'Lisda Rush' : Ring Fort

Grid RefG 921 456
GPSG 92077 45617 (8m)
Longitude8° 7' 18.79" W
Latitude54° 21' 32.69" N
ITM east480366
ITM north584435
Nearest TownGarrison (7.1 Km)
OS Sheets16, 17
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Sunday, 26th June 2005

Whilst driving along I past a sign for Lisda Rush Ring Fort, so I thought I would check it out. I drove down the lane and saw a farmer turning the hay in a field. I walked across to him, excahnged pleasantries and started to ask, "Can you tell me where the ring ...". It was at this moment that I realised we were standing in the middle of a very, very circular field! How embarassing!

The fort is about 100m in diameter. It is defined on the east and north sides by the track, while on the south and west side the bank proper is still very clear.

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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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