Can anyone point at a tutorial for calculating the grid reference from lat long.
I have lat and long coordinates from a gps tracker but I need a way to convert them to grid reference norths and eastings.
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Do you mean UTM Grid? There are many differnet grid coordinate reference systems – AlexWien Aug 08 '13 at 14:30
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Yes Sorry I did mean UTM, thanks I missed that off – Barry Connolly Aug 08 '13 at 14:32
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If you want to convert from latitude, longitude based on WGS84, which is the default for GPS chips, to UTM WGS84 the you can find opens source software for that task.: search for WGS84 to UTM conversion) or use this: Open source PHP function for converting UTM coordinates to latitude and longtitude?
If you need advanced conversions like, convert to UTM which is not based on WGS84 like UTM ED50 (Italy) or UTM NAD27 (USA), then you need a professional coordinate transformation library.
