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44 GPSMAP 400/500 Series Owner’s Manual
Viewing Information
the projected course line.
When course over ground, heading, and rate-of-turn information
are provided by an activated AIS target, the projected course of the
target is calculated based on the course over ground and the rate-of-
turn information. The direction in which the target is turning, which
is also based on the rate-of-turn information, is indicated by the
direction of the barb at the end of the heading line. The length of the
barb does not change.
MMSI
Heading
Direction of turn
Projected course
Activated
dangerous
target
Target with Course over Ground, Heading, and Rate of Turn
When course over ground and heading information are provided by
an activated AIS target, but rate-of-turn information is not provided,
the projected course of the target is calculated based on the course
over ground information.
MMSI
Heading
Projected course
Activated
target
Target with Course over Ground and Heading
Turning Off AIS Reception
AIS signal reception is turned on by default.
From the Home screen, select > > .
When off, all AIS functionality on all charts and on all 3D
chart views is disabled. This includes AIS vessel targeting and
tracking, collision alarms that result from AIS vessel targeting
and tracking, and information about AIS vessels.
Enabling AIS-SART Transmission Test Alerts
In order to avoid a large number of test alerts and symbols in
crowded areas such as marinas, AIS-SART test alerts ignored
by default. To test an AIS SART device, you must enable the
chartplotter to receive test alerts.
From the Home screen, select > >
.