Question 555 Rules of the Road

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BOTH INTERNATIONAL & INLAND What shape shall a vessel 15 meters in length, proceeding under sail as well as being propelled by machinery, exhibit?

A two cones with their apexes together
B one black ball
C a cone with its apex downward
D a basket
AI Explanation

The correct answer is C) a cone with its apex downward. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a vessel 15 meters or more in length, proceeding under sail as well as being propelled by machinery, must exhibit a cone shape with its apex downward as an additional visual signal. This shape indicates that the vessel is a sailing vessel with mechanical propulsion. The other options are incorrect because: A) two cones with their apexes together is the shape for a vessel not under command, B) a single black ball is the shape for a vessel restricted in its ability to maneuver, and D) a basket is not a recognized shape under the COLREGS.

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