Whilst reading up on Carrowkeel I'd often read about and seen pictures of this cist , but due to appalling visibility each time I've been here, and also due to not remembering which [glos:cairn[ it was next to, I'd not seen it until now.
It's pretty big. Over 2m long and 1.5m wide and it was no surprise to find that its long axis points straight at Maeve's Cairn (County Sligo)!
To find it, if you are walking up the hill from the north it is about 30m to the left of cairn K.
There are two kinds of burial chamber that are refered to as cists or kists. Kist is usually used to refer to a megalithic structure and cist used for later Bronze Age burials.
Cists are small slab lined boxes, set into the ground, with a single slab used as a cover. They tend to be no larger than 1.5m square. Although cists are found in dedicated mounds or cairns they are often later insertions into megalithic cairns (see Kilmashogue (County Dublin)).
Kists are much bigger structures and usually built above ground level (see Dolmen of the Four Maols (County Mayo))and covered by a cairn. They are usually rectangular in plan with vertical sides, but one type, known as a Linkardstown Kist is pentagonal with sloping side stones (see Cloghtogle (County Fermanagh)).
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.