Talk:Irish grid reference system

Questions

 * Is there a direct relationship between lat/long and the grid system? If I have a gps which give info in lat/long how do I/can I translate this into a grid reference? [preceding anon edit on 11:18, 18 April 2007 by 62.173.102.55]
 * Most GPSs have the means to change from DMSDMS units to any one of a number of national grids, Irish included. I suggest you rtfm to find this as the mathematics are rather too difficult to do on the back of an envelope. --Red King 19:43, 18 April 2007 (UTC)
 * Is Irish National Grid Reference System the correct title, given that the system is used not only through the Irish Republic but also in Northern Ireland too?. It is actually an international, or at least transnational, system. -- Chris j wood 13:53, 23 Oct 2004 (UTC)
 * Yes. The system is used throughout Ireland, hence "Irish". It's technically international in the sense that it transcends state boundaries (being used both in the Republic of Ireland and Northern Ireland). However, even in Northern Ireland, I doubt you would find many who would consider for example, a trip to the Republic or vice-versa, an international trip. In the same way the Irish rugby team is not a transnational team - it's representing the apolitical Irish nation. In summary, yes, Ireland and Irish are ambiguous terms, but entirely appropriate here. zoney &#09827; talk 12:58, 26 Oct 2004 (UTC)
 * Was the Irish National Grid Reference System really devised by the Ordnance Survey. Certainly that organisation does not now operate in either the Irish Republic or Northern Ireland (which both have their own government mapping organisations). And given that pre-independance Ireland had its own separate civil service, it seems unlikely that they ever did. -- Chris j wood 13:53, 23 Oct 2004 (UTC)
 * I don't know. It could have been the Ordnance Survey of Ireland (OSI), were they all-island before partition? zoney &#09827; talk 12:58, 26 Oct 2004 (UTC)
 * It's a little confusing that the grid is described as having 25 squares, but the map shows only 20. Also, why was "I" chosen to be the dropped letter? (D'oh! because it looks like the numeral one).--Malcohol 13:37, 18 July 2005 (UTC)
 * E, K, P, U and Z are sometimes shown along the right side of the grid, but they're not on any maps - maps covering those areas are on the UK grid system, the OSI and OSNI don't make maps covering them, so they're out of use. --Kiand 19:30, 15 December 2005 (UTC)


 * How do you translate from the Irish National Grid to the extended British National Grid? They both use 100km squares so I assume it is a simple rotation followed by a translation. (anon)
 * Yes, rotation to realign grid north to true north and a slight jiggle for best fit. It's here somewhere, I've definitely seen a graphic with both on it, with a formula --Red King 17:59, 20 December 2005 (UTC)


 * should there be some mention of ITM (Irish Transverse Mercator) grid adopted by OSi and OSNI in 2001? - DGW 18/4/07.

http://www.irishscientist.ie/2001/contents.asp?contentxml=01p66.xml&contentxsl=IS01pages.xsl

http://www.osi.ie/pdf/itm_paper1.pdf

This article should be called Irish grid reference system
According to the OSi web site here this article should be called Irish grid reference system (not Irish national grid reference system). I propose a title change. If anyone has any input regarding the title please share it now--Trounce 09:40, 11 October 2007 (UTC)


 * It seems user Ludraman created this article as an "equivalent" to the British national grid article.It looks like user Ludraman simply swapped the "British" part of the title with "Irish". However, that wasn't the correct name for the grid system.--Trounce 09:57, 11 October 2007 (UTC)


 * For the record I re-titled the article.--Trounce 18:53, 17 October 2007 (UTC)

Overlap - image?
I think a map showing the Irish and British systems, and where they overlap, would be useful. The 100km square boundaries should be adequate. I might be able to do this; I'd just need an outline map of the British Isles in a GIS-suitable format. 86.21.227.237 (talk) 14:37, 14 September 2008 (UTC)

Upgrade required
Ireland has a new grid reference system based on ITM. Users are being urged to upgrade from the system described on this page. Both systems are in use at present and this article needs fairly major work to reflect these changes. Unfortunately I cannot undertake this at present. Could someone add an appropriate banner to the head of the article?
 * Peter Mercator (talk) 14:24, 8 March 2013 (UTC)

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External links modified (January 2018)
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