Question 821 Rules of the Road

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BOTH INTERNATIONAL & INLAND Which vessel must exhibit a conical shape, apex downwards?

A A 15-meter vessel proceeding under sail when also being propelled by machinery
B A 10-meter vessel engaged in fishing
C A 20-meter vessel restricted in her ability to maneuver while carrying out her work
D All of the above
AI Explanation

You are correct, the answer is A) A 15-meter vessel proceeding under sail when also being propelled by machinery. The reason this is the correct answer is that under the International Regulations for Preventing Collisions at Sea (COLREGS), a vessel of 12 meters or more in length when proceeding under sail and also being propelled by machinery must exhibit a conical shape, apex downwards, as an additional signal. This is specified in Rule 25(c) of the COLREGS. The other options are incorrect because they do not describe a vessel that is required to exhibit the conical shape signal. A 10-meter vessel engaged in fishing and a 20-meter vessel restricted in her ability to maneuver do not have this requirement under the COLREGS.

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