Navigation lights are essential for visibility and safety, particularly during night-time or in low-visibility conditions. Testing and servicing the system involves checking the functionality of the lights, cables, and electrical connections. It includes inspecting the light sources for any signs of wear, replacing faulty bulbs, and ensuring that all lights are operational and positioned correctly. A well-maintained navigation light system ensures that the vessel remains visible to others and complies with maritime regulations. Regular service reduces the risk of accidents and ensures visibility under various weather conditions.