Question 405 Rules of the Road

The correct answer is C) Two prolonged followed by two short blasts. This is the correct signal because according to the International Regulations for Preventing Collisions at Sea (COLREGS), in a narrow channel, an overtaking vessel must indicate its intention to pass on the port side of the vessel being overtaken by sounding the signal of "two prolonged blasts followed by two short blasts." This signals to the other vessel that the overtaking vessel intends to pass on the port side and requests the consent of the vessel being overtaken to safely execute the maneuver. The other options are incorrect because they do not match the COLREGS requirement for the overtaking vessel's signal in this situation. Option A is the general signal for a vessel intending to pass, while options B and D do not convey the specific intention to pass on the port side.