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Hello
A simple question - what is the formulae for transforming GPS coords to UK
national Coords (via Lat and Long opresumably)?  I'm not concerned about long
base lines or plate tectonic movements (1-3cm changes in Europe per year) but
do need to covert  GPS 'centre of earth' coordinates back to UK (Transverse
Mercator) national grid 6 figure references.
 
Many thanks.   John