When I finally found this tomb I was not surprised that I'd failed on two previous attempts. The official coordinates are 75m out and that's a long way in a pine plantation where you can only see 20m in front of you.
The monument is delightful. So good, in fact, that the very small area set aside for it in the plantation only detracts from the site by a small amount.
The structure is almost complete. The 5m long gallery has two large, very slightly displaced roofstones. There is a portico at the SW end of the gallery and the whole is edged by a U-shaped kerb. The inner-forest location has led to all the stones getting a thick coating of loose moss. Several trees erupt from amongst the stones, but these have all died. This means that they are no longer causing damage to the structure, but when they fall they could displodge some of the stones: they should be carefully removed before this happens.
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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.