Page viii
GTN 625/635/650 TSO Installation Manual
Rev. C
190-01004-02
GTN 625/635/650 HARDWARE MOD LEVEL HISTORY
The following table identifies hardware modification (Mod) Levels for the GTN 625, GTN 635, and
GTN 650. Mod Levels are listed with the associated service bulletin number, service bulletin date, and
the purpose of the modification. The table is current at the time of publication of this manual (see date on
front cover) and is subject to change without notice. Authorized Garmin Sales and Service Centers are
encouraged to access the most up-to-date bulletin and advisory information on the Garmin Dealer
Resource web site at www.garmin.com using their Garmin-provided user name and password.
Mod Level
Service Bulletin
Number
Service Bulletin
Date
Purpose of Modification