Which single-letter sound signal may be made only in compliance with the International Rules of the Road?
Official USCG Answer & Rule Citation
Correct Answer: Option A — D
Under USCG Deck Safety, SOLAS Chapter III, and 46 CFR regulations, when addressing 'Which single-letter sound signal may be made only in compliance with the International Rules of the Road', the mandated standard is: 'D'.
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