This looks like a great place (from the road). It is clearly supposed to be accessible as there is a sign on the top presumably giving some history of the site. Unfortunately, the field has an electric fence around it, stopping any one getting near it. There is a low bank with a deep ditch surrounding the central mound. This truly is a magnificent specimen of a ring fort.
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Take the N2 North from Dublin and then turn onto the R153 heading west. Take the second right after the junction with the R150 and then take the first left. The ring fort is bout 1.2km along nestled amongst some bungalows.
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.