14. AIS, DSC MESSAGE
14-7
14.11 CPA/TCPA Alarm
This alarm helps you keep your ship away from collision by warning of targets on a
collision course. The ARPA continuously monitors the predicted range at the Closest
Point of Approach (CPA) and predicted time to CPA (TCPA) of each tracked target.
When both the predicted CPA and TCPA are less than their set values, the target sym-
bol turns red, the alarm sounds and the message "CPA/TCPA Alarm" appears and
flashes at the top of the screen.
Make sure that the gain, sea and rain controls are correctly adjusted before you use
this alarm. CPA/TCPA alarm ranges must be set correctly according to the size, ton-
nage, speed, turning performance and other characteristics of your ship.
How to set the CPA/TCPA alarm
1. Open the home screen, then tap [Settings] - [Targets].
2. Turn on [CPA/TCPA Alarm].
3. Tap [CPA Alarm Value] or [TCPA Alarm Value] to display the software keyboard.
4. Set the value, then tap [] to confirm.
5. Tap the close button to finish.
How to acknowledge the CPA/TCPA alarm
The CPA/TCPA alarm sounds when the CPA and TCPA of an ARPA target are within
the CPA/TCPA alarm range. The alarm indication "CPA/TCPA Alarm" appears and
flashes at the top of the screen. To acknowledge the alarm and stop the audio alarm
and flashing of the indication, tap the indication "CPA/TCPA Alarm" (see
subsection 2.10.8). (The ARPA vector must be displayed at least 30 seconds to cal-
culate CPA and TCPA.)
How to deactivate the CPA/TCPA alarm
1. Open the home screen, then tap [Settings] - [Targets].
2. Turn off [CPA/TCPA Alarm].
3. Tap the close button to finish.
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