Adjusting The Backlight - Garmin 400/500 Owner's Manual

Getting Started
Minimum Safe depth—select the minimum safe depth for your
boat. Refer to your boat specifications for more information.
Shallow water alarm—only available if you are receiving NMEA
yes or No.
sonar depth data. Select
Minimum Overhead Clearance—select the minimum overhead
clearance for your boat. Refer to your boat specifications for more
information.
aiS alarm Range (is not available if you select
Receiver)—select the distance within which an alarm will sound if
an AIS vessel nears your boat
aiS alarm Time To (is not available if you select
Receiver)—select the time within which an alarm will sound if an
AIS vessel is on track to intersect the Safe Zone around your boat
(page 49).
If a water speed wheel is detected, a message will ask if you want to
yes or No.
calibrate it now. Select

Adjusting the Backlight

1. Press and release the Power
2. Select Backlight.
3. Press left or right on the Rocker
4
No for aiS
(page 49).
No for aiS
key.
to manually 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
available only on the GPSMAP 535, 536, 545, and 546).
To switch between Day mode and Night mode:
1. Press and release the Power
2. Select Color Mode.
3. Press left or right on the Rocker
(automatic backlight is
key.
to switch between modes.
GPSMAP 400/500 Series Owner's Manual