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



Red AIS distress signal symbol

AIS distress signal device transmission. Select to see more information about the transmission and begin navigation.

Red AIS distress signal lost symbol

Transmission lost.

Green AIS distress test signal symbol

Transmission test. Appears when a vessel initiates a test of their distress signal device, and does not represent a true emergency.

Green AIS distress signal test lost symbol

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 menu > 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.

GUID-25CCEC48-337E-47C0-8B89-5C35CCDB65AC v27
March 2024