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AIS Targets
Each target is represented by an icon that indicates the vessel type. The color of the target icon is determined by the AIS Target Type
shown on the AIS List. The target type shows its status with the following shapes and additional color details.
For example, the Cargo Target appearance will change depending on its status, and whether it is moving or
anchored, as shown in the following table:
NOTE: See Open the AIS Target List for more information about the AIS List and the AIS Target Key.
Underway Icon Anchor Icon Status Description
Dangerous
The target is active and detected as dangerous based
on the CPA (Closest Point of Approach) and TCPA (Time
to Closest Point of Approach). The target is outlined in
red.
Uncertain
The target is active, but the calculated CPA (Closest
Point of Approach) and TCPA (Time to Closest Point of
Approach) have not been received in the last 4 minutes.
The target is outlined in white.
Sleeping
The target is active or inactive, and it is moving slower
than the sleeping target threshold. To set the threshold
see AIS and MARPA: Set Target Display Settings.
Inactive
The target is identified and moving, but it is not being
tracked by the AIS.
Active
The target is identified, tracked, moving, and sending
data to the AIS.
Lost
The target is not available for tracking. A target may be
lost if its signal has not been received in the last 8
minutes. The target will be grayed out and displayed
with its last available position on the view. To adjust the
lost threshold, see AIS and MARPA: Set Target Display
Settings.
AIS
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