EXHIBIT 10.59


                           TRIMBLE NAVIGATION LIMITED
                             
                             1993 STOCK OPTION PLAN
                            (as amended May 5, 1998)

     1.  Purposes of the Plan.  The  purposes  of this Stock  Option Plan are to
attract and retain the best  available  personnel for  positions of  substantial
responsibility, to provide additional incentive to the Employees and Consultants
of the Company and to promote the success of the Company's business.

     Options  granted  hereunder  may  be  either  Incentive  Stock  Options  or
Nonstatutory  Stock Options,  at the discretion of the Board and as reflected in
the terms of the written option agreement.

     2. Definitions. As used herein, the following definitions shall apply:

        (a)  "Administrator"  means the Board or any of its Committees appointed
pursuant to Section 4 of the Plan.

        (b) "Board" shall mean the Committee, if one has been appointed,  or the
Board of Directors of the Company, if no Committee is appointed.

        (c) "Code" shall mean the Internal Revenue Code of 1986, as amended.

        (d)  "Committee"  shall mean the Committee  appointed  by the  Board  of
Directors in accordance with  paragraph (a)  of Section 4 of the Plan, if one is
appointed.

        (e) "Common Stock" shall mean the Common Stock of the Company.

        (f)  "Company"  shall  mean  Trimble  Navigation Limited,  a California
corporation.

        (g) "Consultant" shall mean any person who is engaged by the Company or 
any Parent or Subsidiary to render  consulting  services and is compensated for
such consulting  services,  and any director of the Company  whether compensated
for such  services  or not,  provided  that the term  Consultant  shall not  
include directors  who are  not  compensated  for  their  services  or are paid 
only a director's fee by the Company.

        (h) "Continuous Status as an Employee or Consultant" shall mean the 
absence of any  interruption  or  termination  of service as an Employee or  
Consultant. Continuous  Status  as  an  Employee  or  Consultant  shall  not be
considered interrupted  in the case of sick leave,  military  leave,  or any 
other leave of absence  approved by the  Company or any Parent or Subsidiary of 
the  Company; provided  that  such  leave  is for a  period  of  not  more than 
90  days  or reemployment  upon the  expiration  of such leave is  guaranteed by
contract or statute.



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        (i)  "Employee" shall mean any person, including officers and directors,
employed by the Company or any Parent or Subsidiary of the Company.  The payment
of a  director's  fee by the  Company  shall  not be  sufficient  to  constitute
"employment" by the Company.

        (j) "Exchange Act" means the Securities Exchange Act of 1934, as 
amended.

        (k) "Fair Market  Value" means,  as of any date,  the value of Common 
Stock determined as follows:

               (i) If the Common Stock is listed on any established stock 
exchange or a national market system including without limitation the National 
Market System of the National Association of Securities Dealers, Inc. Automated 
Quotation ("NASDAQ") System, its Fair Market Value shall be the closing sales 
price for such stock (or the closing bid, if no sales were reported, as quoted 
on such system or exchange for the last market trading day prior to the time of 
determination) as reported in the Wall Street Journal or such other source as
the Administrator deems reliable;

               (ii) If the  Common  Stock is quoted on the NASDAQ  System  
(but not on the National Market System thereof) or regularly  quoted by a 
recognized  securities dealer but selling  prices are not reported,  its Fair
Market Value shall be the mean between the high and low asked prices for the 
Common Stock or;

               (iii) In the absence of an  established  market for the Common  
Stock,  the Fair  Market  Value   thereof   shall  be   determined  in  good  
faith  by  the Administrator.

        (l) "Incentive Stock Option" shall mean an Option intended to qualify 
as an incentive stock option within the meaning of Section 422 of the Code.

        (m)  "Nonstatutory  Stock  Option"  shall  mean an Option not  intended 
 to qualify as an Incentive Stock Option.

        (n) "Option" shall mean a stock option granted pursuant to the Plan.

        (o) "Optioned Stock" shall mean the Common Stock subject to an Option.

        (p) "Optionee" shall mean an Employee or Consultant who receives an 
Option.

        (q) "Parent"  shall mean a "parent  corporation",  whether now or 
hereafter existing, as defined in Section 424(e) of the Code.

        (r) "Plan" shall mean this 1993 Stock Option Plan.

