GEOTEK COMMUNICATIONS INC
SC 13D/A, 1999-01-12
RADIO & TV BROADCASTING & COMMUNICATIONS EQUIPMENT
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D
                                 (Rule 13d-101)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13d-2(a)

                               (Amendment No. 17)*

                           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.
                               590 Madison Avenue
                            New York, New York 10022
                                 (212) 872-1000
                    ------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                December 31, 1998
                    -----------------------------------------
                      (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(e), 13d-1(f) or 13d-1(g), check the following box
[ ].

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the  Schedule,  including  all  exhibits.  See Rule 13d-7(b) for other
parties to whom copies are to be sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

                         Continued on following page(s)
                               Page 1 of 24 Pages
                             Exhibit Index: Page 21


<PAGE>


                                                              Page 2 of 24 Pages

                                  SCHEDULE 13D
CUSIP No. 373654102

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*

                  Not applicable

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                                 18,633,701
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   18,633,701
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            18,633,701/1/

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

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

                                            12.04%/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 has the right to acquire under certain circumstances.


<PAGE>


                                                              Page 3 of 24 Pages

                                  SCHEDULE 13D
CUSIP No. 373654102

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*

                  Not applicable

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                                 18,633,701
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   18,633,701
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            18,633,701/1/

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

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

                                            12.04%/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 has the right to acquire under certain circumstances.


<PAGE>


                                                              Page 4 of 24 Pages

                                  SCHEDULE 13D

CUSIP No. 373654102

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*

                  Not applicable

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                                 2,438,904
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   2,438,904
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            2,438,904/1/

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

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

                                    1.70%/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 has the right to acquire under certain circumstances.


<PAGE>


                                                              Page 5 of 24 Pages

                                  SCHEDULE 13D

CUSIP No. 373654102

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*

                  Not applicable

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                                 2,438,904
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   2,438,904
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            2,438,904/1/

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

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

                                    1.70%/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 has the right to acquire under certain circumstances.


<PAGE>


                                                              Page 6 of 24 Pages

                                  SCHEDULE 13D
CUSIP No. 373654102

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*

                  Not applicable

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 Islands

                           7        Sole Voting Power
  Number of                                 1,768,285
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   1,768,285
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            1,768,285/1/

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

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

                                            1.23%/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 has the right to acquire under certain circumstances.


<PAGE>


                                                              Page 7 of 24 Pages

                                  SCHEDULE 13D
CUSIP No. 373654102

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*

                  Not applicable

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                                 884,107
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   884,107
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            884,107/1/

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

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

                                            0.62%/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 has the right to acquire under certain circumstances.


<PAGE>


                                                              Page 8 of 24 Pages

                                  SCHEDULE 13D
CUSIP No. 373654102

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*

                  Not applicable

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                                 2,652,392
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   2,652,392
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            2,652,392/1/

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

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

                                            1.84%/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 has the right to acquire under certain circumstances.


<PAGE>


                                                              Page 9 of 24 Pages

                                  SCHEDULE 13D
CUSIP No. 373654102

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*

                  Not applicable

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                                 2,652,392
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   2,652,392
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            2,652,392/1/

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

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

                                            1.84%/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 has the right to acquire under certain circumstances.


<PAGE>


                                                             Page 10 of 24 Pages

                                  SCHEDULE 13D
CUSIP No. 373654102

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*

                  Not applicable

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

6        Citizenship or Place of Organization

                  United States

                           7        Sole Voting Power
  Number of                                 5,331,296
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  18,633,701
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   5,331,296
    With
                           10       Shared Dispositive Power
                                            18,633,701

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            23,964,997/1/

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

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

                                             15.42%/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 has the right to acquire under certain circumstances.


