INTERNATIONAL ONLY You intend to overtake a vessel in a narrow channel, and you intend to pass along the vessel's port side. This action can only take place if the vessel to be overtaken takes action to permit safe passage. How should you signal your intention?

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

Rule 34(c)(i) of the COLREGS requires a vessel intending to overtake another in a narrow channel to signal its intent. Passing on the port side is indicated by two prolonged blasts followed by two short blasts, signaling the overtaken vessel to permit the maneuver.