What are typical ARPA alarms, and what do they indicate?

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Multiple Choice

What are typical ARPA alarms, and what do they indicate?

ARPA alarms are designed to warn you of potential collision risk and unusual target behavior, so you can take timely action. The CPA/TCPA alarms indicate that the predicted closest approach to another vessel is approaching or that the time to reach that closest point is short, signaling a possible collision. When these alarms sound, you should actively reduce risk by adjusting speed or course and increasing monitoring of the target. There are also target behavior alarms, which warn of unpredictable maneuvers or instability in the target’s track, prompting you to verify the data, maintain a safe watch, and be prepared to maneuver if needed. The other options describe system or sensor faults (radar self-check status, power supply failure) or external signal loss (GPS), none of which are typical ARPA collision-risk alarms.

ARPA alarms are designed to warn you of potential collision risk and unusual target behavior, so you can take timely action. The CPA/TCPA alarms indicate that the predicted closest approach to another vessel is approaching or that the time to reach that closest point is short, signaling a possible collision. When these alarms sound, you should actively reduce risk by adjusting speed or course and increasing monitoring of the target. There are also target behavior alarms, which warn of unpredictable maneuvers or instability in the target’s track, prompting you to verify the data, maintain a safe watch, and be prepared to maneuver if needed. The other options describe system or sensor faults (radar self-check status, power supply failure) or external signal loss (GPS), none of which are typical ARPA collision-risk alarms.

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