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Appendix B
Maintenance of the GPS 165
The GPS 165 is built to exacting standards and does not require user
maintenance. Should the faceplate and lens require cleaning, use a soft cloth and
non-abrasive cleaner. The user data is maintained by an internal battery with a pro-
jected life of 3 to 5 years. If the GPS 165 detects a low memory battery, you will be
informed with the message ‘Memory battery low’. You should return your unit to an
authorized GARMIN service center as soon as possible. Failure to do so may result in
loss of data each time you turn your unit off. This will GREATLY increase satellite
acquisition time and no user data will be saved. This condition will be accompanied
by the message ‘Stored data lost’.
The GPS 165 contains a crystal oscillator, which may drift after many years of
operation. If the unit detects excessive oscillator drift, you will be informed with the
message ‘Osc needs adjustment’. When this occurs, contact an authorized GARMIN
service center for service. Failure to do so may result in severely degraded
acquisition performance.
96
APPENDIX B
GPS 165 Installation/Removal
The GPS 165 may be powered from
an optional AC adapter when used away
from the aircraft, allowing you to use the
GPS 165 at your home or office for flight
planning.
165 manual 7/13/98 4:00 PM Page 96