Question 997 Rules of the Road

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BOTH INTERNATIONAL & INLAND While underway in fog, you hear a short blast, a prolonged blast, and a short blast of a whistle. This signal indicates which vessel(s)?

A Several vessel being towed in fog
B A sailboat underway in fog
C A vessel anchored in fog
D A vessel towing in fog
AI Explanation

The correct answer is C) A vessel anchored in fog. The signal you described - a short blast, a prolonged blast, and another short blast - is the signal required for a vessel that is at anchor in fog, as per the International Regulations for Preventing Collisions at Sea (COLREGS). This signal is used to indicate the vessel's position and prevent collisions while the vessel is anchored and unable to maneuver. The other options are incorrect because they do not match the signal described. Option A is for several vessels being towed, option B is for a sailboat underway, and option D is for a vessel towing another vessel, all of which have different sound signal requirements in the COLREGS.

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