This stone took some finding. A new plantation has been planted since the OS map was drawn up and this stone was nearly swallowed up. It is now incorporated into the fence at the edge of the new plantation.
I don't think I've seen a more unusual stone. It looks like a 2m high model of an old New York skyscraper. It is difficult to describe, but it is made up different height rectangular blocks. The trees around it block all the views, but at one time nearby Dyrick Hill would have featured very prominently.
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.