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6. RADAR
6-26
6.26.7 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 the predicted CPA or TCPA is less than their set values, 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, tonnage, speed,
turning performance and other characteristics of your ship.
How to set the CPA/TCPA alarm
1. Select [Menu] on the menu icon bar to open the main menu.
2. Select [Targets].
3. Select the [ON] icon in [CPA/TCPA Alarm].
4. Select [CPA Alarm Value] or [TCPA Alarm Value] to display the software key-
board.
5. Set the value then select [Confirm].
6. Select [Close] to exit the menu.
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, select (tap) the indication "CPA/TCPA Alarm" (see
paragraph 2.10.7). (The ARPA vector must be displayed at least 30 seconds to calcu-
late CPA and TCPA.)
How to deactivate the CPA/TCPA alarm
1. Select [Menu] on the menu icon bar to open the main menu.
2. Select [Targets].
3. Select the [OFF] icon in [CPA/TCPA Alarm].
4. Select [Close] to exit the menu.
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