INTERNATIONAL ONLY Which whistle signal may be sounded by one of two vessels in sight of each other?
Official USCG Answer & Rule Citation
Correct Answer: Option D — One short blast
Under COLREGS Rule 34(a), a vessel underway and in sight of another when altering course to starboard indicates the maneuver with one short blast. International Rules restrict maneuvering signals exclusively to overtaking or meeting situations in sight, making this specific signal applicable.
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