warrants");

          WHEREAS,  pursuant to the terms of and in partial  consideration  for,
the Purchaser's agreement to enter into the Agreement, the Company has agreed to
provide the  Purchaser  with  certain  registration  rights with  respect to the
Shares and other shares of Common Stock issuable upon  conversion or exercise of
securities of the Company  currently  held by the Purchaser  (collectively,  the
"Existing Securities") ;

          NOW,   THEREFORE,   in   consideration   of   the   mutual   promises,
representations,   warranties,   covenants  and  conditions  set  forth  in  the
Agreement,  Certificate of Designation and this  Registration  Rights Agreement,
the Company and the Purchaser agree as follows:

<PAGE>

                                                             Page 62 of 81 Pages


1.        Certain  Definitions.  As used in this Registration  Rights Agreement,
          --------------------
the following terms shall have the following respective meanings:

          "SEC" shall mean the Securities  and Exchange  Commission or any other
federal agency at the time administering the Securities Act.

          "Registrable Securities" shall mean: (i) Shares issued to Purchaser or
its designee upon  conversion,  exercise or exchange of the Preferred Stock, the
Warrants or any  Existing  Securities  or upon any stock split,  stock  dividend
(pursuant to the Certificate of Designation or otherwise),  recapitalization  or
similar  event with respect to such Shares;  (ii) any Shares issued to Purchaser
as dividends on the Preferred  Stock or any Existing  Securities;  and (iii) any
securities  issued or issuable to Purchaser or any Holder upon the conversion or
exercise or exchange of any Preferred Stock,  Warrants,  Existing  Securities or
Shares.

          The terms "register", "registered" and "registration" shall refer to a
registration  effected  by  preparing  and filing a  registration  statement  in
compliance  with  the  Securities  Act  and  applicable  rules  and  regulations
thereunder,  and  the  declaration  or  ordering  of the  effectiveness  of such
registration statement.

          "Registration  Expenses" shall mean all expenses to be incurred by the
Company in connection with Purchaser's exercise of its registration rights under
this  Registration  Rights  Agreement,   including,   without  limitation,   all
registration  and filing fees,  printing  expenses,  fees and  disbursements  of
counsel  for the  Company  and blue sky fees and  expenses  (but  excluding  the
compensation  of regular  employees of the  Company,  which shall be paid in any
event by the Company).

          "Selling  Expenses" shall mean all underwriting  discounts and selling
commissions,  if any,  applicable to the sale of Registrable  Securities and all
fees and disbursements of counsel for Holder.

          "Holder"  shall include the Purchaser and any  transferee of Preferred
Stock,  Warrants,  Existing Securities,  Shares or Registrable  Securities which
have not been sold to the public to whom the  registration  rights  conferred by
this  Registration  Rights  Agreement have been  transferred in compliance  with
Section 12 of this Registration Rights Agreement.

          "Registration  Statement"  shall have the meaning set forth in Section
2(a) herein.

<PAGE>

                                                             Page 64 of 81 Pages

          "Regulation D" shall mean Regulation D as promulgated  pursuant to the
Securities Act, and as subsequently amended.

          "Securities Act" shall mean the Securities Act of 1933, as amended.

2.        The  Registration  Requirements.  The Company  represents and warrants
          -------------------------------
that it is qualified and eligible to use the registration  statement on Form S-3
under the  Securities  Act.  The Company  shall file and use its best efforts to
cause to become effective,  as promptly as possible and in any event by the 90th
calendar day after the Closing Date, a registration  statement on Form S-3 under
the Securities Act or, if Form S-3 is not then  available,  another  appropriate
form  covering the resale of the Shares  issuable on conversion of the Preferred
Stock and upon  exercise of the Warrants and shall take all action  necessary to
qualify  the Shares  under state "blue sky" laws as  hereinafter  provided.  The
Company  shall  use  its  diligent  best  efforts  to  effect  the  registration
contemplated by the foregoing (including,  without limitation,  the execution of
an undertaking to file post-  effective  amendments,  appropriate  qualification
under  applicable  blue  sky or other  state  securities  laws  and  appropriate
compliance with applicable  regulations  issued under the Securities Act) and as
would permit or  facilitate  the sale and  distribution  of all the  Registrable
Securities  in all states  reasonably  requested  by the Holder for  purposes of
maximizing   the  proceeds   realizable   by  the  Holder  from  such  sale  and
distribution.   Such  best  efforts  by  the  Company  shall  include,   without
limitation, the following:

               (a) The Company shall file (i) a registration  statement with the
               SEC  pursuant  to Rule 415 under the  Securities  Act on Form S-3
               under  the  Securities  Act and the  Company  shall  use its best
               efforts to qualify for the use of such Form (or in the event that
               the Company is  ineligible  to use such form,  such other form as
               the Company is eligible to use under the Securities Act) covering
               the Registrable Securities (other than the Registrable Securities
               issuable upon conversion or exercise or otherwise with respect to
               the Existing  Securities)  to be  registered  (the  "Registration
               Statement");  (ii) such blue sky  filings as shall be  reasonably
               requested  to permit  such  sales;  provided,  however,  that the
                                                   --------   -------
               Company  shall  not  be  required  to  register  the  Registrable
               Securities in any  jurisdiction  that would subject it to general
               service of process in any such jurisdiction  where it is not then
               so  subject  or  subject  the  Company  to any  tax  in any  such
               jurisdiction  where it is not then so subject  or to require  the
               Company to qualify to do business in any jurisdiction where it is
               not then so  qualified;  and (iii) any required  filings with the
               Nasdaq  National  Market  ("Nasdaq")  and any exchange  where the
               Shares  are  traded,  all as soon as  practicable  after the date
               hereof.  The  Company  shall  use its best  efforts  to have such

<PAGE>


                                                             Page 65 of 81 Pages


               Registration  Statement and other filings  declared  effective as
               soon thereafter as may be practicable.

