Question 935 Rules of the Road

The correct answer is D) One prolonged blast followed by two short blasts at intervals of not more than two minutes. This is the correct fog signal for a vessel 75 meters in length, restricted in her ability to maneuver, at anchor, as per the International Regulations for Preventing Collisions at Sea (COLREGS). The COLREGS specify that a vessel restricted in her ability to maneuver must sound this fog signal while at anchor. The other options are incorrect because they do not match the specific requirements for a vessel of this size and status. Options A, B, and C describe different fog signals that would apply to vessels of different lengths or circumstances.