In ARPA target handling, which statement about ARPA operation is incorrect?

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Multiple Choice

In ARPA target handling, which statement about ARPA operation is incorrect?

ARPA relies on data from outside sources to compute and maintain tracks. Even in a heads-up or un-stabilized display, the system uses information such as the ship’s heading and speed to transform radar measurements into a consistent reference frame and to predict future target positions. Without these external inputs, the tracking and prediction would be unreliable, so ARPA cannot operate correctly without them. That’s why the statement about operating without external inputs is incorrect. The other points reflect actual ARPA behavior: it can detect targets even when AIS is not present, its plotting is driven by relative motion between ownship and targets, and when targets are close, the tracker can swap from one target to another, which is a known consideration for maintaining accurate tracks.

ARPA relies on data from outside sources to compute and maintain tracks. Even in a heads-up or un-stabilized display, the system uses information such as the ship’s heading and speed to transform radar measurements into a consistent reference frame and to predict future target positions. Without these external inputs, the tracking and prediction would be unreliable, so ARPA cannot operate correctly without them. That’s why the statement about operating without external inputs is incorrect. The other points reflect actual ARPA behavior: it can detect targets even when AIS is not present, its plotting is driven by relative motion between ownship and targets, and when targets are close, the tracker can swap from one target to another, which is a known consideration for maintaining accurate tracks.

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