               (b) The  Company  shall  enter  into  such  customary  agreements
               (including   a   customary   underwriting   agreement   with  the
               underwriter  or  underwriters,  if any) and  take all such  other
               reasonable actions, in connection  therewith in order to expedite
               or facilitate the disposition of such Registrable  Securities and
               in such connection whether or not the Registrable  Securities are
               to be sold in an underwritten offering, the Company shall:

                         (i) make such  representations  and  warranties  to the
                    Holder and the underwriter or underwriters,  if any, in form
                    and substance and scope as are  customarily  made by issuers
                    to underwriters in secondary underwritten offerings;

                         (ii)  cause  to  be   delivered   to  the   sellers  of
                    Registrable  Securities and the underwriter or underwriters,
                    if any,  opinions of counsel to the Company,  dated the date
                    of  delivery of any  Registrable  Securities  sold  pursuant
                    thereto,  which  counsel and  opinions  (in form,  scope and
                    substance) shall be reasonably  satisfactory to the managing
                    underwriter or underwriters and the appointed representative
                    or counsel of the Holder,  addressed  to the Holder and each
                    underwriter:

                              (A)  in  the  case  of an  underwritten  offering,
                         covering  the matters  customarily  covered in opinions
                         requested in secondary underwritten offerings; or

                              (B)  in  the  case  of any  offering  that  is not
                         underwritten,   covering  the   effectiveness   of  the
                         registration statement;

                         (iii) in the case of an underwritten offering, cause to
                    be  delivered  at the time of  delivery  of any  Registrable
                    Securities sold pursuant thereto, letters from the Company's
                    independent  certified public  accountants  addressed to the
                    Holder and each  underwriter  stating that such  accountants
                    are independent public accountants within the meaning of the
                    Securities  Act  and  the  applicable  published  rules  and
                    regulations thereunder,  and otherwise in customary form and
                    covering  such  financial  and  accounting  matters  as  are
                    customarily covered by letters of the independent  certified

<PAGE>


                                                             Page 66 of 81 Pages

                    public  accountants  delivered in connection  with secondary
                    underwritten public offerings;

                         (iv) if an  underwriting  agreement  is  entered  into,
                    cause the same to set forth indemnification and contribution
                    provisions and procedures which are no less favorable to the
                    Holder and the Company than those contemplated by sections 8
                    and 9 hereof with  respect to all parties to be  indemnified
                    pursuant to such sections;

                         (v) deliver such documents and  certificates  as may be
                    reasonably  requested  by  the  Holder  of  the  Registrable
                    Securities  being  sold  or  the  managing   underwriter  or
                    underwriters, if any, to evidence compliance with clause (i)
                    above and with any  customary  conditions  contained  in the
                    underwriting  agreement,  if any, or other agreement entered
                    into by the Company;

               the  foregoing  in  this  paragraph  2(b)  shall  be done at each
               closing under any such  underwriting  or similar  agreement or as
               and to the extent required  thereunder;  provided,  however,  the
               foregoing  in  paragraph  2(b) shall not be required on more than
               two (2) occasions;

               (c) The Company shall make available for  inspection,  review and
               comment by a representative or representatives of the Holder, any
               underwriter  participating  in  any  disposition  pursuant  to  a
               Registration  Statement,  and any attorney or accountant retained
               by such Holder or underwriter, any such registration statement or
               amendment or supplement or any blue sky,  Nasdaq or other filing,
               all financial and other records,  pertinent  corporate  documents
               and properties of the Company as they may reasonably  request for
               the purpose,  and cause the  Company's  officers,  directors  and
               employees to supply all information  reasonably  requested by any
               such  representative,  underwriter,  attorney  or  accountant  in
               connection with such Registration Statement.

3.        Underwritten  Distribution.  If the Holder  intends to distribute  the
          --------------------------
Registrable  Securities  covered  by a  Registration  Statement  by  means of an
underwriting,  the Holder  shall so advise the Company and,  within  thirty (30)
days of the date thereof and without limiting the generality of other provisions
hereof,  the Company will prepare and file such  amendment or  amendments to the
Registration  Statement  and make such  other  filings  as may be  necessary  or
appropriate  to  effect  any  such  underwritten   distribution.   The  managing

<PAGE>


                                                             Page 67 of 81 Pages

underwriter  for any such  distribution  shall be an investment  banking firm of
national reputation selected by the Holders  participating in such distribution,
subject to the Company's consent, which shall not be unreasonably withheld.

4.        Multiple Holders. If there is more than one Holder, such Holders shall
          ----------------
act with  respect to their  rights  under  this  Registration  Rights  Agreement
according to the vote of a majority-in-interest.

5.        Expenses  of  Registration.  All  Registration  Expenses  incurred  in
          --------------------------
connection with any registration,  qualification or compliance  pursuant to this
Registration  Rights  Agreement  shall be borne by the Company,  and all Selling
Expenses shall be borne by the Holder.

