Question 483 Rules of the Road

90% to pass

INTERNATIONAL ONLY Which vessel would sound a fog signal of one prolonged and two short blasts?

A A WIG craft underway
B A vessel constrained by her draft
C A vessel being towed
D A power-driven vessel underway
AI Explanation

The correct answer is B) A vessel constrained by her draft. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a vessel constrained by her draft is required to sound a fog signal of one prolonged blast followed by two short blasts when underway. This signifies that the vessel is unable to deviate from her course due to the depth of water or other navigational constraints. The other options are incorrect because: A) A WIG (Wing-In-Ground) craft would not sound this particular fog signal, C) A vessel being towed would sound a different fog signal, and D) A power-driven vessel underway would have a different fog signal requirement.

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