Setting The Safe-Zone Collision Alarm; Ais Aids To Navigation - Garmin GPSMAP 7400 Series Owner's Manual

Setting the Safe-Zone Collision Alarm

Before you can set a collision alarm, you must have a compatible chartplotter connected to an AIS device or
radar.
The safe-zone collision alarm is used only with AIS and MARPA. MARPA functionality works with radar. The
safe zone is used for collision avoidance and can be customized.
1 Select Settings > Alarms > Collision Alarm > On.
A message banner appears and an alarm sounds when a MARPA-tagged object or an AIS-activated vessel
enters the safe-zone area around your boat. The object is also labeled as dangerous on the screen. When the
alarm is off, the message banner and audible alarm are disabled, but the object is still labeled as dangerous
on the screen.
2 Select Range, and select a distance for the safe-zone radius around your vessel.
3 Select Time To, and select a time at which the alarm will sound if a target is determined to intersect the safe
zone.
For example, to be notified of a pending intersection 10 minutes before it will likely occur, set Time To to 10,
and the alarm will sound 10 minutes before the vessel intersects the safe zone.
4 Select MARPA Alarm, and select an option for when the alarm sounds for MARPA-tagged objects.

AIS Aids to Navigation

An AIS aid to navigation (ATON) is any kind of navigational aid that is transmitted over the AIS radio. ATONs are
displayed on the charts and have identifying information, such as position and type.
There are three main kinds of AIS ATONs. Real ATONs physically exist and send their identifying and location
information from their actual location. Synthetic ATONs physically exist, and their identifying and location
information is sent from another location. Virtual ATONs do not actually exist, and their identifying and location
information is sent from another location.
You can view AIS ATONs on the chart when the chartplotter is connected to a compatible AIS radio. To show
AIS ATONs, from a chart, select Menu > Layers > Chart > Navaid > ATONs. You can view more information
about an ATON if you select the ATON on the chart.
Charts and 3D Chart Views 29