This is not an easy site to find and I'm not sure it's really worth the effort. The tomb is in a very sorry state but what does remain is enough to tell you that this would have been an impressive monument if only it had been left alone.
The (possibly double) chamber would have 2.5m wide at the entrance and at least 6m in length, tapering to 1.6m at the rear. One 1.7m entrance stone remains standing in front of the parce chamber stones and a couple of stones to the fore could be from the court, which would have been quite narrow and deep.
Not enough room has been left around this place for it to be seen properly and the grass and reeds are allowed to grow too high. There is no signs of the cairn or its extent.
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.