EXHIBIT
32.1
CERTIFICATION
OF CEO 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 period ended March 31, 2006 as filed with the Securities and Exchange
Commission on the date hereof (the "Report"), Steven
W.
Berglund,
as Chief Executive
Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350,
as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best
of his knowledge, that:
(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
Steven
W.
Berglund
Chief
Executive Officer
May
4,
2006