During the day, what signal is used by an anchored vessel?

An anchored vessel is required to display a specific signal during the day to indicate that it is not under way and is instead anchored. The correct signal for an anchored vessel is one black ball. This visual marker serves a critical purpose in maritime safety, helping other vessels recognize that the anchored vessel is stationary and allowing them to navigate safely around it.

Displaying one black ball provides clear visibility and communicates the status of the vessel to other mariners, aiding in the prevention of collisions. The use of this signal is established in the International Regulations for Preventing Collisions at Sea (COLREGs), where specific shapes and colors are designated for various status indications of vessels.

The other options, while potentially relevant in different contexts, do not correspond to the signal required for an anchored vessel during the day. Thus, understanding why one black ball is the appropriate choice helps reinforce knowledge of maritime signaling and safety protocols.