Garmin GPSMAP 540 Owner's Manual - Page 52
Setting System Alarms, Change Time/Change Distance, Anchor Drag, Off Course, Clock, Battery - gps receiver
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Configuring the Chartplotter • Change Time/Change Distance-if you have Activation set to Time, select Change Time to set the number of minutes before arrival that the alarm should sound. If you have Activation set to Distance, select Change Distance to set the distance before arrival that the alarm should sound. Use the Rocker to change the time or distance. Anchor Drag-set an alarm to sound when you exceed a specified drift distance. Off Course-set an alarm to sound when you are off course by a specified distance. Setting System Alarms To set a system alarm from the Home screen, select Configure > 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 specified low voltage. GPS Accuracy-set an alarm to sound when the GPS location accuracy falls outside the specified value. Setting Sonar Alarms To set a sonar alarm from the Home screen, select Configure > Alarms > Sonar. Note: You must be receiving NMEA sonar depth data or using a Garmin sounder module to configure sonar alarms. Shallow Water-set an alarm to sound when the depth is less than the specified value. Deep Water-set an alarm to sound when the depth is greater than the specified 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 specified temperature. Fish-set an alarm to sound when the unit detects a suspended target of the specified symbols. -sounds an alarm for all fish sizes. -sounds an alarm for medium and large fish only. -sounds an alarm for large fish only. 46 GPSMAP 400/500 Series Owner's Manual