Mayo : Portal Tomb

Grid RefH 646 134
Longitude7° 0' 47.58" W
Latitude54° 3' 56.27" N
ITM east480366
ITM north584435
Nearest TownCootehill (4.3 Km)
OS Sheets28, 28A
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Sunday, 1st September 2002

I actually thought that I was going to see a standing stone here, but it would appear that the OS map shows the Mayo townland prtal tomb and standing stones in the wrong locations. They have swapped them around.

The tomb is very ruined, with just one 2.2m portal stone left erect. A number of slabs lie about its base, the exact function of which can not really be determined. It is nicely fenced in and protected from the cattle that share the field with it, even if the fence is a little too close to it.

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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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