Prøvd å google det? Det første svaret jeg fikk opp var dette:
http://gps4sport.com/blog/?p=81"To hard reset the unit turn the unit off, hold down the mode button and turn the unit on. When the unit asks if you want to erase all user data, select yes. After resetting the unit, leave it with a clear view of the sky for about 30 minutes to acquire the satellite almanac."