DO NOT BOTHER !!! Unless you want your heart to bleed and to despair! This site is an abomination. All that is there is a vaguely round pile of scattered rocks, simply covered in undergrowth. You are much better off going to Rath Gael just down the road.
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From Tullow take the R725 east and take the first left. Pass Rath Gael stone fort and keep looking on the left for a style with a white sign saying "Access To Historic Site". That's it.
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.