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Ordnance Survey – Great Britain's national mapping agency

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- OS Net
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Coordinate transformer

To use the online Coordinate transformer facility, please select the your region of operation and then click 'Proceed':

To obtain a free Windows version of the coordinate transformer to install on your own PC, click here.

Developers - for information on how to obtain OSTN02 and OSGM02 for incorporation into your own software, click here.