UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

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

                           TRIMBLE NAVIGATION LIMITED
         ---------------------------------------------------------------
                                (Name of Issuer)

                                  COMMON STOCK
        ----------------------------------------------------------------
                         (Title of Class of Securities)

                                   896239 10 0
         ---------------------------------------------------------------
                                 (CUSIP Number)



     Check the following box if a fee is being paid with this statement /_/ . (A
fee is not required only if the filing 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).

     *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 the disclosures provided in a prior cover page.

     The  information  required in 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").




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<PAGE>




 
CUSIP No.:  896239 10 0                                  13G
 


 1       NAME OF REPORTING PERSON
         S.S. or I.R.S. Identification No. of Above Person

                            Charles Robert Trimble
                            SSN 558-60-0206

2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                     (a) / /
                                     (b) / /
 

3        SEC USE ONLY


4        CITIZENSHIP OR PLACE OF ORGANIZATION                 USA

 

NUMBER OF                    5        SOLE VOTING POWER                1,568,819
 SHARES
BENEFICIALLY                 6        SHARED VOTING POWER                     --
 OWNED BY
  EACH                       7        SOLE DISPOSITIVE POWER           1,568,819
REPORTING
 PERSON                      8        SHARED DISPOSITIVE POWER                --
  WITH


9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                    1,568,819  SHARES

10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
           SHARES*

                           Not Applicable

11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                           6.88%

12       TYPE OF REPORTING PERSON*

                 IN
 


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<PAGE>
 
 


CUSIP number    896239 10 0                          13G

ITEM 1.

Issuer:           TRIMBLE NAVIGATION LIMITED
                  645 N. Mary Avenue
                  Sunnyvale, CA.  94086

ITEM 2.

(a)      Name of Person Filing                            Charles Robert Trimble
(b)      Address of Principal Business Office 
         or, if none,  residence                          645 N. Mary Avenue
                                                          Sunnyvale, CA.  94086
(c)      Citizenship                                      U.S.A.
(d)      Title of Class of Securities                     Common
(e)      CUSIP number                                     896239 10 0

ITEM 3.

                                                         Not Applicable

ITEM 4.  OWNERSHIP


(a)      Amount beneficially owned                            1,568,819shares  *
(b)      Percent of  Class                                             6.88%
(c)      Number of shares as to which such person has:
         (I)   sole power to vote or to direct the vote                1,568,819
         (ii)  shared power to vote or to direct the vote                     --
         (iii) sole power to dispose or to direct the disposition of   1,568,819
         (iv) shared power to dispose or to direct the disposition of         --

ITEM 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

         Not applicable

ITEM 6.  OWNERSHIP OF MORE THAN FIVE PERCENT OR LESS OF A CLASS.

         Not applicable

ITEM 7.    IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
           ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY

           Not applicable

ITEM 8.    IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

          Not applicable



*   10,000        Shares held by Charles R. Trimble
 1,552,341        Shares held by Trimble Family Partners of which Mr. Trimble 
                  is the sole general partner
    6,478         Shares held by Mr. Trimble's self-directed 401(k) account



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<PAGE>


CUSIP number    896239 10 0                          13G




ITEM 9.    NOTICE OF DISSOLUTION OF A GROUP

           Not applicable

ITEM 10.   CERTIFICATION

           Not applicable




                                    SIGNATURE

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



                                    February 13, 1998




                                    /s/ Charles R. Trimble    
                                        Charles R. Trimble