Question 550 Rules of the Road

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BOTH INTERNATIONAL & INLAND While underway in fog, you hear a signal of one prolonged blast followed by three short blasts. Which vessel shall sound this fog signal?

A A vessel at anchor
B An unmanned vessel being towed
C A manned vessel being towed
D A towing vessel
AI Explanation

The correct answer is C) A manned vessel being towed. The fog signal of one prolonged blast followed by three short blasts is the signal required for a vessel being towed, as specified in the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules. The other options are incorrect because: A) A vessel at anchor would sound a different signal of one prolonged blast at intervals, and B) An unmanned vessel being towed would not be required to sound any fog signal. D) A towing vessel would sound a different signal of one prolonged blast followed by two short blasts.

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