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 some examples of erosion features identifiable on a map. The shape of the coast is also a good indicator. In this extract the large headlands at Burgh Island, 646438 and Bolt Tail ...