182. Small floes of rough, hummocky sea ice are capable of damaging a vessel. Which statement is TRUE?

The floes are invisible to radar when covered with a thick layer of snow
They are indistinguishable from sea return on the PPI
They can usually be detected by radar in a smooth sea at a range of 2 to 4 miles
The floes are usually seen at night before they are close enough to provide a radar echo

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