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System Alarms
Clock—sets an alarm based on the unit’s clock. Select On, and
then enter a specic time that you want the alarm to sound. The
GPSMAP 378/478 must be on for the clock alarm to work.
Ext. (External) Voltage—sets an alarm to sound when the external
voltage drops below a specied amount. Select On, and then enter a
specic voltage.
DGPS—sets an alarm to sound when the GPSMAP 378/478 loses a
differential x.
Accuracy—sets an alarm to sound when GPS accuracy falls outside
of the user-set value. Select On, and then specify a distance.
Weather Alarms
Tornado Warnings—sets an alarm to sound when you enter an area
where a tornado warning is in effect.
Thunderstorm Warnings—sets an alarm to sound when you enter
an area where a severe thunderstorm warning is in effect.
Flood Warnings—sets an alarm to sound when you enter an area
where a ood warning is in effect.
Flash Flood Warnings—sets an alarm to sound when you enter an
area where a ash ood warning is in effect.
Marine Warnings—sets an alarm to sound when you enter an area
where a marine warning is in effect.
GPSMAP 378/478 Owner’s Manual 77
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