Article 15U.K.Rules for end marker buoys
1.End marker buoys shall be deployed so that each end of the gear may be determined at any time.
2.The mast of each end marker buoy shall have a height of at least 1 metre above the sea level measured from the top of the float to the lower edge of the bottom most flag.
3.End marker buoys shall be coloured, but may not be red or green.
4.Each end marker buoy shall include:
(a)one or two rectangular flag(s); where two flags are required on the same buoy, the distance between them shall be at least 20 centimetres flags indicating the extremities of the same gear shall be of the same colour and may not be white and shall be of the same size;
(b)one or two light(s), which shall be yellow and give one flash each 5 seconds (F1 Y 5s), and be visible from a minimum distance of 2 nautical miles.
5.Each end marker buoy may include a top sign on the top of the buoy with one or two striped luminous bands which shall be neither red nor green and shall be at least 6 centimetres broad.