'Tinnahinch 1' : Stone Fort

Grid RefN 363 095
GPSN 36318 09513 (4m)
Longitude7° 27' 26.28" W
Latitude53° 8' 5.79" N
ITM east480366
ITM north584435
Nearest TownPortlaoise (15.4 Km)
OS Sheet54
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Sunday, 25th April 2010

This is one of only three stone forts or cashels in county Laois and there aren't very many in the rest of the Midlands either, so it's a shame that this one and its neighbour down the hill are so ruinous.

The site occupies the northwest end of a long ridge and offers great views to the north and west. The remains are very, very poor. You can make out the 40m or so circumference and see that there is a lot of stone debris scattered around the edges. The banks on the west side are best preserved.

Cattle are free to roam over the site and gorse bushes cover a significant portion. The farmer is very keen on having the two forts on his land and asked me loads about them when I bumped into him up on the hill.

The site is a short walk up a farm track and is easy to find. Ask permission to visit the ring forts at the farm house just down the hill.

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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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