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30 GPSMAP 620 and GPSMAP 640 Owner’s Manual
Marine Mode: Managing Information From Other Vessels
Marine Mode: Managing Information
from Other Vessels
Use the Information screen to view and manage information about
other boats.
NOTE: To view information about other boats, your unit must be
connected to an external Automatic Identication System (AIS) or
Digital Selective Calling (DSC) device.
Viewing AIS Information
The Automatic Identication System (AIS) enables you to identify
and track other vessels.
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 Targeting on the Navigation Chart
Activated
AIS target
Dangerous
target is lost
AIS vessel
Dangerous
target
Lost 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.
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 32). 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.