INTERNATIONAL ONLY You intend to overtake a vessel in a narrow channel on the overtaking vessel's port side. This action requires the overtaken vessel to take action to permit safe passing. How should you signal your intentions?

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

COLREG Rule 9(e)(i) specifies that an overtaking vessel in a narrow channel intending to pass on the port side of the vessel ahead must sound two prolonged blasts followed by two short blasts. This signal notifies the overtaken vessel that action is required to permit safe passage.