21. AIS Target Functions
21-10
If more information is needed, put the cursor in the
Target Dialog window then push the left mouse button
to get the Target Details window.
Note: Availability of data in the Target Details window
is subject to the content the AIS transponder reports.
The operator can set Closest Point of Approach (CPA), and Time to CPA (TCPA) to define dangerous AIS targets.
CPA and TCPA limits are common for ECDIS display and danger target log function of TT and AIS targets. The
ECDIS display shows a dangerous AIS target with its symbol blinking, in red.
Note that the CPA limit is only for ECDIS. AIS has its
own setting for dangerous targets and thus a target that is
dangerous on the AIS display can be safe on ECDIS and
vice versa. If an AIS target is within the CPA and TCPA
settings, it is shown as a dangerous AIS target on the
ECDIS display.
If an AIS target locates within the CPA and TCPA values, it is shown as a dangerous AIS target on the ECDIS
display. Note that the same situation occurs with tracked targets.
Note1: If your ship's position is based on Dead Reckoning, then CPA/TCPA and BCR/BCT values are not
calculated and not displayed.
Note2: If TCPA has a negative value it means that you have already passed the closest point and the AIS target is
going away from your ship.
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