What is the arc of visibility for a masthead light on a 75 metre vessel?

The arc of visibility for a masthead light on a 75 metre vessel is indeed 225 degrees from right ahead. According to the COLREGs (International Regulations for Preventing Collisions at Sea), a masthead light must be visible from ahead and extend to a significant angle on either side of the vessel. Specifically, it should be visible from an arc of 225 degrees, which allows it to be seen by other vessels in the vicinity, providing important information about the presence and heading of the vessel.

This requirement ensures that other mariners can recognize the vessel's navigation at a safe distance, contributing to overall navigational safety. The forward visibility also includes a direct line of sight right ahead, making it an essential element in preventing collisions, especially in congested waterways. The various answers reflect different ranges of visibility, but the correct one aligns with the specific regulations for masthead lights on vessels of this size.