GPS City will show you how to RESET your Garmin Edge 800 GPS back to factory default settings. Back up all wanted GPS data as a precaution before starting.
Press the top left hand corner of the screen. Turn the unit on while maintaining pressure in the top left corner. When you see a prompt asking, "Reset device settings back to factory defaults?", you can release your finger and select yes.
Problems that may be solved by resetting the GPS;
-My GPS will not track satellites!
-Forgot what settings were changed and need to restart.
-My compass will not work or calibrate.
-My barometric altimeter will not work or calibrate.
-Edge won't connect to my heart rate monitor.
-Edge won't connect to my cadence sensor.
...
Also it is best to perform a firmware update using Garmin WebUpdater. This too sometimes fixes problems you see with your GPS.
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