Garmin 190-00683-00 Manuale Utente

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. 

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.

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