Question 449 Rules of the Road

The correct answer is C) A vessel overtaking another in a narrow channel. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a vessel overtaking another vessel in a narrow channel must sound two prolonged blasts followed by one short blast on the whistle. This signal indicates the overtaking vessel's intention to pass the other vessel. The other options are incorrect because they do not match the specific whistle signal described in the question. A vessel engaged in mineclearance would use different signals, and vessels at anchor or engaged in fishing would not need to sound this particular overtaking signal.