BOTH INTERNATIONAL & INLAND While underway and towing, your vessel enters fog. Which fog signal should you sound?
Official USCG Answer & Rule Citation
Correct Answer: Option B — One prolonged blast and two short blasts
Under Inland Rule 34(a), two short blasts indicates 'I intend to leave you on my starboard side' (starboard-to-starboard pass), requiring an identical two short blasts confirmation.
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