I have driven past this place many times and had thought that it had disappeared. Marked as a mound on the map I had expected to see a lump in the fields, which is definitely not visible.
I decided to take a walk down the little lane anyway and take a look. It is still there and sits nestled in a dip by a stream. One of the things that I noticed straight away was that it is directly between the peaks of Djouce and The Great Sugar Loaf. From the base of the mound, in the dip, you can see neither, but up on the mound you can see both.
From Enniskerry follow the R760 and then the R755 south. After about 2km along the R755 you will be passing The Great Sugar Loaf on the right. Just after you pass a road to the right look out for a track on the left. It is possible to park here. Walk around the track for about 200m and the mound is in a dip to the right.
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.