Lights

Lights, Ships', the lanterns carried by ships in order to indicate their nature and movements to other ships at night. A starboard light (green) and a port light (red) are ordered to be carried by all ships when under weigh, and to be so screened as to throw their beams from right ahead to two points abaft the beam. They should be sufficiently powerful to be visible from a distance of two miles. A steamer under weigh carries a masthead light which throws its beams from right ahead to two points abaft the beam on each side, and which should be visible in clear weather from a distance of five miles. A steamship towing another ship carries two bright white masthead lights disposed vertically, in addition to side-lights. A ship being towed carries side-lights only. Sailing pilot vessels carry a white masthead light visible all round, and also exhibit a flare-up light every fifteen minutes. Fishing vessels and boats at anchor exhibit a bright white light. Boats fishing with drift nets carry on one of their masts two lights, one three feet above the other.