72Main Menu‘System’ AlarmsClock – sets an alarm based on the unit’s clock. Select ‘On’ and then enter a specific time that you wantthe alarm to sound. The unit must be on for the clock alarm to work.Ext. (External) Voltage – sets an alarm to sound when the external voltage drops below a specifiedamount. Select ‘On’ and then enter a specific voltage.DGPS – sets an alarm to sound when the unit loses a differential fix.Accuracy – sets an alarm to sound when GPS accuracy falls outside of the user-set value. Select ‘On’ andthen enter a specific distance.‘Sonar’ AlarmsShallow Water – sets alarms to sound when you enter an area of water that is too shallow. Select ‘On’and then enter a specific distance. You must be receiving sonar NMEA data for this function to work.Deep Water – sets alarms to sound when you enter an area of water that is too deep. Select ‘On’ andthen enter a specific distance. You must be receiving sonar NMEA data for this function to work.Water Temp – sets an alarm to indicate if the water temperature has exceeded or dropped below a spe-cifi c temperature, or fallen outside/inside a specific temperature range. Select ‘Above’ or ‘Below’ and thenenter a specific temperature, or select ‘Inside’ or ‘Outside’ and enter a range of temperatures. You must bereceiving sonar NMEA data for this function to work.Drift – sets an alarm to sound when you have exceeded a specified drift distance. Select ‘On’ to turn thisalarm on and then enter a distance.Alarms TabAlarms Tab: ‘System’ tabAlarms Tab: ‘Sonar’ tab