Question 498 Rules of the Road

The correct answer is D) Two prolonged blasts every two minutes. According to the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules, a vessel that is not under command, which includes a vessel that is dead in the water, must sound the fog signal of "two prolonged blasts every two minutes" to indicate its status to other vessels in the area. The other answer choices are incorrect because they do not match the specific fog signal required for a vessel that is not under command. A, B, and C describe different fog signals that are used for other vessel situations, such as a vessel making way through the water or a vessel restricted in its ability to maneuver.