Drumnigh : Artificial Mound

Grid RefO 233 423
Longitude6° 8' 43.07" W
Latitude53° 24' 59.06" N
ITM east480366
ITM north584435
Nearest TownMallahide (3.8 Km)
OS Sheet50
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Sunday, 25th August 2002

This is an unusual one. I was expecting to find a round mound here, but instead I was confronted with a curious rectangular mound. This is 25m long, 12m wide and 3m in height. The long axis is aligned north-south.

Despite the mound being nothing special to look at in its overgrown state there are a couple of things that should be mentioned. The south end seems to have been dug into, but the gorse and nettles stopped me from seeing if anything was revealed. The main thing, though, is that the mound is directly north west of Howth, meaning that the winter solstice sun would rise over the southern end of the promontory. There is a very clear view of Howth from here and so the alignmment does not seem to be a coincidence.

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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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