OS maps show physical and human features as symbols. This makes the maps easier to read. 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.

Here are the steps you should follow to produce a six-figure grid reference: Use an Ordnance Survey (OS) map to work out the distance between two points. For example, how far is it between the ...