What is the lighting requirement for a power vessel less than 39 feet in length?

A power vessel less than 39 feet in length is required to meet specific lighting regulations to ensure visibility and safety while underway. The combination of a masthead light and a sternlight is crucial because the masthead light, which is white and positioned at the front of the vessel, indicates the vessel's heading and provides visibility to others. The sternlight, which is also white but located at the rear, helps others recognize the vessel's position from behind.

This combination allows other vessels to assess the size and direction of the smaller power vessel effectively, contributing to safe navigation. The requirement not only helps in avoiding collisions but also adheres to maritime regulations that aim to standardize vessel lighting for safety on the water.

In contrast, not displaying lights, only using a sternlight, or having an all-round green light would not provide the necessary information to other vessels about the power vessel's intentions and direction, creating potential hazards on the water. Thus, the requirement to have both a masthead light and a sternlight is essential for compliance and safety.