I traveled to Ireland for 9 days, driving from Dublin south, along the coast ending up in Clifton before driving back to Dublin. This app was a perfect companion. Used with my iPhone 6, it worked perfectly when I arrived before I was able to pick up a new sim with data. The phone must not be in airplane mode with data on, as long as roaming is off, you won’t be charged for anything. This way the GPS will still work. You don’t need to get a local data plan, but it helps being able to look things up on the fly and navigate to them. The App has a good amount of POI data, but it isn’t complete, it uses foursquare and wikipedia for other POI searches, but you’ll need data access for that. Navigation was very accurate, and voice commands were spot on. Good notifications and markings of speed changes, and it would always give you a heads up about sharp turns even if you didn’t have an active route programed. The price is right for this app, it didn’t fail me once.