Prince William's Seat : Standing Stone

Grid RefO 181 182
GPSO 18100 18199 (3m)
Longitude6° 13' 56.79" W
Latitude53° 12' 4.04" N
ITM east480366
ITM north584435
Nearest TownKilmacanoge (7.6 Km)
OS Sheet56
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Saturday, 6th June 2009

As I was climbing up to the cairn on top of Prince William's Seat I noticed this stone. It now leans to a very low angle, but the way it has eroded shows that it once stood on end. It would have stood about 1m above the current ground surface. Interestingly, the stone is at the stone is the northwest end of a line (possibly even a double line) of stones and boulders that point to Ravens Rock and on towards The Great Sugar Loaf Mountain. The is northwest-southeast alignment could be significant and should be checked out at the Winter Solstice.

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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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