        (s)  "Share"  shall  mean a share  of the  Common  Stock,  as  adjusted 
in accordance with Section 11 of the Plan.


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        (t)  "Subsidiary"  shall mean a  "subsidiary  corporation", whether now 
or hereafter existing, as defined in Section 424(f) of the Code.

     3.  Stock Subject to the Plan.  Subject to the  provisions of Section 11 of
the Plan, the maximum  aggregate number of shares which may be optioned and sold
under  the  Plan  is  3,800,000  shares  of  Common  Stock.  The  Shares  may be
authorized, but unissued, or reacquired Common Stock.

     If an Option should expire or become  unexercisable  for any reason without
having been exercised in full, the unpurchased Shares which were subject thereto
shall,  unless the Plan shall have been terminated,  become available for future
grant under the Plan.  Notwithstanding  any other provision of the Plan,  shares
issued  under the Plan and later  repurchased  by the  Company  shall not become
available for future grant or sale under the Plan.

     4. Administration of the Plan.

        (a) Procedure.

               (i)  Multiple  Administrative  Bodies.  The  Plan  may be  
administered  by different   Committees  with  respect  to  different  groups 
of  Employees  and Consultants.

               (ii) Section 162(m). To the extent that the Administrator  
determines it to be  desirable  to  qualify  Options  granted  hereunder  as  
"performance-based compensation"  within the meaning of Section  162(m) of the 
Code, the Plan shall be  administered  by a Committee of two or more "outside  
directors"  within the meaning of Section 162(m) of the Code.

               (iii) Rule 16b-3. To the extent desirable to qualify transactions
hereunder as exempt under Rule 16b-3,  the  transactions contemplated hereunder 
shall be structured to satisfy the requirements for exemption under Rule 16b-3.

        (b) Powers of the Administrator. Subject to the provisions of the Plan 
and in the case of a Committee,  the specific duties  delegated by the Board to
such committee, the Administrator shall have the authority, in its discretion:

               (i) to determine the Fair Market Value of the Common  Stock,  in 
accordance with Section 2(k) of the Plan;

               (ii) to select the officers,  Consultants and Employees to whom 
Options may from time to time be granted hereunder;

               (iii)  to  determine  whether  and  to  what  extent  Options  
are  granted hereunder;

               (iv) to  determine  the  number of shares of Common  Stock to be 
covered by each such award granted hereunder;



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               (v) to approve forms of agreement for use under the Plan;

               (vi) to determine the terms and conditions, not inconsistent with
the terms of the Plan, of any award granted hereunder (including,  but not
limited to, the share price and any  restriction or limitation,  or any vesting 
acceleration or waiver of  forfeiture  restrictions  regarding  any Option  and/
or the shares of Common  Stock  relating  thereto,  based  in each case on such 
factors  as the Administrator shall determine, in its sole discretion);

               (vii) to determine  whether and under what  circumstances  an 
Option may be settled in cash under subsection 9(e) instead of Common Stock;

               (viii) to determine  whether,  to what extent and under what 
circumstances Common Stock and other amounts  payable with respect to an award 
under this Plan shall be deferred  either  automatically  or at the election of 
the  participant (including  providing  for and  determining  the  amount,  if 
any, of any deemed earnings on any deferred amount during any deferral period);

               (ix) to reduce the  exercise  price of any Option to the then  
current Fair Market Value if the Fair Market Value of the Common Stock covered
by such Option shall have declined since the date the Option was granted; and

        (c)  Effect of Administrator's Decision. All decisions, determinations 
and interpretations of the Administrator shall be final and binding on all 
Optionees and any other holders of any Options.

        (d)  Grant  Limits. The following limitations  shall  apply to grants of
Options under the Plan:

               (i) No  employee  shall be  granted,  in any fiscal  year of the 
Company, Options under the Plan to purchase more than 150,000  Shares,  provided
that the Company  may make an  additional  one-time  grant  of up to  250,000 
Shares  to newly-hired Employees.

               (ii)  The  foregoing  limitations  shall  be  adjusted  
proportionately  in connection  with any change in the  Company's capitalization
as  described  in Section 11.

