Question 342 Deck Safety
70% to passWhich 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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