INTERNATIONAL ONLY Which vessel would sound two prolonged blasts followed by one short blast on the whistle?

Correct Answer: Option C — A vessel overtaking another in a narrow channel

Rule 34(c)(i) mandates that a vessel intending to overtake another in a narrow channel shall indicate her intention by sounding two prolonged blasts followed by one short blast. This signal informs the vessel being overtaken of the intention to pass on the starboard side.