Select > Settings > System.

Language

Sets the language displayed on the device.

Time

Sets the time settings (Time Settings).

Backlight Timeout

Sets the length of time before the backlight turns off.

Tones

Turns audible tones on or off. You can set tones for keys and alert messages.

Units

Sets the units of measure used on the device.

GLONASS

Turns GLONASS on or off. By default, the device uses GPS to locate satellites. For increased performance in challenging environments and faster GPS position location, you can enable GPS and GLONASS. Using GPS and GLONASS reduces battery life more quickly than using only GPS.

Software Update

Allows you to check for software updates.

About

Displays the software version and unit ID.