Question 216Navigation General

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In illustration D044NG below, what type of buoy is indicated by the letter D?

Diagram for USCG Navigation General: In illustration D044NG below, what type of buoy is indicated by the letter D?
A nun
B pillar
C can
D spar
AI Explanation

The correct answer is A) nun. The letter "D" in illustration D044NG indicates a nun buoy, which is a conical-shaped buoy that marks the port (left) side of a navigable channel when entering from the sea. Nun buoys have an even number and are painted red. The other answer choices are incorrect because: B) pillar buoys are cylindrical in shape, C) can buoys are cylindrical and mark the starboard (right) side of a channel, and D) spar buoys are vertical pole-like buoys used to mark isolated dangers or obstructions.

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