Question 976 Rules of the Road

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BOTH INTERNATIONAL & INLAND While underway in fog you hear a vessel sound one prolonged blast followed by two short blasts. What does this signal indicate?

A A vessel towing
B A vessel being towed
C A vessel aground
D A pilot vessel engaged on pilotage duty
AI Explanation

The correct answer is A) A vessel towing. According to the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules, a vessel towing another vessel must sound one prolonged blast followed by two short blasts to indicate its status while underway in restricted visibility. This signal alerts other vessels in the area that a towing operation is in progress, allowing them to take the appropriate precautions. The other options are incorrect because they do not match the prescribed sound signal for a vessel towing. A vessel being towed would not make this signal, nor would a vessel aground or a pilot vessel engaged in pilotage duty.

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