The grave stone (S 828 796) is a most curious thing. I didn't see it the first time I walked past it and so ended up going to the rath (S 831 796) first.
The rath (fortified settlement) is nothing special except for the views offered.
The grave slab however is incredible. What is most perplexing is its location built into a dry stone wall. I think there must have been a church or something here in the past. It was not until I got the photos back that I noticed some writing on the foot of the sarcophagus.
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From Tullow follow the R418 north past the junction with the R726. Take the next right and drive right up to the house at the far end. Walk through the gate to the right and follow the farm track to a little enclosure. The rath can clearly be seen on the ridge if the field is not planted.
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.