4 GPSMAP 400/500 Series Owner’s Manual
Getting Started
Adjusting the Backlight
1. Press and release the Power key.
2. Press left or right on the Rocker to adjust the backlight.
NOTE: Press the Power key repeatedly to cycle between
maximum backlight, minimum backlight, and your manual setting.
To allow the unit to automatically adjust the backlight based on
ambient light, select Auto Backlight (automatic backlight is
available only on the GPSMAP 536 and GPSMAP 546).
To switch between Day mode and Night mode:
1. Press and release the Power key.
2. Select Color Mode.
3. Press left or right on the Rocker to switch between modes.
To allow the unit to automatically adjust the backlight based on
ambient light, select Auto Day/Night Mode.
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