Exhibit 31.2

                        Certification of CFO Pursuant to
                 Securities Exchange Act Rules 13a-14 and 15d-14
                             as Adopted Pursuant to
                  Section 302 of the Sarbanes-Oxley Act of 2002

I, Mary Ellen  Genovese,  the Chief  Financial  Officer  of  Trimble  Navigation
Limited, certify that:

     1.   I have  reviewed  this  report  on  Form  10-Q of  Trimble  Navigation
          Limited;

     2.   Based on my  knowledge,  this  report  does  not  contain  any  untrue
          statement  of a  material  fact  or  omit to  state  a  material  fact
          necessary to make the statements  made, in light of the  circumstances
          under which such  statements were made, not misleading with respect to
          the period covered by this quarterly report;

     3.   Based on my knowledge,  the financial statements,  and other financial
          information  included in this quarterly report,  fairly present in all
          material respects the financial  condition,  results of operations and
          cash flows of the registrant as of, and for, the periods  presented in
          this report;

     4.   The registrant's  other  certifying  officer and I are responsible for
          establishing  and maintaining  disclosure  controls and procedures (as
          defined in Exchange Act Rules 13a-15e and 15d-15e) for the  registrant
          and have:


         (a)      Designed such disclosure  controls and  procedures,  or caused
                  such  disclosure  controls and procedures to be designed under
                  our supervision,  to ensure that material information relating
                  to the registrant, including its consolidated subsidiaries, is
                  made known to us by others within those entities, particularly
                  during the period in which this report is being prepared;

         (b)      Evaluated the  effectiveness  of the  registrant's  disclosure
                  controls  and  procedures  and  presented  in this  report our
                  conclusions about the effectiveness of the disclosure controls
                  and  procedures,  as of the end of the period  covered by this
                  report based on such evaluation; and

         (c)      Disclosed  in  this  report  any  change  in the  registrant's
                  internal control over financial reporting that occurred during
                  the   registrant's   most  recent  fiscal   quarter  that  has
                  materially  affected  or is  reasonably  likely to  materially
                  affect,  the  registrant's  internal  control  over  financial
                  reporting; and


     5.       The registrant's  other  certifying  officer and I have disclosed,
              based on our most  recent  evaluation  of  internal  control  over
              financial reporting, to the registrant's auditors and to the audit
              committee  of   registrant's   board  of  directors   (or  persons
              performing the equivalent function):

         (a)      All significant  deficiencies  and material  weaknesses in the
                  design  or  operation  of  internal   control  over  financial
                  reporting which are reasonably  likely to adversely affect the
                  registrant's ability to record, process,  summarize and report
                  financial information; and

         (b)      Any fraud,  whether or not material,  that involves management
                  or  other  employees  who  have  a  significant  role  in  the
                  registrant's internal control over financial reporting.



Dated: August 15, 2003                       /s/ Mary Ellen Genovese
                                              ----------------------
                                                 Mary Ellen Genovese
                                                 Chief Financial Officer