Charts and 3D Chart Views Automatic Identification System The Automatic Identification System (AIS) enables you to identify and track other vessels. About AIS AIS alerts you to area traffic. When connected to an external AIS device, the chartplotter can show some AIS information about other vessels that are within range, that are equipped with a transponder, and that are actively transmitting AIS information. The information reported for each vessel includes the Maritime Mobile Service Identity (MMSI), the location, the GPS speed, the GPS heading, the time that has elapsed since the last position of the vessel was reported, the nearest approach, and the time to the nearest approach.
AIS Targeting on the Navigation Chart AIS Targeting Symbols GPSMAP ® 4000/5000 Series Owner’s Manual 15 ➊ ➍ ➏ ➋ ➎ ➌ Symbol Description ➊ AIS vessel. The vessel is reporting AIS information. The direction in which the triangle is pointing indicates the direction in which the AIS vessel is moving. AIS target is selected. ➋ AIS target is activated. The target appears larger on the chart. A green line attached to the target indicates the heading of the target. The MMSI, speed, and direction of the vessel appear beneath the target if the details setting is set to Show (page 16). If the AIS transmission from the vessel is lost, a message banner appears. ➌ AIS target is lost.
A green X indicates that the AIS transmission from the vessel is lost, and the chartplotter displays a message banner asking whether the vessel should continue to be tracked. If you discontinue vessel tracking, the lost target symbol disappears from the chart or the 3D chart view. ➍ Dangerous AIS target in range. The target flashes while an alarm sounds and a message banner appears. After the alarm has been acknowledged, a solid red triangle with a red line attached to it indicates the location and the heading of the target. If the safe-zone collision alarm is set to Off, the target flashes, but the audible alarm does not sound and the alarm banner does not appear (page 17).
If the AIS transmission from the vessel is lost, a message banner appears. ➎ The location of this symbol indicates the closest point of approach to a dangerous target, and the numbers near the symbol indicate the time to the closest point of approach to that target. ➏ Dangerous target is lost. A red X indicates that the AIS transmission from the vessel is lost, and the chartplotter displays a message banner asking whether the vessel should continue to be tracked. If you discontinue vessel tracking, the lost dangerous target symbol disappears from the chart or the 3D chart view.