<PAGE>


                                                             Page 11 of 24 Pages

                                  SCHEDULE 13D
CUSIP No. 373654102

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

                  GEORGE SOROS

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

3        SEC Use Only

4        Source of Funds*

                  Not applicable

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

6        Citizenship or Place of Organization

                  United States

                           7        Sole Voting Power
  Number of                                 0
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  18,633,701
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   0
    With
                           10       Shared Dispositive Power
                                            18,633,701

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            18,633,701/1/

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

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

                                             12.04%/1/

14       Type of Reporting Person*

         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 has the right to acquire under certain circumstances.


<PAGE>


                                                             Page 12 of 24 Pages

                  This Amendment No. 17 to Schedule 13D relates to the shares of
common stock,  $0.01 par value (the "Shares"),  of Geotek  Communications,  Inc.
(the  "Issuer").  This  Amendment  No.  17  supplementally  amends  the  initial
statement on Schedule 13D dated November 9, 1993 and all  subsequent  amendments
thereto (collectively,  the "Initial Statement"). This Amendment No. 17 is being
filed by the Reporting  Persons to report that Mr. George Soros currently may be
deemed to have  shared  beneficial  ownership  over  certain  Shares  previously
reported  by other  Reporting  Persons.  There  have been no  transactions  with
respect to the Shares over the last 60 days.  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");

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

                  (x)   George Soros ("Mr. Soros").

                  This  statement  constitutes an initial filing with respect to
                  Mr. Soros.


                              The Reporting Persons

Mr. Soros
- ---------

                  The  principal  occupation  of  Mr.  Soros,  a  United  States
citizen, is direction of the activities of Soros Fund Management LLC, a Delaware
limited liability  company ("SFM LLC"),  which is carried out in his capacity as
Chairman  of SFM LLC.  Mr.  Soros has his  principal  place of  business  at 888
Seventh Avenue,  33rd Floor,  New York, New York 10106,  the principal office of
SFM LLC.



<PAGE>


                                                             Page 13 of 24 Pages

                  During the past five years,  none of the Reporting Persons 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.

                  The Shares 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 their margin accounts,
subject to applicable federal margin regulations,  stock exchange rules and such
firm's credit policies.  The Shares which may be held in the margin accounts 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
or disposed of from the accounts of the  Reporting  Persons were acquired for or
disposed of for  investment  purposes.  From time to time,  employees of certain
entities  affiliated  with Dr.  Chatterjee  may engage in  discussions  with the
Issuer with  respect to future plans and  proposals of the Issuer,  including as
may relate to transactions  described in subparagraphs (a) through (j) of Item 4
of  Schedule  13D.  Except as may relate to any such  discussions,  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,  or cause
to be acquired,  additional securities of the Issuer, to dispose, or cause to be
disposed 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  remaining  Series P Stock held by the Reporting
Persons  after the  conversion  referred to in Item 3, the  aggregate  number of
Shares  of which  each of S-C Rig III and the  General  Partner  may be deemed a
beneficial  owner is  18,633,701  (approximately  12.04% 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 not herein reported as being converted).  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,  (vii)  510,000  Shares  issuable  upon  exercise of the 510,000
Series P Initial  Warrants and (viii)  7,543,252  Shares held for the account of
S-C Rig III.

         As reported in  Amendment  No. 10 to the Initial  Statement on Schedule
13D filed by the Reporting Persons, the number of Shares into which the Series P
Stock is  convertible  depends,  in part, on the "Average  Stock Price" (as such
term is defined in  Amendment  No. 10) of the  Shares.  For the  purposes of the


<PAGE>


                                                             Page 14 of 24 Pages

remainder  of this Item 5, in  determining  the number of Shares  into which the
remaining  Series P Stock will be convertible,  an assumption has been made that
the Average  Stock Price is $1.00000  per Share.  This price  approximates  the
trading price of Shares prior to the  bankruptcy  of the Issuer,  as reported in
Amendment  No. 14. Based on this price,  each share of remaining  Series P Stock
would be convertible into approximately  50,000 Shares. The Shares are no longer
listed on NASDAQ. The last trading price per Share was approximately $.09375. As
a result,  if the remaining  Shares of Series P Stock were converted  today, the
Reporting  Person  would be  entitled to  significantly  more Shares than as set
forth herein.

