Mapcodes also have to be combined with some context. In most places it's just the country name, but in large countries it also requires the state (or equivalent).
So if you go to the interactive map on the mapcodes site, there's a little link marked context and you need to change that to Ireland. Results in this:
So, they want to throw out the old coordinates system (which was absolute location regardless of any "context"), with a system that if you loose the context information, or misinterpret it, you can wind up in a very wrong location?
I've written a fairly extensive GPS library for some embedded device projects in the past, and I can attest to the computer not caring about the long coordinate system, they are just floating points really.
So if you go to the interactive map on the mapcodes site, there's a little link marked context and you need to change that to Ireland. Results in this:
http://www.mapcode.com/getcoords.html?iso3=125&mapcode=0C.T4...