               (iii)  If  an  Option  is  cancelled  (other than  in connection 
with  a transaction  described in  Section 11),  the  cancelled  Option shall be
counted against  the  limits  set forth in  Section 4(d)(i).  For this purpose, 
if the exercise  price of an Option is reduced,  the  transaction  will be
treated as a cancellation of the Option and the grant of a new Option.

     5. Eligibility.

        (a) Nonstatutory Stock Options may be granted only to Employees,
Directors, and  Consultants.  Incentive Stock Options may be granted only to 
Employees.  An Employee, Director, or



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Consultant who has been granted an Option may, if he is otherwise eligible,
be granted an additional Option or Options.

        (b) Each Option  shall be designated in the written  option agreement as
either an  Incentive  Stock  Option or a  Nonstatutory  Stock  Option.  However,
notwithstanding such designations,  to the extent that the aggregate Fair Market
Value of the Shares with respect to which Options  designated as Incentive Stock
Options are  exercisable  for the first time by any Optionee during any calendar
year  (under  all plans of the  Company  or any  Parent or  Subsidiary)  exceeds
$100,000, such excess Options shall be treated as Nonstatutory Stock Options.

        (c) For purposes of Section 5(b), Incentive Stock Options shall be taken
into account in the order in which they were granted,  and the Fair Market Value
of the Shares shall be determined as of the time the Option with respect to such
Shares is granted.

        (d) The Plan shall not confer upon any Optionee any right with respect 
to continuation  of  employment or consulting  relationship  with the Company,  
nor shall it interfere in any way with his right or the Company's right to 
terminate his employment or consulting relationship at any time, with or without
cause.

     6. Term of Plan.  The Plan shall become effective upon the earlier to occur
of its adoption by the Board of Directors or its approval by the shareholders of
the Company as described in Section 18 of the Plan. It shall  continue in effect
for a term of ten (10) years unless  sooner  terminated  under Section 14 of the
Plan.

     7. Term of Option. The term of each Option shall be ten (10) years from the
date of grant  thereof or such  shorter  term as may be  provided  in the Option
Agreement.  However,  in the case of an  Incentive  Stock  Option  granted to an
Optionee who, at the time the Option is granted,  owns stock  representing  more
than ten  percent  (10%) of the  voting  power  of all  classes  of stock of the
Company or any Parent or  Subsidiary,  the term of the Option  shall be five (5)
years from the date of grant  thereof or such shorter term as may be provided in
the Option Agreement.

     8. Exercise Price and Consideration.

        (a) The per Share exercise price for the Shares to be issued pursuant to
exercise of an Option  shall be such price as is  determined  by the Board,  but
shall be subject to the following:

               (i) In the case of an Incentive Stock Option

                    (A) granted to an Employee who, at the time of the grant of 
such   Incentive Stock Option,  owns stock representing more than ten percent 
(10%) of  the voting power of all  classes of stock of the Company or any Parent
or   Subsidiary, the per Share exercise price shall be no less than 110% of the 
Fair Market Value per Share on the date of grant.


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                    (B) granted to any Employee,  the per Share exercise price 
shall be no less than 100% of the Fair Market Value per Share on the date of 
grant.

               (ii) In the case of a  Nonstatutory Stock Option,  the per Share 
exercise price shall be determined by the  Administrator.  In the case of a  
Nonstatutory Stock Option intended to qualify as "performance-based  
compensation" within the meaning of Section  162(m) of the Code, the per Share 
exercise price shall be no less than 100% of the Fair Market Value per Share on 
the date of grant.

               (iii)  Notwithstanding  the  foregoing,  Options may be granted  
with a per Share exercise price of less than 100% of the Fair Market Value per 
Share on the date of grant pursuant to a merger or other corporate transaction.

