BOTH INTERNATIONAL & INLAND You are underway at night and you sight the lights shown in illustration D047RR below. You know these lights indicate which of the following?

Correct Answer: Option A — sailing vessel

Rule 25(a) states that a sailing vessel under sail shall exhibit sidelights and a sternlight. These lights indicate a vessel propelled by wind, which is not using its machinery for propulsion. The absence of masthead lights distinguishes this configuration from a power-driven vessel or a vessel engaged in fishing.