Hold to open the power menu.

Power Off

Turns off the device.

Backlight

Adjusts the brightness of the screen.

Mark Waypoint

Saves your current location as a waypoint.

Expedition

Turns on expedition mode (Turning On Expedition Mode).

Lock Buttons

Locks the device buttons to prevent inadvertent button presses (Locking and Unlocking the Buttons).

Lock Device

Locks the device to prevent unauthorized use if you have set up a passcode (Setting Your Device Passcode).