What is the primary purpose of navigation lights on boats?

The primary purpose of navigation lights on boats is to ensure visibility and safety at night. These lights serve crucial functions in helping boat operators identify their vessel's position and heading, especially in low-light conditions or during inclement weather. By adhering to the specific colors and arrangements of navigation lights, boaters can communicate their actions to other vessels, thereby reducing the risk of collisions and enhancing overall safety on the water.

In contrast, the other options do not capture the essential role of navigation lights. Looking good might be a perception but does not reflect their functional importance. Signaling the location of fish is not an intended purpose of navigation lights, which are specifically focused on vessel visibility rather than wildlife communication. While nighttime fishing is a common activity, it is not the primary function of navigation lights; instead, those engaged in such activities must rely on appropriate lighting for safety and navigation.