Glenroan : Portal Tomb

Grid RefH 547 914
Longitude7° 9' 0.17" W
Latitude54° 46' 2.97" N
ITM east480366
ITM north584435
Nearest TownDunnamanagh (15.8 Km)
OS Sheet13
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Monday, 4th August 2003

This one is signposted, but I don't know why! It is embedded in a hedge, imprisoned behind barbed wire.

It is all leaning very heavily and the capstone might just be held in place by the hawthorns. The portal stones are about 1m tall and both lean. The capstone is an unusually flat slab, that is much wider than the tiny tomb.

Still, it amazes me that this site is signposted and that somewhere as special as Ballyrenan (County Tyrone) isn't. The mind boggles!

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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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