I've posted in several other threads along this line about GPS "add-ons" for wi-fi only iPads.
After a moderate amount of research and shopping, I bought a Bad Elf Pro for a driving trip to Ireland where I planned to use my wi-fi only iPad Mini (no internal GPS). After shopping the field and looking at the recommended nav. softwares list that comes w. the Bad Elf management app., I bought Co-Pilot UK & Ireland. It was very reasonably priced vs. some of the alternatives.
I'm back from my trip and can report it worked BEAUTIFULLY! The Co-Pilot software is a superb nav. program, with very good, clear maps and very good guidance advice both in the country and in urban traffic. We drove 1600 MILES (not km!) in Ireland (a lot in that small country) and I can recall only once where Co-Pilot gave us a bum steer. It was in the country and it seemed to get confused by two very close, and at times close to parallel, country roads and took us around a loop. It wanted to do it again, but we saw what was happening so just turned the opposite direction from what Co-Pilot called for and drove a few miles down the alternate choice of roads, at which point Co-Pilot seemed to recover itself, recalculate a route and take us on to our destination.
I am very impressed with the QUICKNESS of Co-Pilot's recalcualtion when you take a wrong turn. That happened a fair amount but I blame Ireland's many and often confusing multi-exits roundabouts and our slow reflexes more than I do Co-Pilot. Generally it kept us on course very, very well.
And the Bad Elf Pro GPS was flawless. Comes up with it's inital fix very fast in the morning and runs all day long without coming close to low battery. It was accurate enough that it always had us in the correct lane on the few multi-lane motorway routes that we drove.
The iPad Mini was just the right size for hand holding during long stretches of driving where the navigator needed to be keeping the driver on course.
All in all, I highly recommend this package for European car navigation.