Beyond ARPA data, what should be used to verify track data consistency?

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When checking track data beyond ARPA, you verify consistency by cross-checking with other sources such as radar imagery or AIS. ARPA handles automatic tracking, but its results can be affected by radar clutter, target misidentification, or tracking failures. Visual radar imagery lets you confirm the target’s actual echo and its path on the screen, ensuring the displayed track matches what you see geometrically. AIS provides real-time position, course, speed, and identity from other vessels, so you can confirm that the ARPA track corresponds to the same vessel. If AIS shows a different position or identity, it flags potential mis-tracking or spoofing, prompting you to reassess the ARPA track.

Relying solely on ARPA, or using unrelated sources like weather reports or a navigator’s guess, doesn’t give the necessary confirmation for track integrity.