(1) Mast top:No. light is placed above the mast of the ship or above the centerline of the bow and stern, and it displays uninterrupted light in a horizontal arc of 225 degrees. Its device should make the light display in the range of 22.5 degrees from the front of the ship to the rear of each side.
(2) Side lights: the red light on the port side and the green light on the starboard side are respectively placed on the left and right sides of the highest deck of the ship, and in the horizontal arc of 1 12.5 degrees from the bow to the stern, uninterrupted lights are respectively displayed. The device should display the lights in the range of 22.5 degrees from the bow to the back of the ship's rail.
(3) Taillight: white light placed in the center of the stern. Uninterrupted lights should be displayed in the horizontal arc of 135 degrees, and the device should display the lights in the range of 67.5 degrees from the right rear of the ship to each side. The height of mast light should be as flush as possible with the side light, but it should not be higher than the side light.
Use signal lights in other situations.
(1) Anchor timing: Only the anchor light (white ring light) is displayed.
(2) Out-of-control ship: In addition to the side lights and tail lights (which are turned off when not moving with the water), two vertical red lights should be displayed in the most conspicuous place.
(3) Ships with limited draught: In addition to side lights, tail lights and masthead lights, three vertical red lights must be displayed in the most conspicuous place.
Extended data
Ship signal lights are divided into two types according to their uses: navigation lights and general signal lights. The turn-on and turn-off time of 1 light is generally defined by sunset and sunrise. For navigation lights, the relevant rules stipulate that they should be turned on at any time, even during the day, in the case of poor visibility.
According to international rules, the number of navigation lights varies according to the size and length of the ship. Ships over 50 meters in length should be equipped with five navigation lights, namely, front mast light, rear mast light, rear stern light and port and starboard lights.
Baidu Encyclopedia-Ship Signal and VHF Communication