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Zumo 450/550

1. Turn the device off.
2. Press and hold on/off button, about a minute
3. When the Calibration screen comes up then follow the instructions on the screen.

Nuvi 2xx

1. Turn the nuvi device off.
2. Press the power swith over into the on position and hold for 45 secs.
3. You should see a message on the display that says ‘Press Dot’
4. Keep pressing the dot as it moves around the screen until the calibration is finished.
5. Once this is complete, there will be a message that says “calibration complete”.