This stone has so much going for it. It is, for one, quite large. It has also definitely been worked to provide a flat edge. The owner of the house that adjoins the stone has carefully cleared some moss to expose a definite cut mark across the base of the stone. There is a large shoulder at ground level indicating that the stone was put in place and then worked. He is convinced that the worked face aligns to the sun rise on the summer solstice.
It is also made all the more better because it is right next to a stream and very close to a junction of two streams. Well worth checking out.
Take the N81 south from Dublin. The stone is in a field just before the second left turn after the junction with the R412. It is actually easier to access the stone via the garden of the house on the junction and the owner is quite proud of his stone.
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.