System Alarms
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
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 specified amount. Select
On
, and then enter a
specific voltage.
DGPS
—sets an alarm to sound when the GPSMAP 378/478 loses a
differential fix.
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 flood warning is in effect.
Flash Flood Warnings
—sets an alarm to sound when you enter an
area where a flash flood 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
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