A bit of a disappointment really as this is just a possible cross site and wouldn't normally be marked on the OS.
I have only included it because there is a planning application to build a dwelling here that involves relocating this monument.
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Take the N81 and then the N82 from Dublin. When you reach Saggart turn left at the cross roads and then the right fork after 600m. Continue for 1.8km and take the first right and then first left. The cross site is about 1.2km along on the left but very difficult to see.
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.