1. Masthead-One white, constant-beam lamp, mounted on the foremast at least one meter above the bridge; if the ship has no foremast, it shall be mounted on a fixed lamp holder above the bridge. The light shall be directed at 112.30 degrees to each side from directly forward of the bow, and the light intensity shall be clearly visible at least three kilometers away on a clear, dark night.
2. Sidelights-One red, constant-beam lamp on the port side and one green, constant-beam lamp on the starboard side. The light shall be directed at 112.30 degrees to each side aft of the ship's waist from directly forward of the bow, and the light intensity shall be clearly visible at least two kilometers away on a clear, dark night. The installation of the red and green sidelights on both sides shall be fitted with a shield parallel to the keel, extending at least 0.6 meters forward from the filament, and a baffle, the width of which shall be equal to the distance between the filament and the baffle, shall be installed at the forward end of the shield, so that the lights on one side of the ship are not visible from the other.
3. Stern Light – One constant white masthead lamp shall be hung at the stern, its light illuminating 67.30 degrees to each side from directly behind the vessel. The light intensity shall be clearly visible from at least two kilometers away on a clear, dark night.
In addition to the lights for single-vessel operation, tugboats shall also display the following lights for different modes of operation:
1. When tugboats are in a convoy, one white masthead lamp, identical to that, shall be displayed, with a vertical distance of not less than 0.6 meters between the two lamps.
2. When tugboats are towing or pushing vessels, one green constant-beam masthead lamp and one white constant-beam masthead lamp shall be displayed, the three lamps suspended vertically (white lamps above and below, green lamp in the middle), the lowest lamp being one meter above the bridge, with a distance of not less than 0.6 meters between them.
3. When towed in a single convoy, a white light of the same specifications as the stern light, one meter higher than the stern light, should be hung behind the funnel to facilitate steering of the towed vessel.
When a barge is lashed or hoisted, it shall hang side lights and stern lights as stipulated; when being pushed, only the outermost light may be hung. When two or more barges are lined up side by side, only the green side light shall be hung on the starboard side of the outermost barge on the right, and the red side light on the port side of the outermost barge on the left.
When a ship is towed, lashed, or pushed, it shall also hang lights according to these regulations, but the tugboat's own red and green side lights shall not be omitted due to the lashing of the barge.
When ships and barges are moored or anchored in the river, on the shore, or at a wharf, they shall hang the following signals:
1. During the day, a black ball must be hung conspicuously on the bow (this is waived when docked at a wharf).
2. At night, a white, fixed-beam all-around anchor light must be hung in a prominent position at the bow, with a light intensity that is clearly visible from at least two kilometers away on a clear, dark night. If the ship is moored with mooring lines that create a distance between the ship and the shore when approaching the shore, a red all-around anchor light must be hung on the mooring lines at night; and a red flag must be hung on the mooring lines during the day.
