Which of the following is true regarding navigation lights?

Navigation lights serve a crucial purpose in maritime operations, as they are primarily used for the positioning and identification of vessels. By displaying specific colors and configurations, these lights help operators and other vessels understand each other's location, orientation, and type, especially during nighttime or in conditions of reduced visibility. For example, different types of vessels have different light arrangements, aiding in recognizing whether a vessel is a powerboat, sailing boat, or a fishing vessel.

The correct option highlights the essential function of navigation lights, which is to convey vital information about a vessel’s status to others on the water. This understanding is foundational for ensuring safe navigation and avoiding collisions, as mariners can assess a vessel's heading and nature based on its lights.

While it is true that navigation lights are particularly important during poor visibility, they are not limited to such conditions; they should be used whenever a vessel is underway at night. Additionally, while navigation lights play a role in communication, this is not their primary purpose, which is primarily about positioning and identification. Regarding maintenance, it’s important to regularly check and maintain navigation lights to ensure they are functioning properly, so the last option is not accurate.