Which vectors are affected by Trial Maneuver in ARPA operations?

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Multiple Choice

Which vectors are affected by Trial Maneuver in ARPA operations?

Trial Maneuver simulates a change in your ownship’s speed and course to see how CPA/TCPA would be affected. This directly updates your ownship true vector (ER) because that vector represents the vessel’s actual motion. Because the contacts’ relative motion (RM) is calculated from both your ownship motion and each target’s motion, changing your ownship vector automatically recalculates all RM vectors. The targets’ own true vectors remain as the actual target motions; they’re not altered by the maneuver itself, only how you see them relative to your updated ownship. So, both the ownship true vector and the contacts relative vectors are affected by Trial Maneuver.

Trial Maneuver simulates a change in your ownship’s speed and course to see how CPA/TCPA would be affected. This directly updates your ownship true vector (ER) because that vector represents the vessel’s actual motion. Because the contacts’ relative motion (RM) is calculated from both your ownship motion and each target’s motion, changing your ownship vector automatically recalculates all RM vectors. The targets’ own true vectors remain as the actual target motions; they’re not altered by the maneuver itself, only how you see them relative to your updated ownship. So, both the ownship true vector and the contacts relative vectors are affected by Trial Maneuver.

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