Navigation General · ARPA
After own ship executes a course change to avoid a collision, the ARPA trial maneuver function is useful because it:
- AAutomatically commands the autopilot to the new heading
- BAllows the navigator to evaluate the effect of a proposed maneuver on CPA/TCPA before committing to it✓ Correct
- CAlerts the target vessel of own ship's intended maneuver via DSC
- DResets all ARPA target tracks to the new reference frame
Explanation
The trial maneuver (or 'what-if') function lets the navigator input a proposed course and/or speed change and observe the resulting predicted CPA/TCPA values for all tracked targets before actually maneuvering. It is a decision-support tool; it does not transmit information to other vessels or control the steering gear.
Authority: Radar Navigation Manual (Pub. 1310), Ch. 6
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