AIS Distress Signals
Self-contained AIS distress signal devices transmit emergency position reports when activated. The
chartplotter can receive signals from Search and Rescue Transmitters (SART), Emergency Position Indicating
Radio Beacons (EPIRB), and other man overboard signals. Distress signal transmissions are different than
standard AIS transmissions, so they appear differently on the chartplotter. Instead of tracking a distress signal
transmission for collision avoidance, you track a distress signal transmission to locate and assist a vessel or
person.
Navigating to a Distress Signal Transmission
When you receive a distress signal transmission, a distress signal alarm appears.
Select Review > Go To to begin navigation to the transmission.
AIS Distress Signal Device Targeting Symbols
Symbol Description
AIS distress signal device transmission. Select to see more information about the transmission and
begin navigation.
Transmission lost.
Transmission test. Appears when a vessel initiates a test of their distress signal device, and does not
represent a true emergency.
Transmission test lost.
Enabling AIS Transmission Test Alerts
To avoid a large number of test alerts and symbols in crowded areas such as marinas, you can select to receive
or ignore AIS test messages. To test an AIS emergency device, you must enable the chartplotter to receive test
alerts.
1 Select Settings > Alarms > AIS.
2 Select an option:
• To receive or ignore Emergency Position Indicating Radio Beacon (EPRIB) test signals, select AIS-EPIRB
Test.
• To receive or ignore Man Overboard (MOB) test signals, select AIS-MOB Test.
• To receive or ignore Search and Rescue Transponder (SART) test signals, select AIS-SART Test.
Turning Off AIS Reception
AIS signal reception is turned on by default.
Select Settings > Other Vessels > AIS > Off.
All AIS functionality on all charts and 3D chart views is disabled. This includes AIS vessel targeting and
tracking, collision alarms that result from AIS vessel targeting and tracking, and the display of information
about AIS vessels.
28 Charts and 3D Chart Views
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