Certification of CEO and CFO Pursuant to
                             18 U.S.C. Section 1350,
                             as Adopted Pursuant to
                  Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report on Form 10-Q of Trimble Navigation
Limited (the "Company") for the quarterly period ended September 27, 2002 as
filed with the Securities and Exchange Commission on the date hereof (the
"Report"), Steven W. Berglund, as Chief Executive Officer of the Company, and
Mary Ellen Genovese, as Chief Financial Officer of the Company, each hereby
certifies, pursuant to 18 U.S.C. ss. 1350, as adopted pursuant to ss. 906 of the
Sarbanes-Oxley Act of 2002, that, to the best of his or her knowledge:

          (1) The Report fully complies with the  requirements  of Section 13(a)
     or 15(d) of the Securities Exchange Act of 1934; and

          (2) The information  contained in the Report fairly  presents,  in all
     material respects, the financial condition and results of operations of the
     Company.

/s/Steven W. Berglund
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Name: Steven W. Berglund
Title:  Chief Executive Officer
Date:   November 7, 2002

/s/ Mary Ellen Genovese
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Name: Mary Ellen Genovese
Title:  Chief Financial Officer
Date:   November 7, 2002

This certification accompanies the Report pursuant to ss. 906 of the
Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the
Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of ss.18
of the Securities Exchange Act of 1934, as amended.