Question 457 Rules of the Road

90% 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?

Rules of the Road Question 457 diagram
A "I intend to overtake you on your starboard side"
B "I am operating astern propulsion"
C "I intend to leave you on my port side"
D None of the above
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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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG Navigation Center
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