Extension lines
The length of the extension lines for your vessel and for other vessels can be set by the user.
• A: Heading
• B: Course Over Ground (COG)
The length of the extension lines is either set as a fixed distance, or to indicate the distance
the vessel will move in the selected time period. If no options are turned on for This vessel
then no extension lines are shown for your vessel.
Your own vessel heading information is read from the active heading sensor, and COG
information is received from the active GPS.
For other vessels COG data is included in the message received from the AIS system.
Defining dangerous vessels
You can define an invisible guard zone around your vessel. When a target comes within the
set limits, 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 | NSS evo3 Operator Manual
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