Question 546 Rules of the Road

90% to pass

BOTH INTERNATIONAL & INLAND You are underway in fog when you hear the following signal: one short blast, one prolonged blast and one short blast in succession. Which of the following would it be?

A A power-driven vessel underway and making way through the water
B A sailing vessel underway with the wind abaft the beam
C A vessel towing
D A vessel at anchor
AI Explanation

The correct answer is D) A vessel at anchor. The signal of one short blast, one prolonged blast, and one short blast in succession is the signal given by a vessel at anchor to indicate its presence in conditions of restricted visibility, as specified in the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules. The other options are incorrect because they do not match the prescribed signal for a vessel at anchor. A power-driven vessel underway would give a different signal, a sailing vessel would not give this signal, and a vessel towing would also have a different sound signal.

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