Question 943 Rules of the Road

The correct answer is B) Two prolonged blasts. According to the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules, a power-driven vessel underway in fog and making no way (not making any headway) must sound the signal of two prolonged blasts at intervals not exceeding 2 minutes. This signals to other vessels in the area that the vessel is underway but not under command. The other options are incorrect because: A) One prolonged and two short blasts is the signal for a vessel not under command, B) One long blast is the signal for a vessel at anchor, and D) One prolonged blast is the signal for a vessel towing another vessel.