Garmin GPSMAP 496 Owner's Manual (for Europe) - Page 109
System Alarms Sub Tab, Sonar Alarms Sub Tab Marine Mode Only, Clock, Ext. External Voltage, Accuracy
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System Alarms Sub Tab Main Menu > Celestial Tab Sonar Alarms Sub Tab (Marine Mode Only) You must be receiving sonar NMEA data for Sonar alarms to work. System Alarms Sub Tab Clock-sets an alarm based on the unit's clock. Select On, and then enter a specific time that you want the 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 specified amount. 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, and then enter a specific distance. Sonar Alarms Sub Tab Shallow Water and Deep Water-sets an alarm to sound when you enter an area of water that is too shallow or deep. Water Temp-sets an alarm to indicate if the water temperature has exceeded or dropped below a specific temperature, or fallen outside/ inside a specific temperature range. Select Above or Below and then enter a specific temperature, or select Inside or Outside and enter a range of temperatures. Drift-sets an alarm to sound when you have exceeded a specified drift distance. Select On, and then enter a specific distance. Fish-sets alarm to sound when unit detects a fish of the specified symbol size. GPSMAP 496 Owner's Manual 101
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