Garmin GPSMAP 541s Owner's Manual - Page 10

Adjusting the Backlight, Minimum SaFe depth, Shallow Water Alarm, Minimum OverheaD Clearance

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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 sonar depth data. Select Yes or No. 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 No for AIS Receiver)-select the distance within which an alarm will sound if an AIS vessel nears your boat (page 49). AIS Alarm Time To (is not available if you select No for AIS 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 calibrate it now. Select Yes or No. 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. 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 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. 4 GPSMAP 400/500 Series Owner's Manual

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4
GPSMAP 400/500 Series 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
sonar depth data. Select
yes
or
No
.
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
No
for
AIS
Receiver
)—select the distance within which an alarm will sound if
an AIS vessel nears your boat (
page 49
).
AIS Alarm Time To
(is not available if you select
No
for
AIS
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
calibrate it now. Select
yes
or
No
.
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.
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 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.