'Ballygroll 7' : Cist

TownlandBallygroll
CountyDerry
Grid RefC 533 137
GPSC 53330 13663 (7m)
Longitude7° 10' 2" W
Latitude54° 58' 3.45" N
ITM east480366
ITM north584435
Nearest TownClaudy (6.4 Km)
OS Sheet7
UTM zone29U
UTM x449041
UTM y5761192

This is a subsite of:

Ballygroll Prehistoric Complex - Megalithic Complex
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Visit Notes

Sunday, 29th October 2006

This one took some finding. It is next to a small tree 8m to the right of the track that leads to the stone circles. There is no track leading to it and it is becoming very overgrown.

The chamber only has two walls left in place. These are about 1.5m long and 50cm high. The chamber is very narrow, just 50cm or so. It aligns roughly east-west.

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About Coordinates Displayed

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.

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