Knocknagin : Passage Tomb

Grid RefO 183 666
GPSO 18265 66627 (8m)
Longitude6° 12' 42.52" W
Latitude53° 38' 9.78" N
ITM east480366
ITM north584435
Nearest TownBalbriggan (3.4 Km)
OS Sheet43
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Sunday, 17th October 2004

I had read of some passage tombs that were being lost to the sea, so I decided to check them out. I was in no way prepared for just how much they are being washed into the sea!

A rough circle of rocks lies on the beach to the east of Knocknagin (County Meath) below the high tide line. There are some other rocks scattered to either side of the central 'ring'. Normally you wouldn't take any notice of such a group of large stones on a beach, but they are the only ones on the entire 5km stretch of beach and were recorded as being more complete in the 1800s. Obviously, I can not be 100% certain that this is the correct spot, but it does tie in with the information I have to hand.

There was also mention of two tombs being lost 300m to the northeast, but this would put them well into the sea, so the direction must be either northwest or southeast. Checking both directions I could find no trace.

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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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