If ARPA loses track on a target, what is the recommended procedure?

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Losing ARPA track means the system can no longer provide a reliable estimate of the target’s range, bearing, or relative motion. The safest way to restore a trustworthy picture is to reacquire the target manually and verify your own vessel data; reinitialize tracking if needed. Manually reacquiring ensures you’re locking onto the target based on current radar returns rather than a possibly corrupted automated track. Verifying your own vessel data (heading, speed, position) makes sure the ARPA computations use accurate inputs, which is essential for correct target motion prediction. If the track remains fragile or data integrity is suspect, reinitializing the tracking state resets the system and eliminates stale or inconsistent information, giving you a clean start for a new tracking solution. Ignoring the target, waiting for instructions, or continuing with automated tracking when the track is lost all leave you without a reliable awareness of the target, increasing collision risk.