INTERNATIONAL ONLY Two prolonged blasts followed by one short blast on the whistle is a signal which could be sounded by a __________.

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

Under COLREGS Rule 34(c)(i), a vessel intending to overtake another in a narrow channel or fairway shall indicate her intention by sounding two prolonged blasts followed by one short blast, signifying intent to pass on the starboard side.