Rathcroghan : Ogham Stone

CountyRoscommon
Grid RefM 796 831
GPSM 79586 83108 (3m)
Longitude8° 18' 35.39" W
Latitude53° 47' 49.55" N
ITM east480366
ITM north584435
Nearest TownElphin (9.6 Km)
OS Sheet33
UTM zone29U
UTM x449041
UTM y5761192

This is a subsite of:

Oweynagat - Rathcroghan - Cave
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Visit Notes

Saturday, 24th July 2010

This ogham stone has been used as one of the lintels in the souterrain that leads to the cave below. Its position marks the point where the souterrain turns and descends to the cave.

The inscription is on two edges and, fortunately, faces downwards so that you can see it. It has been read as saying: VRAICCI ... MAQI MEDVVI. The inscription has been translated to mean (the pillar) of Freach ... son of Medb. A second ogham stone was also recorded here, but I didn't see this one.

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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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