Question 342 Deck Safety

70% to pass

Which single-letter sound signal may be made only in compliance with the International Rules of the Road?

A D
B F
C Q
D U
AI Explanation

The correct answer is A) D. The D signal, which is a continuous sounding of a whistle or horn, may only be made in compliance with the International Regulations for Preventing Collisions at Sea (COLREGS), also known as the International Rules of the Road. The D signal is used to indicate a vessel is maneuvering with difficulty and requires the give-way vessel to take early and substantial action to avoid collision. The other answer choices (F, Q, and U) do not represent single-letter sound signals that are specifically regulated by the International Rules of the Road in this manner.

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Official Resources
46 CFR Lifesaving Equipment USCG Marine Safety Center USCG National Maritime Center
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