Coordinate System
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.
Last edited 2005-11-28 20:41:05
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