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Twilight Adjustment—allows the unit to adjust the backlight for
optimum viewing during twilight times.
Highway Page—indicates whether the Highway Page appears in the
main page sequence.
Compass Page—indicates whether the Compass Page appears in the
main page sequence.
Backlight Intensity—turns the backlight up or down. Press right on
the ROCKER to increase the intensity or left to decrease.
Sound Tab
Use the Sound tab to customize the sounds made by your
GPSMAP 278.
Main Menu—Sound Tab
Beeper—set the beeper to chime during key presses and
alarms (Key and Alarm) or on Alarms Only.
Attention Tone—turn the attention tone on or off that sounds
before the vocal prompts.
Voice Prompt—set the vocal prompt to operate for Guidance
and Status, Route Guidance Only, or No Voice Prompts.
Voice Language—set the language for vocal prompts.
Speaker Volume—set the external speaker volume.
80 GPSMAP 278 Owner’s Manual
MAIn Menu > sound tAb