Question 549 Rules of the Road

The correct answer is B) A vessel drifting with the engine stopped. According to the Navigation Rules, both International and Inland, a vessel is considered "underway" when it is not at anchor, made fast to the shore, or aground. A vessel drifting with the engine stopped meets this definition, as it is not attached to a fixed position and is free to move with the current or wind. The other options are incorrect because: A) A vessel aground is not underway, C) A vessel tied to a mooring buoy is considered at anchor, and D) A vessel at anchor, even with the engine turning, is not underway.