Great Britain (including Channel Is. & Isle of Man)
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Please note that use of the Co-ordinate Converter API is free for non-commercial purposes only. If you wish to use it for a commercial application please contact me for details and pricing. Usage of the Co-ordinate Converter API is monitored.
Co-ordinate Converter grew out of a practical need to convert between the projection co-ordinates used to construct Ordnance Survey small-scale maps of Great Britain from the early 20th century and the modern-day GB National Grid.
It began life in the Summer of 2004 as a very simple piece of software - written in Visual Basic - allowing three-way conversion between OS Latitude/Longitude, GB National Grid and Cassini (Delamere) co-ordinates. From there the software grew to include support for conversions to/from other projected co-ordinate systems commonly in use in Great Britain and Ireland.
In November 2007 the County Series sheet references for Great Britain and the Isle of Man were incorporated into the software, introducing a new level of versatility to Co-ordinate Converter.
Between December 2008 and April 2009 the software version was ported to the current web-based version, including support for additional co-ordinate systems, and for the first time conversion to/from GPS-compatible latitude/longitude for Great Britain and Ireland. Details can be found in the Co-ordinate Converter Version History.
Please note that the downloadable standalone version of Co-ordinate Converter is currently not available pending a completely revised version (no release date has yet been set).
Co-ordinate Converter is copyright © 2004-2009 Ed Fielden.
You may use Co-ordinate Converter for non-commercial use only, except by prior agreement.
While great care has been taken in development and testing, the results of transformations provided by Co-ordinate Converter should not be relied upon for critical applications. No liability can be accepted for any loss or damage - direct or consequential - arising from the use of Co-ordinate Converter.
Page last updated: 24 April 2012