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 ...

You can find where you are using an Ordnance Survey (OS) map. Features such as this information centre are identified on the map using symbols. This is a camping and caravan site. And here's a ...

Symbols added recently by OS to its revised OS Tour Map include solar farms ... geographic features provides the mapping and data for all its leisure and business products and services.