Originally Posted by
jimjim1
In the UK the best maps (not aviation or marine) use a local co-ordinate system that dates from 1936.
https://en.wikipedia.org/wiki/Ordnan..._National_Grid. Must have seemed a good idea at the time. The maps were created for military purposes originally. Google Maps does not understand it at all:-) The maps though are very good.
And, not WGS84 compliant.