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42 GPSMAP 400/500 Series Owner’s Manual
Viewing Information
About AIS
AIS alerts you to area trafc. 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 vessel
AIS Targeting on the Navigation Chart
Dangerous
AIS target
Lost
AIS target
Closest point and
time of approach to
dangerous target
Tracking
AIS target
AIS Targeting Symbols
Symbol Description
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.
Target is selected.
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 44). If the AIS transmission from the vessel is
lost, a message banner appears.
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.
Dangerous target in range. The target ashes while an
alarm sounds and a message banner appears. After the
alarm is 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 ashes, but the audible alarm does not sound and
the alarm banner does not appear (page 45). If the AIS
transmission from the vessel is lost, a message banner
appears.