Let me share with you some of the secret commands in the Garmin GPSmap 276C:
**Self Test
When the unit is turned off, keep the POWER and ENTER/MARK keys pressed until a test page is displayed:
**User Reset
When the unit is turned off, keep the POWER and QUIT keys pressed until this question is displayed:
Garmin GPSmap 276C User Reset page:
Warning! Answering Yes to the question will erase all user supplied data (such as tracklogs, waypoints and routes) and preferences (such as setups), and the whole unit will be set back to factory defaults.
