Which light configuration is displayed by a vessel that is restricted in its ability to maneuver?

The light configuration displayed by a vessel that is restricted in its ability to maneuver involves three all-round lights: an upper red light, a middle white light, and a lower red light. This specific arrangement serves to indicate that the vessel is unable to engage in normal navigation due to operational limitations, such as when it is conducting underwater work or has a draft that restricts movement.

The upper red light signifies the "restricted in ability to maneuver" status and is crucial for other vessels to understand the limitations of the one displaying it. The middle white light indicates that the vessel is under certain conditions and the lower red light reinforces the visibility and recognition of the vessel's special status on the water. This configuration is essential for ensuring safe navigation and is designed to alert surrounding vessels to the situation, thereby minimizing risks and collisions.

Understanding this arrangement is important for maintaining safety on the water, as it directly communicates the vessel's capabilities to other mariners.