Question 466 Rules of the Road

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INTERNATIONAL ONLY A whistle signal of one prolonged, one short, one prolonged and one short blast, is sounded by which vessel?

A A vessel being overtaken in a narrow channel
B A vessel towing a submerged object
C A vessel at anchor warning of her position
D A vessel in distress
AI Explanation

The correct answer is A) A vessel being overtaken in a narrow channel. The International Regulations for Preventing Collisions at Sea (COLREGS) state that the signal of one prolonged, one short, one prolonged and one short blast is used by a vessel being overtaken to indicate her intention to maintain her course and speed. This allows the overtaking vessel to take appropriate action to safely pass. The other options are incorrect because: B) is the signal for a vessel towing a submerged object, C) is the signal for a vessel at anchor warning of her position, and D) is the signal for a vessel in distress.

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