Coast Guard Exams
Question 457Rules of the Road90% to pass

INTERNATIONAL ONLY Two power-driven vessels are crossing within one half mile of each other as shown in illustration D042RR below. Vessel "A" sounds one short blast of the whistle. What does this signal mean?

Diagram for question 457
AI Explanation
The correct answer is D) None of the above. The one short blast of the whistle by Vessel "A" does not have the meanings indicated in options A, B, or C. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a one-blast signal is used to indicate "I am altering my course to starboard." This signal does not communicate the vessel's intent to overtake, operate astern propulsion, or leave the other vessel on its port side. The given options do not accurately reflect the meaning of the one-blast whistle signal in the context of the international rules for vessels crossing within one-half mile of each other.

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