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3. ARP OPERATION
3-8
3.9 CPA/TCPA Alarm
When the predicted CPA of any ARP target or AIS target becomes smaller than the preset CPA
alarm range and its predicted TCPA less than the preset TCPA alarm limit, the audio alarm sounds
and the target plot symbol of the offending target changes to a triangle and flashes together with
its vector. You may silence the audio alarm with the CANCEL/HL OFF key. The flashing of the
triangle plot stops when the vessel’s CPA and TCPA are out of the CPA and TCPA alarm setting.
The ARP continuously monitors the predicted range at the Closest Point of Approach (CPA) and
predicted time to CPA (TCPA) of each track to own ship.
This feature helps alert you to targets which may be on a collision course with own ship. However,
it is important that GAIN, A/C SEA, A/C RAIN and other radar controls are properly adjusted and
the ARP is set up so that it can track targets effectively.
1. Press the MENU key to open the menu.
2. Choose Target and press the ENTER key.
3. Choose CPA and press the ENTER key.
4. Choose appropriate CPA distance and press the ENTER key.
5. Choose TCPA and press the ENTER key.
6. Choose appropriate TCPA and press the ENTER key.
7. Press the MENU key to close the menu.
CAUTION
CAUTION
The CPA/TCPA alarm should never be
relied upon as the sole means for detect-
ing the risk of collision. The navigator is
not relieved of the responsibility to keep
visual lookout for avoiding collisions,
whether or not the radar or other plotting
aid is in use.
Off
0.5nm
1nm
2nm
3nm
5nm
6nm
30sec
1min
2min
3min
4min
5min
6min
12min