Question 991Rules of the Road90% to pass
BOTH INTERNATIONAL & INLAND What is the optional whistle signal which may be sounded by a vessel at anchor?
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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