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32 GPSMAP
®
500 Series Owner’s Manual
confIGurInG the unIt
Setting Sonar Alarms
To set a sonar alarm, from the Home screen, select Congure >
Alarms > Sonar.
Shallow Water/Deep Water—set an alarm to sound when the depth
islessthanorgreaterthanthespeciedvalue.
Water Temp—set an alarm to sound when the transducer reports
atemperaturethatis2°F(1.1°C)aboveorbelowthespecied
temperature.
Fish—set an alarm to sound when the unit detects a suspended
targetofthespeciedsymbols.
NOTE: You must have a transducer connected. If your unit does
not have a built-in sounder, then you must install a GSD 21 or
GSD 22 sounder module to receive sonar information.
Setting Weather Alarms
To set a weather alarm, from the Home screen, select Congure >
Alarms > Weather Alarms.
NOTE: You must have a subscription to XM WX Weather and
the optional GXM 31 antenna plugged into the XM port on the
back of your unit to view weather information. XM Weather
is available only on GPSMAP 530/535/540/545 units. See the
GXM 31 Owner’s Manual for more information.
My Boat
Toconguresettingsforyourboat,fromtheHomescreen,select
Congure > My Boat.
Auto Guidance—set the Auto Guidance parameters for your boat:
•
Safe Depth—set the minimum depth (referred to the chart
depth datum) to allow when calculating an auto guidance path.
• Safe Height—set the minimum height (referred to the chart
height datum) of a bridge that your boat can safely travel
under.
Keel Offset—offset the surface reading for the depth of a keel. This
makes it possible to measure depth from the bottom of your keel
instead of from the transducer’s location. Enter a positive number to
offset for a keel. You can enter a negative number to compensate for
a large vessel that may draw several feet of water.
To adjust the Keel Offset:
1. From the Home screen, select > My Boat > Keel
Offset.
2. Use the ROCKER to set the value of the keel offset.
3. Press SELECT to accept the number.
NOTE: Press MENU to cancel your changes and return to the
My Boat screen.