The Open Guide to London: the free London guide - Differences between Version 2 and Version 1 of Coordinate System

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Geographical coordinate system are hard.

OS X and OS Y coordinates have a number of translations into latitude and longitude, using different 'ellipsoids'.

The convert tool [http://london.openguides.org/convert-coords.cgi|convert-coords.cgi] in the past used the "Airy" projection, and is now using the WGS-84.

Most GPS systems use WGS-84.

Most online mapping systems use WGS-84.