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4. AIS OPERATION
4-8
4.12 CPA/TCPA Alarm
When the predicted CPA of any AIS target or ARP target becomes smaller than the preset CPA
alarm range and its predicted TCPA less than the preset TCPA alarm limit, an audio alarm sounds
and the symbol of the offending AIS target changes to the dangerous target symbol.
Dangerous target symbol
You may silence the audio alarm with the CANCEL/HL OFF key. The flashing of the symbol stops
when the target’s CPA and TCPA become greater than the CPA and TCPA alarm setting. Pre-
dicted range at the Closest Point of Approach (CPA) and predicted time to CPA (TCPA) of each
AIS target are monitored.
This feature helps alert you to targets which may be on a collision course with own ship.
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.
Triangle is thicker
than that of active
target
Off
0.5nm
1nm
2nm
3nm
5nm
6nm
30sec
1min
2min
3min
4min
5min
6min
12min