Greatheath : Ring Fort

CountyLaois
Grid RefN 525 010
GPSN 52460 01049 (3m)
Longitude7° 13' 2.97" W
Latitude53° 3' 27.16" N
ITM east480366
ITM north584435
Nearest TownPortlaoise (6.3 Km)
OS Sheet55
UTM zone29U
UTM x449041
UTM y5761192

This is a subsite of:

The Great Heath - Greatheath - Barrow Cemetery
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Visit Notes

Sunday, 11th April 2010

When is a ringfort not a ringfort? When it's half a ringfort! And that's what this is, because the road that runs across the southern edge of the Heath has destroyed the southern half of this ringfort.

The remaining section is enough to show its diameter would have been some 30m across. Around the remaining curved edge there is a low bank, beyond which is a deep, deep ditch. The bottom of the ditch is filled with standing water.

The site is at the highest point of this area and would offer great views across the heath if it wasn't surrounded by trees on one side and didn't have a house directly opposite it. As with every site here, the hills to the south are ever present.

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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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