From the road I just could not work out what this stone was going to look like. It seemed to be a very odd shape indeed. When I reached the stone I could see why: there is an OS trig point right next to it and from the road this looked as if it was part of the stone.
After so many small stone recently I was surprised at the size of this one. It is 2m tall and 1.5m wide at the top. The base is narrower. It is a slab about 40cm thick. Being so high up (relative to the surrounding land that is) the views are quite good, especially to the northeast.
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.