GPS - the global open standard - use latitude and longitude. to identify a point.
Ordnance Survey Maps use their own systen. The points (e.g. TZ123456), or sometimes given at 6 figure easting and northings (e.g. 123456,123456) while user friendly, and easy to locate on the grid superimposed on OS maps, can't easily be be used by satnavs.
The maps to convert between the 2 systems is rather comples, but we can do it for you..
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