Question 4981 Deck General

70% to pass

Small floes of rough, hummocky sea ice capable of damaging a vessel _______________.

A are usually seen at night before they are close enough to provide a radar echo
B are indistinguishable from sea return on the PPI
C are invisible to radar when covered with a thick layer of snow
D can usually be detected by radar in a smooth sea at a range of 4 to 6 kilometers
AI Explanation

The correct answer is D) can usually be detected by radar in a smooth sea at a range of 4 to 6 kilometers. This is correct because small floes of rough, hummocky sea ice can typically be detected by radar at a range of 4 to 6 kilometers in a smooth sea. The uneven, hummocky surface of the ice reflects radar signals, making it distinguishable from the surrounding smooth sea surface. The other options are incorrect because: A) the ice floes would be visible during the day, not just at night; B) the ice floes can be distinguished from sea return on the radar display; and C) the ice floes can be detected by radar even if covered in snow.

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