        (b) The  consideration to be paid for the Shares to be issued upon 
exercise of an  Option,  including  the method of  payment, shall be determined 
by the Administrator  and may consist entirely of (1) cash,  (2) check,  
(3) promissory note, (4) other Shares which (x) either have been owned by the
Optionee for more than six  months on the date of  surrender  or were not  
acquired,  directly  or indirectly,  from the  Company,  and (y) have a Fair 
Market Value on the date of surrender  equal to the aggregate exercise price of 
the Shares as to which said Option shall be exercised, (5) authorization from 
the Company to retain from the total number of Shares as to which the Option is 
exercised that number of Shares having a Fair Market Value on the date of 
exercise  equal to the exercise  price for the total number of Shares as to 
which the Option is exercised, (6) delivery of a properly executed exercise 
notice together with irrevocable instructions to a broker to promptly  deliver 
to the Company the amount of sale or loan proceeds required to pay the exercise 
price,  (7) delivery of an irrevocable subscription agreement for the Shares 
which  irrevocably  obligates the option holder to take and pay for the Shares 
not more than twelve months after the date of delivery of the  subscription  
agreement,  (8) any  combination of the foregoing  methods of payment,  (9) or 
such other consideration and method of payment for the issuance of  Shares  to 
the  extent  permitted  under  Applicable  Laws.  In  making  its determination
as to the  type of  consideration  to  accept,  the  Board  shall consider if  
acceptance  of such  consideration  may be  reasonably  expected to benefit the 
Company.

     9. Exercise of Option.

        (a)  Procedure for Exercise;  Rights as a  Shareholder.  Any Option 
granted hereunder  shall be  exercisable  at such  times and under  such  
conditions  as determined  by the Board,  including  performance  criteria  
with respect to the Company and/or the Optionee,  and as shall be permissible 
under the terms of the Plan.

     An Option may not be exercised for a fraction of a Share.

     An Option  shall be  deemed to be  exercised  when  written  notice of such
exercise  has been  given to the  Company  in  accordance  with the terms of the
Option by the person  entitled to exercise  the Option and full  payment for the
Shares with  respect to which the Option is exercised  has been  received by the
Company. Full payment may, as authorized by the Board, consist of any



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consideration  and method of payment  allowable  under  Section 8(b) of the
Plan. Until the issuance (as evidenced by the appropriate  entry on the books of
the Company or of a duly authorized  transfer agent of the Company) of the stock
certificate evidencing such Shares, no right to vote or receive dividends or any
other rights as a  shareholder  shall exist with respect to the Optioned  Stock,
notwithstanding the exercise of the Option. The Company shall issue (or cause to
be issued)  such stock  certificate  promptly  upon  exercise of the Option.  No
adjustment  will be made for a dividend or other right for which the record date
is prior to the date the stock  certificate  is issued,  except as  provided  in
Section 11 of the Plan.

     Exercise  of an Option in any  manner  shall  result in a  decrease  in the
number of Shares which  thereafter  may be  available,  both for purposes of the
Plan and for sale  under  the  Option,  by the  number of Shares as to which the
Option is exercised.

        (b)  Termination of Status  as an  Employee or Consultant. In the event 
of termination of an Optionee's  Continuous Status as an Employee or Consultant 
(as the case may be),  such  Optionee may, but only within thirty (30) days (or 
such other period of time, not exceeding three (3) months in the case of an
Incentive Stock Option or six (6) months in the case of a Nonstatutory Stock 
Option, as is determined  by the Board)  after the date of such  termination  
(but in no event later than the date of expiration of the term of such Option as
set forth in the Option  Agreement), exercise  his Option to the extent that he 
was  entitled to exercise  it at the  date of such  termination. To the  extent 
that he was not entitled to exercise the Option at the date of such termination,
or if he does not exercise  such Option  (which he was  entitled to exercise)  
within the time specified herein, the Option shall terminate.

        (c) Disability of Optionee. Notwithstanding the provisions of Section 9
(b) above,  in the event of  termination  of an Optionee's  Continuous  Status 
as an Employee or  Consultant as a result of his total and permanent disability 
(as defined in Section 22(e)(3) of the Code), he may, but only within six (6) 
months (or such other period of time not exceeding  twelve (12) months as is 
determined by the Board) from the date of such  termination (but in no event 
later than the date of  expiration  of the  term of such  Option  as set forth  
in the  Option Agreement), exercise his Option to the extent he was entitled to 
exercise it at the date of such termination. To the extent that he was not 
entitled to exercise the Option at the date of  termination,  or if he does not 
exercise  such Option (which he was entitled to exercise) within the time 
specified herein, the Option shall terminate.

