Unlocking the GPSResetting the password on a Garmin StreetPilot c550 requires the GPS to be unlocked. This may be accomplished by entering the PIN after turning the unit on or moving to the security location set when the security features were activated. If you forgot the PIN and the security location is no longer accessible, Garmin customer support will unlock the unit with a copy of the sales receipt for a fee (this service is not covered by warranty).Resetting the PasswordAfter unlocking the StreetPilot c550, touch the settings icon (a wrench) on the ribbon menu at the bottom of the main page.