Garmin 521 Manuel D’Utilisation

Configuring the Chartplotter

aiS alarm—create a safe zone around your boat for collision 

avoidance. The zone can be customized.

  From the Home screen, select 

 > 

> 

.

Range—change the measured radius of the safe-zone ring to 

a specified distance from 500 ft. to 2.0 nm (or from 150 m to 

3.0 km, or from 500 ft. to 2.0 mi).
Time to (Safe Zone)—sounds an alarm if AIS or MARPA 

determines that a target will intersect the safe zone within the 

defined time interval (from 1 to 24 minutes).
AIS Alarm—when On is selected, a message is displayed 

(“AIS: Dangerous Target”) when a vessel enters the safe 

zone. When 

Off is selected, the message will not be 

displayed.