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Ordnance Survey – Great Britain's national mapping agency

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About us
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  - Freedom of information

Freedom of information

Classes of information

Guidance materials

Documents in this class (including additional information, formats and pricing where applicable)

Guidance about the numbering of 6 inch to 1 mile and 1:2500 scale County Series maps HTML

Guidance – calculating the distance between two points using their National Grid references HTML

Map reading made easy PDF

Grid north, magnetic north and true north HTML

The National Grid – our unique reference system. HTML

Surveying and mapping HTML

Information paper on improvements to our detailed topographic specification HTML, PDF

Guidance notes in relation to rights of way and associated topics HTML