What is the arc of visibility for a masthead light?

The arc of visibility for a masthead light is indeed 225 degrees. This light is typically mounted on the front or top of the vessel and is required to be visible from the front and to the sides, making it crucial for navigation and collision avoidance during nighttime or low-visibility conditions. The 225-degree arc means that it is visible from the front of the vessel (which may be defined as 112.5 degrees to either side of the centerline) and extends further to the rear, creating a broader area of visibility. This design helps ensure that vessels are seen from a significant distance by other maritime traffic, contributing to maritime safety.