Question 604 Rules of the Road

The correct answer is C) aground. The illustration D011RR shows the shapes of a vessel displaying two black balls stacked vertically. According to the International and Inland Navigation Rules, this configuration of shapes indicates that the vessel is aground. When a vessel is aground, it must display these two black balls to signal its status to other vessels in the area. The other options are incorrect because they do not match the shapes displayed in the illustration. A vessel that is towing would display different shapes, underwater operations would not require this specific configuration, and a drifting vessel would not display these particular shapes.