What type of lights must a boat that is less than 40 feet long have?

A boat that is less than 40 feet long must display red and green side lights along with an all-round mast light. This configuration is crucial for safety and visibility on the water, as it helps other vessels identify the boat's direction and position during both day and night.

The red and green side lights indicate the port and starboard sides of the vessel, enabling other boats to determine the boat's orientation. The all-round mast light serves as an indication of the boat's presence from any direction, enhancing visibility in various conditions.

This specific lighting arrangement meets the requirements set by maritime regulations for smaller vessels and is essential for avoiding collisions, especially at night or during periods of low visibility. Understanding and adhering to these lighting rules is vital for safe navigation and compliance with the law.