If an anchored vessel is greater than 50 meters, what must it show?

Answer: A — second all-around light

When a vessel that is greater than 50 meters in length is at anchor, it is required to display a second all-around light in addition to the first. This requirement is established to enhance the visibility of larger vessels, ensuring they are easily distinguishable to other vessels in the area. The use of a second all-around light on these vessels provides a clear signal of their presence, contributing to safety and navigation in crowded maritime environments. It helps prevent collisions by making the anchored vessel more visible to approaching ships, especially in conditions where visibility might be reduced. In contrast, the other options do not meet the regulatory standards specified for anchored vessels of this size. The first all-around light alone does not suffice, nor do flashing white lights or hourly sound signals provide the necessary indication of an anchored status. Sound signals may be required in some circumstances, but they do not replace the need for proper lighting as indicated for larger anchored vessels.