Final answer:
A vessel restricted in her ability to maneuver when making way must display three vertical lights—red, white, red—as well as the usual masthead light, sidelights, and a stern light. During the day, it should display three shapes in a vertical line—a ball, a diamond, and a ball.
Step-by-step explanation:
The question pertains to the navigation lights and shapes required to be displayed by a vessel that is restricted in her ability to manoeuvre (RAM) as per the International Regulations for Preventing Collisions at Sea (COLREGs). When making way through the water, such a vessel must exhibit:
- Three all-round lights in a vertical line where they can best be seen. The highest and lowest of these lights are red and the middle light is white.
- A masthead light forward.
- Side lights.
- A stern light.
By day, it must exhibit three shapes: a ball, a diamond, and a ball in a vertical line. This light and shape configuration alerts other vessels that the vessel is restricted in her ability to maneuver and that they should navigate with caution around her.