User Manual Part 1

To power up the Magellan CrossoverGPS 3150 from sleep mode, press
and hold the power button for 2-3 seconds. The Warning screen will
appear. Select OK and you will be taken to the last screen you were
viewing.
5.1.2 Power Management
The Magellan CrossoverGPS 3150 can be configured to automatically go
into “sleep” mode after 20 minutes of no keys or touchscreen being pressed.