BOTH INTERNATIONAL & INLAND Which vessel is "underway" within the meaning of the Rules?

Correct Answer: Option B — A vessel drifting with the engine stopped

Rule 3(i) defines "underway" as any vessel that is not at anchor, made fast to the shore, or aground. A drifting vessel with its engine stopped meets this definition, whereas vessels tied to a buoy, aground, or anchored do not.