B&G Vulcan Series, Operator'S Manual, Page: 154 / 198

Defining dangerous vessels
You can define an invisible guard zone around your vessel. When a
target comes within this distance, the symbol changes to the
“dangerous” target symbol. An alarm is triggered if activated in the
Alarm settings panel.
Speed and course indication
The extension line can be used to indicate speed and course for
targets, either as absolute (true) motion in the chart or relative to
your vessel.
A different line style is used on the extension lines to indicate
motion, as shown below.
AIS vessels shown with Absolute motion AIS vessels shown with Relative motion
AIS icon orientation
Sets the orientation of the AIS icon, either based on heading or COG
information.
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AIS | Vulcan Series Operator Manual