Your ARPA has two guard zones.What is the purpose of the inner guard zone（）.<br>A:Alert the watch officer that a vessel is approaching the preset CPA limit<br>B:Warn of small targets that are initially detected closer than the outer guard zone<br>C:Guard against target loss during critical maneuvering situations<br>D:Sound an alarm for targets first detected within the zone

Your ARPA has two guard zones.What is the purpose of the inner guard zone（）.
A:Alert the watch officer that a vessel is approaching the preset CPA limit
B:Warn of small targets that are initially detected closer than the outer guard zone
C:Guard against target loss during critical maneuvering situations
D:Sound an alarm for targets first detected within the zone

出自：海船船员证

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