        (d) Death of Optionee. In the event of the death of an Optionee:

               (i)  during  the  term of the  Option  who is at the time of his 
death an Employee or  Consultant  of the  Company  and who shall have been in  
Continuous Status as an Employee or Consultant  since the date of grant of the 
Option,  the Option may be  exercised,  at any time within  twelve (12) months  
following the date of death (but in no event later than the date of  expiration 
of the term of such Option as set forth in the Option  Agreement),  by the 
Optionee's estate or by a person  who  acquired  the  right to  exercise  the  
Option by  bequest  or inheritance,  but only to the  extent of the right to  
exercise  that would have accrued had the Optionee  continued living and 
remained in Continuous  Status as an Employee or Consultant twelve (12) months 
after the date of death, subject to the limitation set forth in Section 5(b); or


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               (ii) within  thirty (30) days (or such other  period of time not 
exceeding three (3)  months as is  determined  by the  Board)  after  the  
termination  of Continuous Status as an Employee or Consultant,  the Option may 
be exercised, at any time within twelve (12) months following the date of death 
(but in no event later than the date of expiration of the term of such Option as
set forth in the Option  Agreement),  by the  Optionee's  estate or by a person 
who  acquired the right to exercise the Option by bequest or  inheritance,  but 
only to the extent of the right to exercise that had accrued at the date of 
termination.

        (e) Buyout Provisions. The Administrator may at any time offer to buy 
out for a payment in cash or Shares,  an Option  previously  granted,  based on 
such terms and conditions as the Administrator shall establish and communicate 
to the Optionee at the time that such offer is made.

     10.  Non-Transferability of Options.  Options  may  not be  sold,  pledged,
assigned,  hypothecated,  transferred or disposed of in any manner other than by
will or by the laws of descent  and  distribution  or  pursuant  to a  qualified
domestic  relations  order as  defined  by the  Code or Title I of the  Employee
Retirement  Income Security Act, or the rules  thereunder.  The designation of a
beneficiary  by an Optionee  does not  constitute  a transfer.  An Option may be
exercised,  during the  lifetime  of the  Optionee,  only by the  Optionee  or a
transferee permitted by this Section 10.

     11.  Adjustments Upon Changes in Capitalization  or Merger.  Subject to any
required  action by the  shareholders  of the  Company,  the number of shares of
Common Stock  covered by each  outstanding  Option,  and the number of shares of
Common Stock which have been  authorized  for issuance  under the Plan but as to
which no Options have yet been  granted or which have been  returned to the Plan
upon  cancellation or expiration of an Option, as well as the price per share of
Common Stock covered by each such outstanding  Option,  shall be proportionately
adjusted for any  increase or decrease in the number of issued  shares of Common
Stock  resulting  from a stock  split,  reverse  stock  split,  stock  dividend,
combination or  reclassification  of the Common Stock,  or any other increase or
decrease in the number of issued shares of Common Stock effected without receipt
of  consideration  by the Company;  provided,  however,  that  conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of  consideration."  Such adjustment shall be made by the Board,
whose  determination  in that respect  shall be final,  binding and  conclusive.
Except as  expressly  provided  herein,  no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an Option.

     In the event of the proposed dissolution or liquidation of the Company, the
Board  shall  notify  the  Optionee  at least  fifteen  (15) days  prior to such
proposed action. To the extent it has not been previously exercised,  the Option
will terminate immediately prior to the consummation of such proposed action. In
the event of a merger  of the  Company  with or into  another  corporation,  the
Option shall be assumed or an  equivalent  option shall be  substituted  by such
successor  corporation or a parent or subsidiary of such successor  corporation.
In the even the successor corporation does not agree to assume the option or the
substitute and equivalent option, the Board shall, in lieu of such assumption or
substitution, provide for the Optionee to have the right to vest in and exercise
the Option as to all of the


  

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Optioned Stock, including Shares as to which the Option would not otherwise
be vested  or  exercisable.  If the  Board  makes an  Option  fully  vested  and
exercisable in lieu of assumption or substitution in the event of a merger,  the
Board  shall  notify  the  Optionee  that the Option  shall be fully  vested and
exercisable for a period of fifteen (15) days from the date of such notice,  and
the Option will  terminate  upon the  expiration  of such period.  If, in such a
merger,  the Option is assumed or an equivalent  option is  substituted  by such
successor  corporation or a parent or subsidiary of such successor  corporation,
and if during a one-year  period after the  effective  date of such merger,  the
Optionee's  Continuous Status as an Employee or Consultant is terminated for any
reason other than the Optionee's  voluntary  termination  of such  relationship,
then the Optionee shall have the right within thirty days thereafter to exercise
the Option as to all of the  Optioned  Stock,  including  Shares as to which the
Option  would not be  otherwise  exercisable,  effective  as of the date of such
termination.

