What is the visibility range of a masthead light?

The visibility range of a masthead light is correctly identified as extending from dead ahead to 112.5 degrees to both port and starboard. This specific range is key for ensuring that vessels can be seen and identified by others when navigating, particularly at night or during conditions of reduced visibility.

The masthead light, which is mounted high on the vessel (usually at the top of the mast), serves the important function of indicating the presence and direction of the vessel to other mariners. The forward visibility of the masthead light is designed to encompass a substantial area directly ahead and off to the sides, which aids in collision avoidance. This 225-degree arc of visibility is critical for safe navigation, allowing vessels approaching from the front or the sides to discern the orientation of the vessel displaying the light.

Consideration of the other options reveals why they do not accurately describe the visibility range of a masthead light. The first option, which suggests a visibility from 90 degrees to port and starboard, does not encompass the crucial area directly ahead. The third option, indicating a full 360 degrees, is also incorrect because a masthead light does not shine to the rear or in all directions, but is specifically aimed forward. Lastly, the fourth option inaccur