Your ARPA has two guard zones. What is the purpose of the inner guard zone?
• ARPA (Automatic Radar Plotting Aid) guard zones – difference between inner and outer zones • How an inner guard zone helps prevent close‑quarters surprises near your own ship • Which option describes a function that is unique to the inner zone rather than the outer zone
• Which option best describes a warning about targets that appear very close to own ship without prior tracking? • Does the inner guard zone mainly help with approach to CPA limits, or does it deal with objects that are already inside or just popping up near you? • Think about small, weak targets: would they more likely first appear in the outer zone or only be seen when they are already close in?
• Identify which choices describe something that could be done by either guard zone (not unique to the inner one). • Check which option specifically mentions targets that are first detected or initially detected within the inner area. • Verify which option is about preventing sudden close-range threats rather than general early warning at longer range.
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