What is the minimum visibility range for a mast light on a vessel under 12 meters in length?

The minimum visibility range for a mast light on a vessel under 12 meters in length is indeed 2 miles. This requirement is outlined in the International Regulations for Preventing Collisions at Sea (COLREGs), specifically in the rules governing the navigation lights and shapes that vessels must display.

For smaller vessels, such as those under 12 meters (approximately 39.4 feet), the regulations specify that the masthead light must be visible from a distance of at least 2 miles. This visibility range is crucial for ensuring that these smaller vessels can be seen by others, enhancing safety, particularly at night or in reduced visibility conditions.

This requirement is in place to help prevent collisions at sea, allowing other vessels to recognize the presence and orientation of smaller craft in a timely manner. By adhering to this standard, vessels help maintain safe navigation practices on the water.