BOTH INTERNATIONAL & INLAND Which lights is a vessel not under command, underway but not making way, required to exhibit?

Correct Answer: Option A — two all-round red lights in a vertical line

Rule 27(a)(i) mandates that a vessel not under command shall exhibit two all-round red lights in a vertical line. While these lights are required at all times, sidelights and a stern light are only exhibited when the vessel is making way through the water.