I am not 100% sure that this is the remains of one of the recorded cairns or not. It seems to fit the description, but I don't know. An arc of stones that poke above the low heather could represent the kerb of a robbed away cairn. Alternatively they could be either nothing or a stone circle.
To the south of this group of stones there are several others that look as if they could be tangential alignments to the circle. Is there more to this place than meets the eye? Almost certainly. The fact that a forestry track has destroyed one side of this site could make it a good candidate for excavation.
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.