Hi there and welcome
The GPS will work in Ireland if it has the map for Ireland. You should have a full charge for the unit before downloading to be safe. The Ireland app is very recent and will have all destinations, it is constantly updates whenever changes occur.
If you would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.