INTERNATIONAL ONLY Which signal is required to be sounded by a power-driven vessel ONLY?
Official USCG Answer & Rule Citation
Correct Answer: Option D — A signal meaning, "I am altering my course to starboard."
COLREGS Rule 34(a) mandates that one short blast signifies an alteration of course to starboard. This signal is exclusively for power-driven vessels maneuvering in sight of one another. Other signals, such as those for restricted visibility or overtaking, involve different sound patterns or are not limited to power-driven vessels.
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