What is the primary purpose of navigation lights on vessels?

The primary purpose of navigation lights on vessels is to prevent collisions. These lights are essential for maintaining safety on the water, especially during times of low visibility such as at night or in foggy conditions. By displaying specific colors and configurations, navigation lights allow vessels to determine the type, size, and direction of other vessels nearby. This visual communication helps operators understand the relative movement of other vessels, enabling them to make informed decisions to avoid collisions. Each type of vessel is required to show its navigation lights in a standardized manner, contributing to safer navigation in busy waterways.