BOTH INTERNATIONAL & INLAND You are on watch and sight a vessel showing only the lights in illustration D059RR below. What type of vessel do these lights represent?

Correct Answer: Option B — power-driven vessel

Rule 23 requires a power-driven vessel underway to exhibit a masthead light forward, sidelights, and a stern light. Illustration D059RR displays this configuration. These lights identify the vessel as a power-driven craft, distinguishing it from sailing vessels, fishing vessels, or those restricted by their maneuverability under the COLREGS.