6.        Registration  Delay or  Failure.  The  Company  acknowledges  that its
          -------------------------------
failure to register the Registrable  Securities in accordance with the Agreement
and this  Registration  Rights Agreement will cause the Holder to suffer damages
in an amount that will be difficult to ascertain.  Accordingly the parties agree
that it is appropriate to include herein a provision for liquidated  damages and
to compensate the Holder fairly for the additional risk undertaken by the Holder
resulting from the Company's delay or failure to effect such  registration.  The
parties  acknowledge and agree that the liquidated  damages provisions set forth
in the  Agreement  represent  the parties'  good faith  effort to quantify  such
damages and, as such, agree that the form and amount of such liquidated  damages
are  reasonable  and will not  constitute  a penalty;  provided,  however,  that
nothing in this  Section 6 shall limit the  Holder's  right to pursue  equitable
relief, including without limitation, specific performance.

          (a) If the Registration Statement covering the resale of the Shares is
          not declared effective by the  one-hundred-twentieth  (120th) calendar
          day  after the  Closing  Date,  then the  Applicable  Percentages  (as
          defined in the  Certificate of  Designation)  used in determining  the
          Conversion  Date  Market  Price  (as  defined  in the  Certificate  of
          Designation)  shall  each be  increased  by two and  one-half  (2 1/2)
          percentage points and the Applicable Percentages as so increased shall
          then  and  thereafter  be  applicable  to and upon  conversion  of the
          Preferred Stock in lieu and in place of the Applicable Percentages set
          forth in the Certificate of Designation.

          (b) If  such  Registration  Statement  still  has  not  been  declared
          effective by the  one-hundred-fifty-first  (151st)  calendar day after
          the Closing Date,  then the  Applicable  Percentages,  as  theretofore
          reduced pursuant to Section 6(a) hereof, shall be further increased by
          two and  one-half  (2 1/2)  percentage  points,  and,  as  further  so

<PAGE>

                                                             Page 68 of 81 Pages


          increased,  shall  then  and  thereafter  be  applicable  to and  upon
          conversion of the Preferred Stock.

          (c)   On   each   succeeding   thirtieth   (30th)   day   after   such
          one-hundred-fifty-first  (151st)  calendar day after the Closing Date,
          upon which such Registration Statement still has not become effective,
          the  Applicable  Percentages  as  theretofore  increased  pursuant  to
          Sections  6(a) and 6(b) hereof  shall be further  increased by another
          two (2) percentage points and, as further so increased, shall then and
          thereafter  be  applicable  to and upon  conversion  of the  Preferred
          Stock.

          (d) For the  avoidance of doubt,  the Company  shall not be subject to
          any liquidated damages provisions under this Agreement with respect to
          its  failure  to  register  on a timely  basis  any  Shares  issued or
          issuable with respect to any Existing Securities.

7.        Registration Procedures.  In the case of each registration effected by
the Company pursuant to this  Registration  Rights  Agreement,  the Company will
keep the Holder advised in writing as to initiation of each  registration and as
to the completion thereof. At its expense, the Company will use its best efforts
to:

          (a) Keep such  registration  effective  for the  period of sixty  (60)
          months  or until  all the  Securities  are sold or  eligible  for sale
          pursuant  to  Rule  144(k)  of the  SEC or any  successor  or  similar
          provision, whichever is earlier.

          (b) Furnish such number of prospectuses  and other documents  incident
          thereto as the Holder from time to time may reasonably request.

          (c) Notify the Holder of any event or circumstance the result of which
          is that the Company's  Registration  Statement or prospectus  included
          therein  contains an untrue  statement  of  material  fact or omits to
          state any material fact required to be stated  therein or necessary to
          make the  statements  therein not misleading and shall (i) in the case
          of any event or  circumstance  not provided for in clause (ii) below,,
          within thirty (30) business days of such  notification  or (ii) in the
          case of any acquisition,  merger or other similar material transaction
          requiring  additional  disclosure to correct any such untrue statement
          or  omission,  within sixty (60) days of such  notification,  amend or
          supplement  the  Registration  Statement or prospectus to correct such
          inaccuracy or disclose such development;  provided, however, that upon
                                                    --------  -------
          receipt of such  notice,  the  Holder  shall  immediately  discontinue

<PAGE>


                                                             Page 69 of 81 Pages


          dispositions of Registrable  Securities  thereunder until the Holder's
          receipt from the Company of a supplemented or amended  prospectus and,
          if so  requested  by the  Company,  the  Holder  shall  deliver to the
          Company all copies (other than  permanent  file copies in the Holder's
          possession)  of the  prospectus  covering the  Registrable  Securities
          current at the time of receipt of such notice;  and provided  further,
          that if the  Registration  Statement or  prospectus  is not amended or
          supplemented   so  as  to  remedy  any  inaccuracy  or  disclose  such
          development by the thirtieth (30th) business day in the case of clause
          (i), or the sixtieth  (60th)  business day in the case of clause (ii),
          in each case,  after notice of  inaccuracy  is given by the Company to
          the Holder,  then the Company shall issue Holder upon each  subsequent
          conversion by Holder of any Preferred Stock which was convertible into
          Common  Stock at any time from the  applicable  date upon  which  such
          Registration  Statement  was  required to be  supplemented  or amended
          (i.e.,  the thirtieth  (30th) business day or sixtieth (60th) business
          day  after   notification,   as  the  case  may  be)  (the   "Required
          Registration  Statement  Amendment  Date")  until  such  date  as  the
          Registration  Statement  is so amended  (the  "Registration  Statement
          Amendment Date"), such additional shares of Common Stock as would have
          been issuable to the Holder upon such  conversion  had the  Applicable
          Percentage  used in determining  the Conversion  Date Market Price for
          such  conversion been increased by the Amendment  Penalty  Discount in
          the  case of an  event  described  in  clause  (i) or the  Alternative
          Penalty  Discount in the case of an event described in clause (ii). As
          used herein,  (x) the "Amendment  Penalty  Discount"  shall  initially
          equal zero percent (0%) on a Required  Registration  Amendment Date in
          the case of an event described in clause (i) and shall increase by one
          percent (1%) for every fifth (5th) business day  thereafter  until the
          applicable   Registration   Statement   Amendment  Date  and  (y)  the
          Alternative  Penalty  Discount shall  initially equal two and one-half
          percent (2 1/2%) on a Required  Registration  Statement Amendment Date
          with respect to an event  described in clause (ii) and shall  increase
          by two and one-half  percent (2 1/2%) on the thirtieth (30th) business
          day thereafter if the applicable Registration Statement Amendment Date
          has not then occurred and shall increase by two percent (2%) for every
          thirtieth   (30th)  business  day  thereafter   until  the  applicable
          Registration Statement Amendment Date. For the avoidance of doubt, the
          Company shall not be required to issue any additional shares of Common
          Stock under this Agreement for a failure to maintain the  registration
          of any  Shares  issued  or  issuable  with  respect  to  any  Existing
          Securities.

