This standing stone is located at not quite the highest point on the island. It is surrounded by tall marram grass and so it is quite difficult to spot until you're nearly at the stone. It is a little over 1m tall. There is a second stone lying at the foot of the standing one, so this may well have been a stone pair. The erect stone is local rock, but the prostrate one is a conglomerate, which is not native to the area.
There is a fine view out to see here and inland you are dominated by Benbulben Mountain.
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.