Question 953 Rules of the Road

The correct answer is C) In fog you must sound one prolonged blast at two minute intervals when making way. This is correct because under the International Regulations for Preventing Collisions at Sea (COLREGS), a vessel proceeding under sail with the auxiliary engine running and the propeller engaged is considered a power-driven vessel. As a power-driven vessel making way in fog, the COLREGS require the vessel to sound one prolonged blast at intervals of not more than 2 minutes. The other answer choices are incorrect because: A) is for a sailing vessel without an auxiliary engine, B) is for a vessel under sail without the engine running, and D) is incorrect as the vessel is considered a power-driven vessel when the engine is engaged, regardless of the amount of propelling power coming from the sails.