Garmin GNC 255 Installation Manual - page 13
190-01182-02
GTR 225/GNC 255 TSO Installation Manual
Rev. B
Page ix
GTR 225/GNC 255 HARDWARE MOD LEVEL HISTORY
The following table identifies hardware modification (Mod) Levels for the GTR 225, GTR 225A, GTR
225B, GNC 255A, and GNC 255B. 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