nuvi 37xx series hard reset:
1. Power off the unit (press/hold the power button for ~7 seconds)
2. Power on the unit
3. When the Garmin copyright screen is displayed, press & hold the bottom-right corner of the screen
4. Release the screen when "Do you really want to erase all user data?" appears
5. Touch "Yes"
Alternate method:
1. With the unit powered on at the map screen, press the bottom-right "Speed" field which will take you to the Trip Computer page
2. Press/hold the area just above the numerical speed on the round speedometer dial (where the compass heading is displayed when moving)
3. After pressing this spot for ~7 seconds, you will enter diagnostics mode
4. Select the first option displayed "Clear all user data", then follow the prompts
You may also want to reflash the firmware and then reset the unit again.



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