Re: GPS to grid reference

On Mon, 30 Jul 2007 16:45:58 +0100, Bernard Hill
<Bernard@xxxxxxxxxxxxxx> wrote:

What's a "datum"? Is the L/Long not unique in converting to OSGB?
No. Lat/Long is not unique. The position
N50°00.0000' W001°00.0000' (in WGS84 datum)
is exactly the same position as
N49°59.9647' W000°59.9126' (in Ord Srvy Grt Britn datum)

See a layman's (non-technical) explanation of datums at
http://www.gpsu.co.uk/datums.html

Alan Murphy
.