Question 563 Rules of the Road

The correct answer is B) anchor lights. According to the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules, a vessel aground at night must display two red lights in a vertical line in addition to her normal navigation lights, which include sidelights and a stern light. These two red lights in a vertical line indicate that the vessel is at anchor, as per Rule 30 of the COLREGS and the corresponding Inland Navigation Rule. The other options are incorrect because sidelights and a stern light (A) are the normal navigation lights required, not an additional requirement for a vessel aground. Options C and D describe different light configurations for vessels not under command and restricted in their ability to maneuver, respectively, which do not apply to a vessel aground.