Finding this was fun - but with an anti-climax. The coordinates that I had for it were some 50m out and it appeared that we needed to penetrate a dense thorn hedge to reach it. As I got to the top corner of the field I peered into the hedgerow and there it was!
It is actually in the hedge where the four fields meet and almost invisible. This is a real shame as it looks like a very nice stone. It is very slender, about 2m tall and rises nicely to a point. Shame you can't see it.
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This is an explanation of (and a bit of a disclaimer for) the coordinates I provide.
Where a GPS figure is given this is the master for all other coordinates. According to my Garmin these are quite accurate.
Where there is no GPS figure the 6 figure grid reference is master for the others. This may not be very accurate as it could have come from the OS maps and could have been read by eye. Consequently, all other cordinates are going to have inaccuracies.
The calculation of Longitude and Latitude uses an algorithm that is not 100% accurate. The long/lat figures are used as a basis for calculating the UTM & ITM coordinates. Consequently, UTM & ITM coordinates are slightly out.
UTM is a global coordinate system - Universal Transverse Mercator - that is at the core of the GPS system.
ITM is the new coordinate system - Irish Transverse Mercator - that is more accurate and more GPS friendly than the Irish Grid Reference system. This will be used on the next generation of Irish OS maps.