Each OS map has a key to show what the symbols mean. Large-scale maps - 1:1,250, 1:2,500 and 1:10,000. Features appear larger on the map. This may be used for individual towns and cities.

Just like a key to a door, the key helps you to unlock the information stored in the colours and symbols on a map ... The key below is taken from an OS map. This will help you interpret the ...