8.        Indemnification.
          ---------------

<PAGE>

                                                             Page 70 of 81 Pages


          (a) Company Indemnity.  The Company will indemnify the Holder, each of
              -----------------
          its officers,  directors and partners, and each person controlling the
          Holder within the meaning of Section 15 of the  Securities Act and the
          rules and regulations  thereunder with respect to which  registration,
          qualification  or  compliance  has  been  effected  pursuant  to  this
          Registration Rights Agreement, and each underwriter,  if any, and each
          person  who  controls,  within  the  meaning  of  Section  15  of  the
          Securities  Act  and  the  rules  and  regulations   thereunder,   any
          underwriter,  against all claims,  losses, damages and liabilities (or
          actions  in  respect  thereof)  arising  out of or based on any untrue
          statement (or alleged  untrue  statement) of a material fact contained
          in any prospectus,  offering circular or other document (including any
          related registration statement,  notification or the like) incident to
          any such  registration,  qualification or compliance,  or based on any
          omission  (or  alleged  omission)  to state  therein a  material  fact
          required  to be stated  therein or  necessary  to make the  statements
          therein  not  misleading,  or  any  violation  by the  Company  of the
          Securities Act or any state securities law or in either case, any rule
          or  regulation  thereunder  applicable  to the Company and relating to
          action or inaction required of the Company in connection with any such
          registration,  qualification  or  compliance,  and will  reimburse the
          Holder, each of its officers,  directors and partners, and each person
          controlling  such Holder,  each such  underwriter  and each person who
          controls any such  underwriter,  for any legal and any other  expenses
          reasonably incurred in connection with investigating and defending any
          such claim,  loss,  damage,  liability  or action,  provided  that the
          Company  will not be liable in any such  case to the  extent  that any
          such claim,  loss,  damage,  liability or expense  arises out of or is
          based  on  any  untrue   statement  or  omission  based  upon  written
          information  furnished to the Company by Holder or the underwriter and
          stated to be  specifically  for use therein.  The indemnity  agreement
          contained  in this  Section  8(a) shall not apply to  amounts  paid in
          settlement  of any such loss,  claim,  damage,  liability or action if
          such settlement is effected  without the consent of the Company (which
          consent will not be unreasonably withheld).

          (b) Holder Indemnity.  The Holder will, if Registrable Securities held
              ----------------
          by it are included in the  securities  as to which such  registration,
          qualification or compliance is being effected,  indemnify the Company,
          each of its directors,  officers,  partners, and each underwriter,  if
          any,  of the  Company's  securities  covered  by  such a  registration
          statement,  each person who controls  the Company or such  underwriter
          within the meaning of Section 15 of the  Securities  Act and the rules
          and  regulations  thereunder,  each other Holder (if any), and each of
          their officers,  directors and partners,  and each person  controlling
          such other Holder against all claims,  losses, damages and liabilities
          (or actions in respect  thereof) arising out of or based on any untrue

<PAGE>


                                                             Page 71 of 81 Pages

          statement (or alleged  untrue  statement) of a material fact contained
          in any such registration statement,  prospectus,  offering circular or
          other document, or any omission (or alleged omission) to state therein
          a material fact required to be stated therein or necessary to make the
          statement  therein not  misleading  and will reimburse the Company and
          such  other  Holders  and  their  directors,  officers  and  partners,
          underwriters  or control  persons for any legal or any other  expenses
          reasonably  incurred in connection with investigating or defending any
          such claim,  loss,  damage,  liability or action,  in each case to the
          extent, but only to the extent, that such untrue statement (or alleged
          untrue  statement)  or omission (or alleged  omission) is made in such
          registration  statement,   prospectus,   offering  circular  or  other
          document in reliance upon and in conformity  with written  information
          furnished to the Company by Holder and stated to be  specifically  for
          use therein;  provided,  however, that the obligations of Holder shall
          not apply to amounts paid in  settlement  of any such claims,  losses,
          damages or  liabilities  if such  settlement  is effected  without the
          consent of Holder (which consent shall not be unreasonably withheld).

