Forget route planning in Ireland
Sorry, but due to the crass and crazy way that the Ordnance Survey of Ireland don't sell their data, probably to protect another semi state called An Post, the post office, there's no decent coverage for route planners in Southern Ireland. Most of the PC based platforms, you will be lucky to get more than the major National routes, with maybe a few minor roads, but in the more remote areas, all you will get will be a spot on the map with a name, and no road structure at all! Autoroute for the UK and Northern Ireland is excellent, with street level mapping that is reasonably accurate. Once you cross the border into the south, there's street level for Dublin, Cork, and possibly Limerick & Galway, and that's your lot, the rest of the country could well be desert for all the road data that's there.
Despite MANY protests, the government have done their usual trick, NOTHING at all to resolve what is a disgrace for a supposedly tourism friendly country.