INTERNATIONAL ONLY In a narrow channel, a vessel trying to overtake another on the other vessel's port side, would sound which whistle signal?

Correct Answer: Option A — Two prolonged blasts followed by two short blasts

Under COLREG Rule 9(e)(i), a vessel intending to overtake another in a narrow channel must signal its specific side of passage. A port-side overtaking maneuver requires the sounding of two prolonged blasts followed by two short blasts to alert the vessel being overtaken of the intended action.