In the UK, locations may be encoded as Ordinance Survey map references (I've heard of people using OS references as addresses). It is what most geo databases in the UK were keyed on, until a few years ago.
The OS uses a different datum to the GPS system, so if you convert to lat/lon you'll be out by about 150 metres (where I am, at least). You need to re-project the coordinates onto the other datum to get the real location.
The OS uses a different datum to the GPS system, so if you convert to lat/lon you'll be out by about 150 metres (where I am, at least). You need to re-project the coordinates onto the other datum to get the real location.