What is the degree coverage for a stern light?

A stern light provides a specific coverage that is crucial for ensuring visibility and safety at sea. The standard degree coverage for a stern light is 135 degrees, which means it illuminates an area extending 67.5 degrees on either side of the centerline of the vessel at the stern. This coverage is designed to let other vessels know the position and orientation of the vessel from behind, as the stern light is positioned at the rear of a boat or ship.

Having this 135-degree coverage allows for sufficient visibility for approaching vessels to determine the presence and course of the vessel equipped with the stern light. It is important to adhere to this standard to maintain safe navigation, as correctly positioned lighting aids in collision avoidance, especially during nighttime or low-visibility conditions.