Tibradden : Rock Outcrop

CountyDublin
Grid RefO 148 222
Longitude6° 16' 49.32" W
Latitude53° 14' 16.02" N
ITM east480366
ITM north584435
Nearest TownTallaght (7.7 Km)
OS Sheet50
UTM zone29U
UTM x449041
UTM y5761192

This is a subsite of:

Tibradden - Chambered Cairn
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Visit Notes

Saturday, 23rd February 2002

These two rocky spurs stand to the south of the cairn. One (closest to the cairn) is now very broken and collapsed, the other (100m south) still stand tall and slender.

I was primarily interested in these because I had found a 100 year old reference to a large rock south of the cairn having a cross and face inscribed upon it.

The larger more collapsed rocks were definitely going to show no signs of these and the furthest one seemed more likely. Unfortunately the southern face have 'peeled' away and lies face down in front of the main rock.

I did find a deep curved line one one side that could have been a mouth, but it is impossible to be sure.

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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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