|Maghera - Grave or Cross Slab|
I am nearly half way through all the round towers in Ireland now and so I had to chuckle to myself when this turned out to be nearly half a round tower!
There really is not much left at all; just a 4m high stump with a gaping hole in the side.
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From Castlewellen take the A50 south towards Newcastle and then the B180 north. Take the first right and just 200m on your left you will see some green gates (probably locked), park here and walk along the track/road beyond these gates. The round tower is in a field to your left near the church.
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.