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Set desired limits for CPA and TCPA. Note, these limits are only for ECDIS. ARPA radar has its own setting for
dangerous targets and thus a target which is dangerous at ARPA display can be safe on ECDIS or vice versa. If an
ARPA target is inside CPA and TCPA, it is shown as dangerous ARPA target on ECDIS display. Log interval
defines time period for logging.
Note! If TCPA has a negative value it means that you have already passed the closest point and the ARPA target is
going away form your own ship. See example below:
How to view ARPA target tracking data of reference targets
On the ECDIS display move cursor above desired ARPA radar target with letter "R" in its number and press
INFO/HELP push button. Following Target display dialog box appears.
Target display dialog for Reference Target consists following information:
•
Targets number and its status
•
•
Position
•
CPA and TCPA
•
Distance and true bearing from own ship
•
RefNum, which is the number of reference target in the current reference target file
•
LifeTime, which shows how long the target has been used as reference target without a break
in tracking. A long life time indicates a good reference target.
322 • • • • Target functions
Status can be Query, Tracking or Lost.
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