This is a strange site. From the road you can see a great slab standing on end on a small rise in the field. When you reach this rise you can then see the rest of the wedge tomb lying in some holly trees at the rear of the field.
The upright slab would appear to be the erected roof slab from the tomb, which is about 3m in length.
The tomb shows signs of a small portico, but as it is right up against the fence it is quite difficult to be sure.
On a mound just 50m away is the ruins of another wedge tomb.
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.