Question 991 Rules of the Road

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BOTH INTERNATIONAL & INLAND What is the optional whistle signal which may be sounded by a vessel at anchor?

A Four short blasts
B Two prolonged followed by one short blast
C One short, one prolonged, followed by one short blast
D One short followed by two prolonged blasts
AI Explanation

The correct answer is C) One short, one prolonged, followed by one short blast. This signal is the optional whistle signal that may be sounded by a vessel at anchor, as specified in the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules. This signal serves to draw attention to the vessel's presence and location when at anchor. The other options are incorrect because they do not match the prescribed signal for a vessel at anchor. A and D are different signaling patterns, while B describes the signal for a vessel not under command.

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