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.

Symbol

Meaning

ATON

Real or synthetic ATON

ATON

Real or synthetic ATON: Topmark North

ATON

Real or synthetic ATON: Topmark South

ATON

Real or synthetic ATON: Topmark East

ATON

Real or synthetic ATON: Topmark West

ATON

Real or synthetic ATON: Topmark Special

ATON

Real or synthetic ATON: Topmark Safe

ATON

Real or synthetic ATON: Topmark Danger

ATON

Virtual ATON

ATON

Virtual ATON: Topmark North

ATON

Virtual ATON: Topmark South

ATON

Virtual ATON: Topmark East

ATON

Virtual ATON: Topmark West

ATON

Virtual ATON: Topmark Special

ATON

Virtual ATON: Topmark Safe

ATON

Virtual ATON: Topmark Danger

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