Question 119Navigation General

70% to pass

Which statement is TRUE for an unlighted, red and green, horizontally-banded buoys with the topmost band red?

A may either be cylindrical or conical since the shape has no significance
B are conical in shape and called nun buoys
C are cylindrical in shape and called can buoys
D are triangular in shape to indicate that it may not be possible to pass on either side of the buoy
AI Explanation

The correct answer is B) are conical in shape and called nun buoys. Unlighted, red and green, horizontally-banded buoys with the topmost band red are nun buoys, which are conical in shape. This is in accordance with the US Coast Guard's Aids to Navigation System, which specifies that nun buoys have a conical shape to indicate the direction of safe passage. The other options are incorrect because A) the shape of the buoy is significant and must be conical, C) can buoys have a cylindrical shape, and D) the triangular shape is not used for this type of buoy.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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