         Assuming the conversion of all of the remaining 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 21,633,701
(approximately  13.72% 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 60
shares of Series P Stock into approximately 3,000,000 Shares.

                  (ii)  Excluding  the  remaining  Series  P  Stock  held by the
Reporting  Persons  after the  conversion  referred to in Item 3, the  aggregate
number  of  Shares  of  which  each of  Winston  L.P.  and CFM may be  deemed  a
beneficial owner is 2,438,904 (approximately 1.70% 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 not herein reported as being converted).  This number consists of
(i) the 170,000  Shares  issuable  upon the  exercise  of the  170,000  Series P
Initial  Warrants held for the account of Winston L.P. and (ii) 2,268,904 Shares
held for the account of Winston L.P.

         Based on the  assumptions  set forth above with respect to the Series P
Stock,  assuming the conversion of all of the remaining  Series P Stock held for
the account of Winston  L.P.,  the  aggregate  number of Shares of which each of
Winston  L.P.   and  CFM  may  be  deemed  a   beneficial   owner  is  3,438,904
(approximately  2.37% 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 20
shares of Series P Stock into approximately 1,000,000 Shares.

                  (iii)  Excluding  the  remaining  Series  P Stock  held by the
Reporting  Persons  after the  conversion  referred to in Item 3, the  aggregate
number of  Shares  of which  Winston  LDC may be  deemed a  beneficial  owner is
1,768,285  (approximately  1.23% 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 not herein
reported as being converted). 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,  (iii) 113,333
Shares issuable upon the exercise of the 113,333 Series P Initial Warrants,  and
(iv) 1,554,114 Shares held for the account of Winston LDC.

         Based on the  assumptions  set forth above with respect to the Series P
Stock,  assuming the conversion of all of the remaining  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 2,434,785  (approximately 1.68% 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  13.33  shares  of  Series  P  Stock  into
approximately 666,500 Shares.



<PAGE>


                                                             Page 15 of 24 Pages

                  (iv)  Excluding  the  remaining  Series  P  Stock  held by the
Reporting  Persons  after the  conversion  referred to in Item 3, the  aggregate
number of  Shares  of which  Winston  LLC may be  deemed a  beneficial  owner is
884,107  (approximately  0.62% 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 not herein
reported as being converted). 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,  (iii) 56,667
Shares issuable upon the exercise of the 56,667 Series P Initial  Warrants,  and
(iv) 777,142 Shares held for the account of Winston LLC.

         Based on the  assumptions  set forth above with respect to the Series P
Stock,  assuming the conversion of all of the remaining  Series P Stock held for
the  account  of Winston  LLC,  the  aggregate  number of Shares of which may be
deemed a beneficial owner is 1,217,607  (approximately  .85% 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  6.67  shares  of  Series  P  Stock  into
approximately 333,500 Shares.

                  (v)  Excluding  the  remaining  Series  P  Stock  held  by the
Reporting  Persons  after the  conversion  referred to in Item 3, the  aggregate
number of Shares of which each of Chatterjee Advisors and Chatterjee  Management
may be deemed a beneficial owner is 2,652,392  (approximately 1.84% 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 not herein as being  converted).  This number
consists  of (i)  1,768,285  Shares  which  Winston  LDC  may be  deemed  to own
beneficially  and (ii)  884,107  Shares  which  Winston LLC may be deemed to own
beneficially.

         Based on the  assumptions  set forth above with respect to the Series P
Stock,  assuming the conversion of all of the remaining  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 3,652,392 (approximately 2.52% of the total number of Shares
which would be  outstanding  assuming the exercise or  conversion by Winston LDC
and Winston LLC of all of the convertible securities held for its account). This
number  assumes  the  conversion  of 20 shares  of  Series P Stock  held for the
accounts of Winston LLC and Winston LDC into approximately 1,000,000 Shares.

