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GPSMAP 4000 Series Owner’s Manual 3
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Adjusting the Backlight
1. Press and release the POWER key.
2. Select Backlight.
3. To allow the unit to automatically adjust the backlight based on ambient light, select Auto.
To manually adjust the backlight,
either select Up or Down, or use
the ROCKER.
To return to the previous screen,
select Back.
Adjusting the Color Mode
1. Press and release the POWER key.
2. Select Color Mode.
3. Select Day, Night, or Auto.
Day colors are brighter and easier to read in sunlight, night colors are darker and more
subdued. The auto setting switches between day and night colors at sunrise and sunset
(based on almanac data).
Acquiring GPS Satellite Signals
When you turn the unit on, the GPS receiver must collect satellite data and establish its current
location.
When the unit acquires satellite signals, the signal strength bars at the top of the Home screen
are green . When the unit loses satellite signals, the green bars disappear and a ashing
question mark is displayed on the boat icon (on the chart screen).
For more information about GPS, visit the Garmin Web site at www.garmin.com/aboutGPS.
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