What is the primary purpose of using navigation lights on a vessel?

The primary purpose of using navigation lights on a vessel is to alert other boats of the vessel's presence and direction. These lights play a crucial role in ensuring safety on the water, particularly during nighttime or in conditions of reduced visibility, such as fog or rain. By displaying specific colors and configurations of lights, vessels convey important information about their size, type, and whether they are underway or at anchor.

For instance, a red light indicates the port side of the vessel, while a green light indicates the starboard side. A white light indicates the stern. This signaling is vital for avoiding collisions and maintaining safe distances between vessels. Properly functioning navigation lights are therefore essential for maritime safety and navigation, ensuring that all vessels can see and interpret each other's movements on the water.