The GPS 90 may be powered by four AA b a t t e r i e s ,
wired directly to 8-40 volt DC power, or by an optional
c i g a rette lighter plug adapter. The internal AA batteries
provide up to 15 hours of operation in normal mode and
up to 20 hours of operation in battery saver mode on 4
AA alkaline batteries. Rechargeable Ni-Cad or lithium bat-
teries may also be used. Note that the battery level indica-
tor is calibrated for alkaline batteries, and Ni-Cad and
lithium batteries will only show battery life at part i a l
scale. No other functions will be affected.
To install batteries:
1. Remove the battery cover by turning the thumb loop 1/4
turn counter-clockwise.
2. Insert batteries into position. The battery pole you can
still see should match the symbol marked on the case
3. Replace the battery cover by turning the thumb loop 1/4
turn clockwise.
Never store your GPS 90 without batteries. A built-in
rechargeable lithium battery will save almanac and way-
point data while you are changing the batteries, but will
only save data for a few months. If you’re storing the unit
for the season, put in a fresh set of alkaline batteries to
help prevent loss of stored data.
66
Appendix C
Batteries
& Electrical
Wiring
Battery Installation
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