Dullaghan : Portal Tomb

CountyTyrone
Grid RefH 312 663
Longitude7° 31' 4.29" W
Latitude54° 32' 38.42" N
ITM east480366
ITM north584435
Nearest TownOmagh (16.2 Km)
OS Sheet18
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Monday, 4th August 2003

Only two leaning portal stones remain. In fact they're almost lying down. Actually they are lying down, but the slope makes them appear to be just leaning heavily.

I didn't see them at first, because the farmer is cutting huge ugly drainage ditches across the field, which kept attracting my attention. The tomb stands (or rather stood) on a south facing slope.

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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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