BOTH INTERNATIONAL & INLAND Which of the following describes a vessel displaying the shapes shown in illustration D011RR below?

Correct Answer: Option C — aground

Rule 30(d) requires a vessel aground to exhibit the lights for an anchored vessel, plus three all-round red lights in a vertical line and three balls in a vertical line during the day. These signals clearly communicate to other vessels that the ship is immobile and potentially obstructing the channel.