'Seahan IV' : Passage Tomb

TownlandSeahan
CountyDublin
Grid RefO 082 197
GPSO 08168 19728 (5m)
Longitude6° 22' 49.81" W
Latitude53° 13' 1.09" N
ITM east480366
ITM north584435
Nearest TownTallaght (7.6 Km)
OS Sheet56
UTM zone29U
UTM x449041
UTM y5761192

This is a subsite of:

Seahan Hill - Passage Tomb Cemetery
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Visit Notes

Saturday, 27th May 2006

At first I couldn't believe my eyes. Were those stones really arranged as I seemed to see them. Closer inspection showed me that they are indeed! What I was seeing was the outline of a small undifferentiated passage tomb. Parallel rows of upright stones then a low stone set at 90 degrees (a sill stone) then the rows continuing but getting wider.

As far as I can tell, I'd just discovered an unrecorded passage tomb! It isn't very big, but then any of the orbital passage tombs at Knowth are tiny structures, so I see no problem with this being a small outlying tomb to the main monuments here on Seahan. In fact, I'd say there must be more waiting to be found beneath the peat.

This brings the total on Seahan to four, not three as I had believed. I'm quite happy about that!

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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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