          (c)  Procedure.  Each party  entitled  to  indemnification  under this
               ---------
          Article  (the  "Indemnified  Party")  shall  give  notice to the party
          required  to  provide   indemnification  (the  "Indemnifying   Party")
          promptly  after such  Indemnified  Party has actual  knowledge  of any
          claim as to which  indemnity  may be  sought,  and  shall  permit  the
          Indemnifying  Party to assume  the  defense  of any such  claim in any
          litigation  resulting   therefrom,   provided  that  counsel  for  the
          Indemnifying Party, who shall conduct the defense of such claim or any
          litigation resulting  therefrom,  shall be approved by the Indemnified
          Party (whose  approval shall not be  unreasonably  withheld),  and the
          Indemnified  Party may  participate  in such  defense at such  party's
          expense,  and  provided  further  that the failure of any  Indemnified
          Party  to give  notice  as  provided  herein  shall  not  relieve  the
          Indemnifying Party of its obligations under this Article except to the
          extent  that the  Indemnifying  Party is actually  prejudiced  by such
          failure to provide notice.  No  Indemnifying  Party, in the defense of
          any such claim or litigation,  shall,  except with the consent of each
          Indemnified Party,  consent to entry of any judgment or enter into any
          settlement which does not include as an unconditional term thereof the
          giving by the claimant or plaintiff to such  Indemnified  of a release
          from all  liability  in  respect  to such  claim or  litigation.  Each
          Indemnified  Party shall furnish such information  regarding itself or
          the claim in question as an Indemnifying  Party may reasonably request
          in writing and as shall be reasonably  required in connection with the
          defense of such claim and litigation resulting therefrom.

<PAGE>

                                                             Page 72 of 81 Pages


9.        Contribution.  If the indemnification provided for in Section 8 herein
          ------------
is  unavailable  to the  Indemnified  Parties in respect of any losses,  claims,
damages or liabilities referred to herein, then each such Indemnifying Party, in
lieu of indemnifying such Indemnified Party, shall contribute to the amount paid
or payable by such Indemnified party as a result of such losses, claims, damages
or liabilities (i) as between the Company and the Holder on the one hand and the
underwriters  on the other,  in such proportion as is appropriate to reflect the
relative  benefits  received  by the  Company  and the Holder on the one hand or
underwriters,  as the  case  may be,  on the  other  from  the  offering  of the
Registrable  Securities,  or if such  allocation  is not permitted by applicable
law, in such  proportion  as is  appropriate  to reflect not only such  relative
benefits but also the  relative  fault of the Company on the one hand and of the
Holder or underwriters, as the case may be, on the other, in connection with the
statements  or  omissions  which  resulted in such  losses,  claims,  damages or
liabilities,  as well as any other relevant equitable considerations and (ii) as
between  the  Company  on the one  hand and the  Holder  on the  other,  in such
proportion as is appropriate to reflect the relative fault of the Company and of
the Holder in connection with such statements or omissions.

          The relative  benefits received by the Company on the one hand and the
Holder or the underwriters,  as the case may be, on the other shall be deemed to
be in the  same  proportion  as (x)  the  proceeds  from  the  offering  (net of
underwriting  discounts and commissions but before deducting  expenses) received
by the Company  from the initial sale of the  Preferred  Stock by the Company to
the Holder  pursuant to the  Agreement  and from the exercise of the Warrants by
the  Holder  bear  to (y)  the  gain  realized  by  such  Holder  or  the  total
underwriting discounts and commissions received by the underwriters as set forth
in the  table on the  cover  page of the  prospectus,  as the  case may be.  The
relative fault of the Company on the one hand and of the Holder or underwriters,
as the case may be, on the other shall be  determined  by  reference  to,  among
other things,  whether the untrue or alleged untrue statement of a material fact
or  omission to state a material  fact  relates to  information  supplied by the
Company, by the Holder or by the underwriters.

          In no  event  shall  the  obligation  of  any  Indemnifying  Party  to
contribute under this Section 9 exceed the amount that such  Indemnifying  Party
would  have  been   obligated   to  pay  by  way  of   indemnification   if  the
indemnification  provided  for  under  Section  8(a) or  8(b)  hereof  had  been
available under the circumstances.

          The  Company  and the  Holder  agree  that it  would  not be just  and
equitable if contribution pursuant to this Section 9 were determined by pro rata
allocation  (even if the Holder or the  underwriters  were treated as one entity
for such  purpose)  or by any other  method of  allocation  which  does not take

<PAGE>

                                                             Page 73 of 81 Pages

account of the equitable considerations referred to in the immediately preceding
paragraphs.  The amount paid or payable by an  Indemnified  Party as a result of
the losses,  claims,  damages  and  liabilities  referred to in the  immediately
preceding paragraphs shall be deemed to include,  subject to the limitations set
forth above, any legal or other expenses reasonably incurred by such Indemnified
Party in connection  with  investigating  or defending any such action or claim.
Notwithstanding  the provisions of this section,  no Holder or underwriter shall
be required to contribute any amount in excess of the amount by which (i) in the
case of the  Holder,  the net  proceeds  received by the Holder from the sale of
Registrable Securities or (ii) in the case of an underwriter, the total price at
which the Registrable  Securities  purchased by it and distributed to the public
were offered to the public exceeds,  in any such case, the amount of any damages
that the Holder or  underwriter  has otherwise been required to pay by reason of
such untrue or alleged  untrue  statement  or omission or alleged  omission.  No
person  guilty of  fraudulent  misrepresentation  (within the meaning of Section
11(f) of the Securities Act) shall be entitled to  contribution  from any person
who was not guilty of such fraudulent misrepresentation.

