Question 475 Rules of the Road

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INTERNATIONAL ONLY Which signal is sounded ONLY by a vessel in sight of another?

A One short blast on the whistle
B One prolonged blast on the whistle
C One short, one prolonged, and one short blast on the whistle
D Four short blasts on the whistle
AI Explanation

The correct answer is A) One short blast on the whistle. This signal is sounded only by a vessel in sight of another vessel to indicate "I am altering my course to starboard." The International Regulations for Preventing Collisions at Sea (COLREGS) specifically state that this one-short-blast signal is used to communicate a vessel's intended course change when in sight of another vessel. The other options are incorrect because they do not represent the specific signal used to indicate a change of course to starboard in the presence of another vessel. Option B is a prolonged blast, Option C is a different sequence of blasts, and Option D is four short blasts, which has a different meaning under the COLREGS.

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