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2.11.4 Collision avoidance calculation
The Multigraphic constantly scans messages received via the A.I.S.
receiver/transponder. The unit will generate an alarm if a target is detected and its
CPA and TCPA are both below the level defined. The relevant target will appear red.
Alarm principle
The alarm has been set for « CPA < 4 Mn and TCPA < 20 minutes ». As a result,
CPA being below 4 miles and the TCPA calculated value being below 20 minutes,
the Multigraphic triggers an alert. From version 2.4 of Multigraphic it is possible to
relay AIS Alarms on the V3.1 radio receiver. To do this, an alarm must be validated
on the AIS page and the Alarm status is valid. As soon as a target is in alarm, the
radio receiver will emit three short beeps continuously until the alarm is cleared.
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