Appendix D-Troubleshooting - Garmin GPS 90 Owner's Manual & Reference

Appendix D
Troubleshooting
The GPS 90 features a dry nitrogen-filled case and quality construction to
provide reliable navigation without user maintenance. These design benefits,
coupled with advanced self-test and AutoLocate modes, help the GPS 90
maintain the best possible performance over time. If you're experiencing diffi-
culty using your unit, read the following Q & A section for solutions to com-
mon problems and suggestions for getting the most from your GPS 90.
Why won't my GPS 90 power up?
Make sure a fresh set of AA batteries are correctly installed (see page 66). If
y o u ' re using external power, check the cable connection at the back of the
unit, the DC wiring and the fuse for the circuit you're using. Last but not least,
make sure you're holding the red power key down for two seconds to turn the
unit on. See pages 5, 66 and 67 for more information.
Why does my GPS 90 come on in Searching the Sky mode with an 'All Stored
Data Lost' message?
When a GPS 90 loses all waypoint and satellite data, a 'Searching the Sky'
and 'Stored Data Lost' message will appear on the message page shortly after
the unit is turned on the first time after data loss. There are three ways this can
happen:
• The unit has been stored without batteries
• The POWER and MARK keys have been pressed simultaneously to turn
the unit on
• The GPS has failed internally
If all satellite and waypoint data has been lost, a master reset should be per-
formed to ensure that any possible data corruption is cleared (see page 71).
Once the reset is performed, it may take 7 1/2 to 30 minutes to obtain a posi-
tion fix, as satellite data needs to be collected for each satellite being used. See
the Battery & Antenna Installation sections for more information.
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