What a way to finish the day! A walk across peat bog, crossing deep drainage ditched and barbed wire fences - Yes, once again I chose the wrong way to approach a monument! Do not come from the southwest, but take the track from the north instead!
The monument itself is set in a beautiful location on an east-facing slope overlooking a wide, shallow valley. The chamber and portal stones have collapsed and the large 4m x 4m capstone rests on top of the resulting pile. You can see where one of the portal stones has simple broken in two under the weight of the capstone.
To the south side of the chamber there is a small enclosure, which is probably modern(ish), set into the remains of a round cairn that surrounds the portal tomb itself. Below the monument, close to a wall, are several slabs which could be the remains of a cist or a second portal tomb, but could just be some coincidental slabs.
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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.