38 GPSMAP 4000 Series Owner’s Manual
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Setting Navigation Alarms
To set a navigation alarm, from the Home screen, select Congure > Alarms > Navigation.
Anchor Drag—set an alarm to sound when you exceed a specied drift distance.
Arrival—set an alarm to sound when you are within a specied distance or time from a destination
waypoint.
Off Course—set an alarm to sound when you are off course by a specied distance.
Setting System Alarms
To set a system alarm, from the Home screen, select Congure > Alarms > System.
Clock—set an alarm using the system (GPS) clock. The unit must be on for the clock alarm to work.
Battery
—set an alarm to sound when the battery reaches a user-determined low voltage.
GPS Accuracy—set an alarm to sound when the GPS location accuracy falls outside the user-
determined value.
Setting Sonar Alarms
To set a sonar alarm, from the Home screen, select Congure > Alarms > Sonar.
NOTE: You must have an optional sonar module (and a transducer connected to the sounder
module) wired via NMEA 0183 or connected to the Garmin Marine Network to receive sonar
information.
Shallow Water/Deep Water—set an alarm to sound when the depth is less than or greater than the
specied value.
Water Temp—set an alarm to sound when the transducer reports a temperature that is 2° F (1.1° C)
above or below the specied temperature.
Fish—set an alarm to sound when the unit detects a suspended target of the specied symbols.
Setting Weather Alarms
To set a weather alarm from the Home screen, select Congure > Alarms > Weather.
NOTE: You must have a subscription to XM WX Weather and the optional GDL 30/30A module
connected to the Garmin Marine Network to view weather information. Refer to page 53 for more
information.
Conguring My Boat
To congure settings for your boat - from the Home screen, select Congure > My Boat.
Auto Guidance—set the Auto Guidance parameters for your boat:
Safe Depth—set the minimum depth (refers to the chart depth datum) to allow when
calculating an auto guidance path.
Safe Height—set the minimum height (refers to the chart height datum) of a bridge that your
boat can safely travel under.
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