This is one of those stones that is not on the OS map, because it is hidden by a place name - there is no sign of the huge bold lettering on the field.
The location is a fine one - near to the foot of a north facing slope overlooking the flood plane of the River Suir. The stone is 1.5m or so tall and rather craggy. It is in the grounds of a country estate turned farm, so the views are interupted by rows of ornamental trees. The flood plane below is studded with specimen trees. Nothing could be further from the landscape that must have surrounded the site when the stone was first expected.
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.