     12.  Stock  Withholding  to Satisfy  Withholding  Tax  Obligations.  At the
discretion of the Administrator,  Optionees may satisfy withholding  obligations
as  provided  in this  paragraph.  When an  Optionee  incurs  tax  liability  in
connection  with an Option,  which tax  liability is subject to tax  withholding
under  applicable  tax laws, and the Optionee is obligated to pay the Company an
amount  required to be withheld  under  applicable  tax laws,  the  Optionee may
satisfy the withholding tax obligation by electing to have the Company  withhold
from the Shares to be issued upon exercise of the Option, if any, that number of
Shares  having a Fair Market Value equal to the amount  required to be withheld.
The Fair Market Value of the Shares to be withheld  shall be  determined  on the
date that the amount of tax to be withheld is to be determined.

     13. Time of Granting Options. The date of grant of an Option shall, for all
purposes,  be the date on which the Board makes the determination  granting such
Option.  Notice  of the  determination  shall  be  given  to  each  Employee  or
Consultant  to whom an Option is so granted  within a reasonable  time after the
date of such grant.

     14. Amendment and Termination of the Plan.

        (a)  Amendment  and  Termination.  The Board may at any time amend,  
alter, suspend or  discontinue  the Plan, but no amendment,  alteration,  
suspension or discontinuation  shall be made which  would  impair the rights of 
any  Optionee under any grant theretofore made,  without his or her consent.  
In addition,  to the extent  necessary  and  desirable to comply with Section 
422 of the Code (or any other  applicable law or regulation,  including the 
requirements of the NASD or an established stock exchange), the Company shall 
obtain shareholder approval of any Plan amendment in such a manner and to such a
degree as required.

        (b)  Effect of Amendment or Termination.  Any such amendment or 
termination of the Plan shall not affect  Options  already  granted and such  
Options  shall remain  in full  force  and  effect  as if this  Plan  had not 
been  amended  or terminated, unless mutually agreed otherwise between the 
Optionee and the Board, which agreement must be in writing and signed by the 
Optionee and the Company.



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     15. Conditions Upon Issuance of Shares. Shares shall not be issued pursuant
to the exercise of an Option unless the exercise of such Option and the issuance
and  delivery of such Shares  pursuant  thereto  shall  comply with all relevant
provisions of law, including, without limitation, the Securities Act of 1933, as
amended, the Exchange Act, the rules and regulations promulgated thereunder, and
the requirements of any stock exchange upon which the Shares may then be listed,
and shall be further  subject to the  approval of counsel  for the Company  with
respect to such compliance.

     As a condition  to the  exercise of an Option,  the Company may require the
person  exercising  such Option to represent and warrant at the time of any such
exercise that the Shares are being purchased only for investment and without any
present  intention  to sell or  distribute  such  Shares  if, in the  opinion of
counsel  for  the  Company,  such a  representation  is  required  by any of the
aforementioned relevant provisions of law.

     16. Reservation of Shares.  The Company, during the term of this Plan, will
at all  times  reserve  and keep  available  such  number  of Shares as shall be
sufficient to satisfy the requirements of the Plan.

     The inability of the Company to obtain  authority from any regulatory  body
having  jurisdiction,  which authority is deemed by the Company's  counsel to be
necessary to the lawful issuance and sale of any Shares hereunder, shall relieve
the  Company of any  liability  in respect of the  failure to issue or sell such
Shares as to which such requisite authority shall not have been obtained.

     17.  Option  Agreement.  Options  shall  be  evidenced  by  written  option
agreements in such form as the Board shall approve.

     18.  Shareholder  Approval.  Continuance  of the Plan  shall be  subject to
approval by the  shareholders of the Company within twelve (12) months before or
after the date the Plan is adopted.  Such shareholder approval shall be obtained
in the degree and manner required under Applicable Laws.



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