This is a monument I've tried to see before, but have never managed to find it. It is visible from the road if you know where to look, but the farm track marked on the OS map is somewhat misleading as it actually goes through someones driveway.
The monument is very ruined, but you can make out both chambers of this double portal tomb. The chambers are on a roughly east-west axis with the larger one at the east end. The smaller chamber is very disturbed with probably only one stone still in situ. The main chamber has collapsed into a heap and none of the stones appear to be standing. You can, however, identify the two portal stones and the stone that was probably the capstone. The portal stones could have stood over 2m tall.
This monument is at the west end of the valley, and so has a very good view to the sea and eastwards up the valley. Not many of the other tombs are directly visible from the location due to the lay of the land.
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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.