A double tier navigation light is a specialized marine lighting fixture that typically consists of two sets of lights stacked vertically. These lights are used to indicate the presence and direction of a vessel, ensuring safe navigation and compliance with maritime regulations. Here are some key features and benefits:

1. Dual Light Configuration: The double tier design allows for multiple light sources, enhancing visibility and indicating different navigation statuses (e.g., port and starboard).

2. Color Coding: Usually incorporates red and green lights to represent port (left) and starboard (right) sides of the vessel, respectively. Some configurations may also include white lights for masthead signals.

3. Durable Construction: Made from corrosion-resistant materials, such as stainless steel or marine-grade plastics, to withstand harsh marine environments.

4. Visibility Range: Designed to be visible from a significant distance, ensuring other vessels can easily identify the ship's position and direction.

5. Compliance with Regulations: Meets international maritime standards (e.g., COLREGs) for navigation lights, ensuring safe operation at sea.