10.       Survival.  The  Indemnity  and  contribution  agreements  contained in
          --------
Sections 8 and 9 and the  representations and warranties of the Company referred
to in  Section  2(b)(i)  shall  remain  operative  and in full  force and effect
regardless of (i) any termination of this Agreement, (ii) any investigation made
by or on behalf of any  Indemnified  Party or by or on behalf of the Company and
(iii) the  consummation  of the sale or  successive  resales of the  Registrable
Securities.

11.       Information from Holder.  The Holder shall furnish to the Company such
          -----------------------
information  regarding such Holder and the distribution  proposed by such Holder
as the Company  may  reasonably  request in writing  and as shall be  reasonably
required  in  connection  with any  registration,  qualification  or  compliance
referred to in this Agreement.

12.       Transfer or Assignment of Registration  Rights.  The rights granted to
          -----------------------------------------------
Purchaser by the Company under this  Registration  Rights Agreement to cause the
Company to register Registrable Securities,  may be transferred or assigned to a
transferee or assignee,  provided  that the Company is given  written  notice by
Holder  at the time of or  within a  reasonable  time  after  said  transfer  or
assignment,  stating the name and  address of said  transferee  or assignee  and

<PAGE>


                                                             Page 74 of 81 Pages

identifying  the securities with respect to which such  registration  rights are
being  transferred  or assigned,  and provided  further that the  transferee  or
assignee of such rights is not deemed by the board of  directors of the Company,
in its  reasonable  judgment,  to be a competitor  of the Company,  and provided
further  that the  transferee  or assignee of such rights  agrees to be bound by
this Registration Rights Agreement.

13.       Miscellaneous.
          -------------

          (a) Entire Agreement.  This Registration Rights Agreement contains the
              ----------------
entire  understanding  and agreement of the parties,  and may not be modified or
terminated except by a written agreement signed by both parties.

          (b) Notices.  Any notice or other communication  required or permitted
              -------
to be given  hereunder  shall be in writing and shall be effective (i) upon hand
delivery or delivery by telex (with correct answer back  received),  telecopy or
facsimile, at the address or number designated below (if delivered on a business
day during normal  business  hours where such notice is to be received),  or the
first  business  day  following  such  delivery  (if  delivered  other than on a
business day during normal  business  hours where such notice is to be received)
or (ii) on the  second  business  day  following  the date of mailing by express
courier  service,  fully  prepaid,  addressed  to such  address,  or upon actual
receipt of such  mailing,  whichever  shall first occur.  The addresses for such
communications shall be:


               to the Company:

                              Geotek Communications, Inc.
                              20 Craig Road
                              Montvale, NJ 07645
                              Attention: General Counsel and Secretary
                              Fax: (201) 930-9614

               with copies to:

                              Klehr, Harrison, Harvey, Branzburg & Ellers
                              1401 Walnut Street
                              Philadelphia, PA 19102
                              Attention: Leonard M. Klehr, Esq.
                              Fax: (215) 568-6603


               to the Purchaser:

<PAGE>

                                                             Page 75 of 81 Pages



                         ------------------------------------------------------
                         ------------------------------------------------------
                         ------------------------------------------------------
                         Fax:    (___) ___-____

               with copies to:


                         ------------------------------------------------------
                         ------------------------------------------------------
                         ------------------------------------------------------
                         Fax:    (___) ___-____




               with copies to:


Either party  hereto may from time to time change its address for notices  under
this Section  13(b) by giving at least 10 days'  written  notice of such changed
address to the other party hereto.

          (c) Gender of Terms.  All terms used herein shall be deemed to include
              --------------- 
the  feminine  and the neuter,  and the  singular  and the plural as the context
requires.

          (d) Governing Law; Consent to Jurisdiction.  This Registration  Rights
              --------------------------------------
Agreement  shall be governed by and construed in accordance with the laws of the
State of New York without  regard to principles of conflicts of law or choice of
law,  except for matters  arising under the  Securities  Act or the Exchange Act
which matters shall be construed and  interpreted in accordance  with such Acts.
The Company  hereby agrees that all actions or proceedings  arising  directly or
indirectly from or in connection with this Registration  Rights Agreement shall,
at the  Purchaser's  sole option,  be litigated only in the Supreme Court of the
State of New York or the United States District Court for the Southern  District
of New York located in New York County,  New York.  The Company  consents to the
jurisdiction  and venue of the foregoing courts and consents that any process or
notice  of  motion or other  application  to  either  of said  courts or a judge
thereof may be served  inside or outside  the State of New York or the  Southern
District of New York by registered mail, return receipt  requested,  directed to
the Company at its address set forth in this Registration  Rights Agreement (and
service so made shall be deemed  complete  five (5) days after the same has been
posted as  aforesaid)  or by personal  service or in such other manner as may be
permissible under the rules of said court.

<PAGE>


                                                             Page 76 of 81 Pages


(e) Titles.  The titles used in this Registration  Rights Agreement are used for
    ------
convenience only and are not to be considered in construing or interpreting this
Registration Rights Agreement.

(f) Additional Registration Rights.
    ------------------------------

          (ii) The  Purchaser  acknowledges  that the Company  does not have any
obligation  to include any  Registrable  Securities  issuable  upon  conversion,
exercise  or  otherwise   with  respect  to  the  Existing   Securities  in  the
registration  statement as initially filed with the SEC pursuant to Section 2(a)
hereof.  Notwithstanding the foregoing,  in the event the Purchaser shall at any
time request in writing that the Company  amend such  registration  statement to
include  therein  any  or  all  of  the  Registrable  Securities  issuable  upon
conversion,  exercise or otherwise with respect to the Existing Securities,  the
Company  shall  promptly  take such  actions  to amend or  otherwise  effect the
inclusion of such Registrable Securities in such registration statement.

