What does a masthead light on a vessel do?

A masthead light on a vessel is designed to shine forward, providing an essential signal to other boats regarding the presence and direction of the vessel. It is typically located at the top of the mast and helps to indicate the vessel's position to others navigating nearby, especially during nighttime or in conditions of reduced visibility. This light is crucial for safety, as it allows other mariners to determine the heading of the vessel and avoid potential collisions. The forward light distinguishes the direction the vessel is facing, which is vital for understanding navigation rules and ensuring safe passage on the water.