What is the light configuration a vessel RAM must display at night?

A vessel constrained by its draft (RAM) must display a specific light configuration to ensure it is visible to other vessels during nighttime navigation. The correct configuration consists of three lights: a red light at the top, a white light in the middle, and a red light at the bottom, arranged vertically.

This configuration serves several purposes. The two red lights indicate to other vessels that the RAM is restricted in its ability to maneuver due to its draft, which is essential information for any approaching vessels to prevent collisions. The white light positioned between them clarifies the vessel's orientation and movement, providing additional visibility and awareness for other mariners.

The lights are arranged in this specific order—a red light on top, a white light in the center, and another red light at the bottom—to distinctly identify the RAM and differentiate it from other types of vessels, which may have different light arrangements. This helps in reducing confusion during navigation, particularly in crowded or complex waterways.

In contrast, other configurations provided in the options do not represent the correct lighting for a RAM vessel, which is why they are not valid answers.