II Morrow Inc. 920 GPS - Manual (Page 46)

Time information is lost in about 10 minutes if
power is removed from the receiver. Replace
weak batteries promptly or connect the
receiver to external power to avoid losing and
having to re-enter this information.
Screen and Beeper
This option controls operation of the built-in
beeper and display backlight, and allows you
to adjust display contrast.
The beeper setting controls when the beeper
sounds: MSG -beeps for messages, KEY -
beeps each time you press a key, MSG &
KEY - beeps for both, and OFF - beeper does
not sound.
Use the backlight to view the display in low
light or darkness. You can select low or high
intensity backlight settings from this screen.
(You may also change the backlight setting by
pressing the MENU/PWR key several times.
See page B-2.)
Change
Settings
D
5