Ordnance Survey – Great Britain's national mapping agency
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.
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Ordnance Survey is Great Britain's national mapping agency, providing the most accurate and up-to-date geographic data, relied on by government, business and individuals.
Ordnance Survey © Crown copyright 2007