Garmin 400/500 Owner's Manual page 30

Using Charts
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.
Activated
dangerous
target
MMSI
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.
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Projected course
Heading Direction of turn
Activated
target
MMSI
Target with Course over Ground and Heading
Showing AIS Vessels on a Chart or on a 3D Chart
View
AIS requires the use of an external AIS device and active
transponder signals from other vessels.
You can configure how other vessels appear on a chart or on a 3D
chart view. The display range configured for one chart or one 3D
chart view are applied only to that chart or to that 3D chart view.
The details, projected heading, and trails settings configured for one
chart or one 3D chart view are applied to all charts and to all 3D
chart views.
NOTE: The Fishing chart and Mariner's Eye 3D are available with a
preprogrammed BlueChart g2 Vision data card.
1. From the Home screen, select Charts.
Projected course
Heading
GPSMAP 400/500 Series Owner's Manual