Question 18Navigation General

70% to pass

Which buoy may be even numbered?

A Unlighted nun buoy
B Mid-channel buoy
C Lighted green buoy
D All of the above
AI Explanation

The correct answer is A) Unlighted nun buoy. Unlighted nun buoys may be even-numbered as they mark the port (left) side of a channel when entering from seaward. This is in accordance with the United States Aids to Navigation System (USATONS) which dictates that even-numbered buoys mark the port side of a channel. The other options (B, C, and D) are incorrect because mid-channel buoys, lighted green buoys, and all buoys are not necessarily even-numbered under the USATONS.

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