                  (vi)  Excluding  the  remaining  Series  P  Stock  held by the
Reporting  Persons  after the  conversion  referred to in Item 3, the  aggregate
number of Shares of which Dr.  Chatterjee  may be deemed a  beneficial  owner is
23,964,997  (approximately  15.42% 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 not herein  reported  as being  converted).  This  number  consists of (i)
18,633,701 Shares which S-C Rig III and the General Partner may be deemed to own
beneficially,  (ii) 40,000  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) 2,652,392  Shares which
Chatterjee Advisors and Chatterjee Management may be deemed to own beneficially,
and (v) the 2,438,904  Shares of which Winston L.P. and CFM may be deemed to own
beneficially.

         Based on the  assumptions  set forth above with respect to the Series P
Stock,  assuming the conversion of all of the remaining  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



<PAGE>


                                                             Page 16 of 24 Pages

owner is 28,964,997  (approximately 18.05% total number of Shares which would be
outstanding  assuming the exercise or conversion  by S-C Rig III,  Winston L.P.,
Winston LDC and Winston LLC of all of the convertible  securities held for their
accounts).  This number  assumes the  conversion of 100 shares of Series P Stock
held for the accounts of S-C Rig III, Winston L.P.,  Winston LDC and Winston LLC
into approximately 5,000,000 Shares.

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

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

                        Dr.  Chatterjee  may be deemed to have the sole power to
vote and  dispose of the 240,000  Shares  issuable  upon  exercise of the 40,000
options held directly by him and the 200,000 options held by XTEC.

                        Dr.  Chatterjee  also may be deemed to have shared power
to direct the voting and  disposition  of the Shares held,  or issuable upon the
conversion or exercise of all of the convertible  securities  reported herein as
being held, for the account of S-C Rig III.

                  (vii) Mr.  Soros may be deemed to have shared  power to direct
the voting and  disposition  of the Shares held, or issuable upon the conversion
or exercise of all of the convertible  securities reported herein as being held,
for the account of S-C Rig III.

         (c)            There have been no transactions effected with respect to
the Shares since  November 12, 1998 (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


<PAGE>


                                                             Page 17 of 24 Pages

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  of 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 40,000 options described herein as being
held directly for his personal account.

                  (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.

                  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, each of such persons or entities may borrow 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 set forth herein,  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.

                  Z. Joint Filing  Agreement,  dated as of January 11, 1999,  by
and among S-C Rig III, the General  Partner,  Winston  L.P.,  CFM,  Winston LDC,
Winston LLC, Chatterjee Advisors, Chatterjee Management, Purnendu Chatterjee and
George Soros.




<PAGE>


                                                             Page 18 of 24 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 11, 1999                      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 19 of 24 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 20 of 24 Pages

                                  GEORGE SOROS


                                   By:       /S/ MICHAEL C. NEUS
                                             ----------------------------------
                                             Michael C. Neus
                                             Attorney-in-Fact


<PAGE>


                                                            Page 21 of 24 Pages

                                  EXHIBIT INDEX

                                                                         PAGE

Z.        Joint Filing Agreement, dated as of January 11, 1999, 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,   Purnendu
          Chatterjee and George Soros..............                         22






                                                             Page 22 of 24 Pages

                                    EXHIBIT Z

                             JOINT FILING AGREEMENT

               The  undersigned  hereby agree that the statement on Schedule 13D
with respect to the Common Stock of Geotek  Communications,  Inc., dated January
11, 1999 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 11, 1999                      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 24 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 24 of 24 Pages

                                  GEORGE SOROS


                                   By:       /S/ MICHAEL C. NEUS
                                             ----------------------------------
                                             Michael C. Neus
                                             Attorney-in-Fact

                                                      


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