Your ARPA has been tracking a target and has generated the targets course and speed. The radar did not receive a target echo on its last two scans due to the weather. What should you expect under these circumstances?
• ARPA target tracking logic and how it uses past positions (target "memory") • Conditions that cause a lost target alarm on ARPA (e.g., number of missed scans) • Difference between ARPA predicting motion from last known data vs using new radar echoes
• If the radar does not receive echoes from a tracked target for more than one or two scans, what is the ARPA designed to do for safety? • Would an ARPA be allowed to quietly keep displaying a target based only on old data without warning the navigator? Why or why not? • Which choice best matches a built‑in safety feature, rather than a guess or made‑up data?
• Identify which option describes a safety alert or warning function, not a data‑filling or guessing function. • Eliminate any option where the ARPA is clearly inventing new target data from non‑target returns (like sea clutter). • Recall from ARPA training that when a tracked target’s echo is missing for a set number of scans, a specific alarm/indication is required.
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