Question 404 Rules of the Road

The correct answer is A) Two prolonged followed by two short blasts. In a narrow channel, an overtaking vessel intending to pass on the other vessel's port side would sound the signal of two prolonged blasts followed by two short blasts. This is the internationally recognized signal to indicate the overtaking vessel's intention to pass on the port side of the vessel being overtaken, as specified in the International Regulations for Preventing Collisions at Sea (COLREGS). The other options are incorrect because they do not match the COLREGS requirements for the specific situation of an overtaking vessel passing on the port side in a narrow channel.