Other Implementations and Sites
- Russ Hore has provided an online web convertor which does latitude and longitude to OS reference at http://www.russ-hore.co.uk/ Note that latitude and longitude are with reference to the Ordnance Survey 1936 datum.
- David Harper has lots of interesting astronomical data at http://www.obliquity.com including a web based OS reference to latitude and longitude converter at http://www.obliquity.com/astro/osgb.html and a distance and azimuth calculator at http://www.obliquity.com/astro/distance.html
- http://www.streetmap.co.uk/ does conversions of UK postcodes, OS references and Latitude/Longitude and shows a map. Essential if you travel often.