          (ii)  The  Company  has  previously   granted  the  Purchaser  certain
registration  rights with respect to Purchaser's  Common Stock which it now owns
or hereafter acquires pursuant to each of those Stock Purchase  Agreements dated
November 1, 1993 and September 28, 1994 (the "Stock Purchase  Agreements").  The
Company acknowledges and agrees that the Registrable  Securities actually issued
and  issuable  pursuant to the  Preferred  Stock and Warrants  shall  constitute
"Registrable  Securities"  for  purposes of the Stock  Purchase  Agreements  and
Holder  shall be  entitled  to the  rights set forth in Section 6 of each of the
Stock Purchase Agreements with respect to such Registrable  Securities.  For the
avoidance  of doubt,  all shares of Common Stock  issuable  upon  conversion  or
exercise of Preferred  Stock and Warrants  (whether or not such shares of Common
Stock have been issued) shall be counted as "secondary  securities"  (as defined
in the Stock  Purchase  Agreements)  for purposes of  determining  the number of
secondary  securities a holder may include in an underwritten  offering pursuant
to Section 6.7 of the Stock Purchase Agreements.



                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

                                                             Page 77 of 81 Pages


          IN WITNESS WHEREOF,  the parties hereto have caused this  Registration
Rights Agreement to be duly executed as of the date first above written.


                                   GEOTEK COMMUNICATIONS, INC.

                                   By:  /s/
                                        ---------------------------------------
                                        Name:
                                        Title:

                                   S-C RIG INVESTMENTS-III, L.P.

                                   By:  S-C Rig Co.
                                        Its general partner


                                        By:  /s/  Peter Hurwitz
                                             ----------------------------------
                                             Name:  Peter Hurwitz
                                             Title: Vice President

                                   WINSTON PARTNERS II LLC

                                   By:  Chatterjee Advisors L.L.C.
                                        Its manager

                                        By:  /s/  Peter Hurwitz
                                             ----------------------------------
                                             Name:   Peter Hurwitz
                                             Title:  Manager

                                   WINSTON PARTNERS II LDC


                                   By:  /s/  Peter Hurwitz
                                        ---------------------------------------
                                        Name:   Peter Hurwitz
                                        Title:  Attorney-in-Fact


                                   WINSTON PARTNERS L.P.

                                   By:  Chatterjee Fund Management, L.P.,
                                        its general partner

                                        By:  /s/ Peter Hurwitz
                                             ----------------------------------
                                             Name:   Peter Hurwitz
                                             Title:  Attorney-in-Fact


                                                             Page 78 of 81 Pages


                                   EXHIBIT T





January 23, 1997


Board of Directors
Geotek Communications, Inc.
20 Craig Road
Montvale, NJ  07645

        Re:    Regulation D Offering
               ---------------------

Ladies and Gentlemen:

          Reference is made to the Convertible Securities Subscription Agreement
(the  "Agreement")  of even date and delivery  herewith  between the undersigned
persons,  (each an "Investor" and  collectively,  the  "Investors"),  and Geotek
Communications, Inc. (the "Company"). Capitalized terms contained in this letter
shall have the same meanings ascribed to them in the Agreement.

          In addition to the  representations  and  covenants  of the  Investors
contained in the  Agreement,  the Company has required all  Investors to execute
and deliver this letter  pursuant to which the  Investors  further  covenant and
agree as follows:

          1. In the event that any Investor,  individually or collectively  with
any other Investor,  engages in any Block Trade Sales (as hereinafter  defined),
such  Investor  agrees to complete  those Block Trade Sales at a price(s)  which
would be (x) on a  neutral  or  uptick  versus  the  price  of the  last  market
transaction in the Common Stock of the Company and (y) greater than the previous
day's  closing  market price of the Common  Stock of the  Company.  For purposes
herein,  Block  Trade Sales shall mean any  executed  sale of more than  100,000
shares of the Common Stock of the Company.

          2. In the event an  Investor  (or any of such  Investor's  affiliates)
engages in short sales  transactions  or other hedging  activities  during a day
which such Investor  utilizes to determine the Conversion Date Market Price (the
"Pricing  Period")  which  involve,  among other things,  sales of shares of the
Common  Stock of the  Company,  the  Investor  will  place (or  shall  cause its
affiliate  to place)  its sale  orders  for  common  stock in the course of such
activities  so as not to  complete  or effect any such sale on any  trading  day
during  the  Pricing  Period  at a price  which is lower  than the  lowest  sale
effected on such day by persons other than the Investor and its  affiliates.  In
addition,  in each computation of the Average Stock Price,  each Investor agrees
to calculate  the Average  Stock Price  without  including any trades for common
stock that such Investor or any of its  affiliates  executed on the day utilized


<PAGE>

                                                             Page 79 of 81 Pages

in determining the Conversion Date Market Price.

