Question 318Navigation General

70% to pass

Which navigational mark may only be lettered?

A An unlighted, green, can buoy
B A port side day-shape
C A red buoy
D A spherical buoy
AI Explanation

The correct answer is D) A spherical buoy. Navigational marks that may only be lettered are spherical buoys. According to the U.S. Coast Guard's Aids to Navigation System, spherical buoys are the only buoy shape that can have a letter designation, such as "C" or "G", to indicate their purpose or location. The other options, such as can buoys, day-shapes, and red buoys, do not use lettering and instead use other visual characteristics to convey their meaning.

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