Which light is used for signaling a boat under sail?

The masthead light is used for signaling a boat under sail because it is specifically designed to indicate the presence and direction of a sailing vessel at night or during low visibility conditions. This light is typically positioned high on the mast and emits a white light that is visible from all directions. Its purpose is to inform other vessels of the sailboat's position and orientation as it sails.

Understanding the function of the masthead light is essential for safe navigation and ensuring that the sailboat is easily identifiable to others on the water. The illumination from a masthead light indicates whether the vessel is at anchor or underway. Moreover, the masthead light is part of the required navigation lights for sailing vessels, adhering to the International Regulations for Preventing Collisions at Sea (COLREGs).

The other types of lights mentioned, such as blinking lights, deck lights, and anchor lights, serve different purposes. Blinking lights might be used for specific signaling but are not standard for indicating a sailing vessel's status. Deck lights illuminate the area on the boat but do not serve a navigational purpose. Anchor lights are used exclusively to signal when the boat is anchored, not when it is under sail. Thus, the masthead light is the appropriate choice for signaling a