          3. Convertible Percentage.  Unless the Company and holders of at least
66 2/3% of the Series P Preferred Stock of the Company (the  "Preferred  Stock")
otherwise agree,  each holder of Preferred Stock may convert,  in the aggregate,
not more than that  percentage of Preferred  Stock held by such holder set forth
in the column  below (the  "Convertible  Percentage")  opposite  the time period
during  which any  Holder  Conversion  Date (as  defined in the  Certificate  of
Designation) occurs; provided,  however, that in the event the Company effects a
                     --------   -------
Disposition  Transaction  (as defined in the  Certificate of  Designation),  the
Convertible  Percentage shall become one hundred percent (100%) effective on the
date such Disposition Transaction is consummated:

- -------------------------------------------------------------------------------
            Holder Conversion Date
   (Number of Days after December 31, 1996)  Percentage of all Preferred Shares
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
                   0 to 90                                        0%
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
                  91 to 180                                      20%
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
                  181 to 365                                     50%
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
                  366 to 540                                     80%
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
              541 and thereafter                                 100%
- -------------------------------------------------------------------------------

          4. Except as permitted in Section 13 of the Certificate of Designation
for the Preferred Stock,  during any Trading Restriction Period or any Stand-Off
Period (each as defined in the  Certificate  of  Designation  for the  Preferred
Stock),  each holder of  Preferred  Stock shall be  prohibited  from trading any
Common Stock.  Notwithstanding  the  foregoing,  nothing  herein shall prevent a
holder of  Preferred  Stock from  converting  any shares of  Preferred  Stock or
exercising  any  Warrants  during a Trading  Restriction  Period or a  Stand-Off
Period.

          5. No Investor  shall  effect any  transfer of any share of  Preferred
Stock  unless,  prior  to and as a  condition  of such  transfer,  the  proposed
transferee  executes  and delivers to the Company a  counterpart  of this letter
agreement  agreeing to comply  with and be bound by all of its terms;  provided,
                                                                       --------
however,  that in the event that the proposed  transferee is not an affiliate of
- ------- 
any of the Investors,  such proposed  transferee must execute and deliver to the
Company a letter agreement in the form of that certain Letter  Agreement,  dated
as of December 31, 1996, by and between the Company and the  subscribers  of the
Company's   Series  O  Convertible   Preferred   Stock  (the  "Series  O  Letter
Agreement"), agreeing to comply and be bound by all of its terms with respect to

<PAGE>


                                                             Page 80 of 81 Pages

the Preferred  Stock. A copy of the Series O Letter Agreement is attached hereto
as Exhibit A.

          6. For purposes of complying  with any  applicable  provisions  of the
Hart-Scott-Rodino  Antitrust  Improvements  Act of 1976,  as  amended  (the "HSR
Act"),  each  holder of  Preferred  Stock and the  Company  (as the case may be)
agrees to provide promptly to the other,  upon the other's written request,  all
reasonable  requested  information  regarding itself and its affiliates which is
necessary  for  the  requesting  party  to  file  any   notifications  or  other
information  with  the  United  States  Justice   Department  or  Federal  Trade
Commission  pursuant to the HSR Act. In the event a holder of Preferred Stock is
required to file a premerger  notification under the HSR Act with respect to the
transactions  contemplated  by the Agreement,  the holder of Preferred Stock and
the Company shall promptly  prepare and make all such required filings and shall
request early termination of the waiting period with respect thereto.

          7. For so long as an Investor  owns any Preferred  Stock,  on the last
day of each quarterly  calendar  period  beginning March 31, 1997, such Investor
shall deliver to the Company a certificate  signed by one of its duly authorized
officers or agents  stating that it has  complied  with all of the terms of this
letter  agreement,  or if it has not so  complied,  the  details  of  each  such
violation.  An  Investor's  failure to deliver any such  certificate  under this
Section 7 shall not constitute a violation of this letter agreement for purposes
of Section 8 unless such  failure  continues  for a period of ten (10)  business
days after its receipt of notice from the Company of such failure.

          8. In the event an Investor  violates  any of the terms of this letter
agreement,  the Company  shall be  entitled,  in addition to any other  remedies
available to it, to recover from such Investor an amount equal to the greater of
(i) all profits derived by such Investor in the  transactions  conducted by such
Investor in  violation of this letter  agreement  and (ii) $10,000 for each such
violation.  Such amount shall be payable in United States  dollars,  free of any
tax or  other  deduction,  and  shall  include  interest  from  the  date of the
applicable  violation of this  Agreement to the date on which the award is paid,
at a rate determined by the arbitrators referred to below.

          9. The Company hereby agrees to seek the approval of its  shareholders
at their annual meeting in 1997 of a vote approving the issuance of Common Stock
in  conjunction  with (i) the  exercise of  conversion  rights  contained in the
Certificate  of  Designation  for the  Preferred  Stock and (ii) the exercise of
Warrants,  in each case to the extent that the  exercise of those  rights  would
result in the Company  issuing a number of shares of Common Stock which  exceeds
twenty  percent (20%) of the Company's  Common Stock  outstanding as of the date
hereof.

<PAGE>


                                                             Page 81 of 81 Pages

          10. Any claim,  dispute or controversy arising out of or in connection
with this  Agreement  shall be settled by binding  arbitration  conducted in New
York,  New York  before  three  arbitrators,  with  each  party  appointing  one
arbitrator and those two arbitrators  choosing the third arbitrator.  If a party
hereto fails to appoint an arbitrator  within fifteen (15) days after  receiving
notice of the other party's selection of an arbitrator, the last two arbitrators
shall be selected by the first  arbitrator.  Any arbitration  hereunder shall be
conducted in  accordance  with the rules  observed by the  American  Arbitration
Association. The parties hereto consent to the jurisdiction of the courts of the
Supreme Court of New York and the United States  District Court for the Southern
District  of New York for  purposes  of  enforcement  of any final  award by the
arbitrators.

                                   Very truly yours,

                                   Investor:


                                   By:
                                        ---------------------------------------
                                   Its:      
                                        ---------------------------------------


Agreed and accepted on January 23, 1997

GEOTEK COMMUNICATIONS, INC.


By:
     ------------------------------------
Title:
     ------------------------------------


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