Question 474 Rules of the Road

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INTERNATIONAL ONLY Which whistle signal may be sounded by one of two vessels in sight of each other?

A One short, one prolonged, and one short blast
B One prolonged blast
C Four short blasts
D One short blast
AI Explanation

The correct answer is D) One short blast. According to the International Regulations for Preventing Collisions at Sea (COLREGS), one short blast on the whistle is the signal that may be sounded by one of two vessels in sight of each other to indicate "I intend to leave you on my port side". This is a common maneuvering signal used to communicate the intended action of a vessel. The other answer choices are incorrect because they do not represent the standard whistle signal for this specific maneuvering situation between two vessels in sight of each other under the COLREGS rules.

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