What is the minimum range of a masthead light on a vessel that measures 15 meters?

The correct answer is based on the definitions established in the COLREGs (International Regulations for Preventing Collisions at Sea). For vessels that measure between 12 meters and 50 meters in length, the minimum range for a masthead light is set at 3 nautical miles.

Masthead lights are white lights placed at the fore part of a vessel and are visible from a distance. Their primary purpose is to indicate the presence and heading of the vessel to other vessels. This distance requirement helps ensure that the vessel can be seen in time to avoid collisions, particularly in maritime traffic areas.

In this case, a vessel measuring 15 meters falls within the specified range of 12 to 50 meters, thus requiring a masthead light with a minimum visibility range of 3 nautical miles. This standard is crucial for improving safety and navigation at sea.