Ordnance Survey of Great Britain (OSGB) Coordinate System

Documentation

A guide to coordinate systems in Great Britain (PDF) by Mark Crossley. (You will need the Adobe Acrobat reader to view this document). A brilliant and lucid account of mapping coordinate systems and coordinate transformation, with limpid illustrations. This document is a copy of the downloadable original OS 50000026.pdf that is accessible from the site http://www.aozc64.dsl.pipex.com/Psion/OSGB.html, which also offers an OPL program to convert back and forth from OS National Grid coordinates to longitude/latitude (see below).

The Ordnance Survey of Britain and Conversion of Latitude and Longitude to/from OS References, by Phil Brady.

Tools

Converting tools are available from the following sites:

An online converter from OSGB coordinates to longitude/latitude, by David Harper.

An online converter from longitude/latitude to OSGB coordinates, and from OSGB coordinates to longitude/latitude, by Russ Hore.

A downloadable OPL program that converts back and forth from OS National Grid coordinates to longitude/latitude (written by Mark Crossley) is available from http://www.aozc64.dsl.pipex.com/Psion/OSGB.html.

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	An online converter from OSGB coordinates to longitude/latitude, by David Harper.
	An online converter from longitude/latitude to OSGB coordinates, and from OSGB coordinates to longitude/latitude, by Russ Hore.
	A downloadable OPL program that converts back and forth from OS National Grid coordinates to longitude/latitude (written by Mark Crossley) is available from http://www.aozc64.dsl.pipex.com/Psion/OSGB.html.