Question 714 Rules of the Road

The correct answer is A) one all-round white light. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a vessel at anchor is required to display an all-round white light. This is specified in Rule 30(a) of the COLREGS, which states that "a vessel at anchor shall exhibit an all-round white light where it can best be seen." The other options are incorrect because displaying sidelights and a stern light (choice C) is the requirement for a vessel underway, not a vessel at anchor. Showing two all-round white lights (choice D) is the requirement for a vessel aground, not a vessel at anchor. Showing both an all-round white light and sidelights (choice B) is not the correct requirement for a vessel at anchor.