The flag of Great Britain, commonly known as King's Colours, the first Union Flag, the Union Jack, or the British flag, was used at sea from 1606 and more generally from 1707 to 1801. It was the first flag of Great Britain. It is the precursor to the Union Jack of 1801. The flag consists of the red cross of Saint George, patron saint of England, superimposed on the Saltire of Saint Andrew, patron saint of Scotland. Its correct proportions are 3:5.