What is a typical night lighting arrangement for a vessel underway?

• A. Navigation lights indicating presence and status (sidelights and stern light).
• B. A white beacon with no other lights.
• C. No lights are required.
• D. Rotating red beacon only.

Answer: (A)

At night, a vessel underway must display a standard set of navigation lights so others can see it and understand its presence and behavior on the water. The typical arrangement includes red and green sidelights to show port and starboard, plus white forward and aft lights (masthead and stern) so the direction the vessel is moving is clear. This configuration lets other mariners judge where the vessel is, how it’s heading, and how close it might be, which is essential for preventing collisions. The option that describes navigation lights signaling presence and status matches this purpose exactly. The other choices fall short: a single white beacon with no other lights doesn’t convey position or movement; no lights at all leaves the vessel invisible at night; and a rotating red beacon alone does not provide the standard navigation signals required for a vessel underway.