
4 GPSMAP 400/500 Series Owner’s Manual
Getting Started
—select the minimum safe depth for your
boat. Refer to your boat specications for more information.
—only available if you are receiving NMEA
sonar depth data. Select or .
—select the minimum overhead
clearance for your boat. Refer to your boat specications for more
information.
(is not available if you select for
)—select the distance within which an alarm will sound if
an AIS vessel nears your boat (page 49).
(is not available if you select for
)—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
calibrate it now. Select or .
Adjusting the Backlight
1. Press and release the Power key.
2. Select Backlight.
3. Press left or right on the Rocker to manually adjust the backlight.
Press the 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 (automatic backlight is
available only on the GPSMAP 535, 536, 545, and 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.
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