Touchscreen calibration for Nüvi 1xxx/2xxx/3xxx series devices (Nüvi 1250; Nüvi 1350; Nüvi 1350T; Nüvi 1390T; Nüvi 1490T, Nüvi 2350, etc.):
1. Make sure the device is switched off.
2. Press and hold your finger in the upper left corner of the touchscreen.
3. Switch the device on while still holding your finger on the screen.
4. Keep holding your finger on the screen for 30-45 seconds until the screen calibration menu appears.
5. Tap the points on the screen as accurately as possible.
