I would just buy a GPS when you get over there or get one here before you go over that has Europe in it.

If you already had an Ipad or a whatever adding on the software to do a GPS may make some sense, but as you currently don't have anything I think anything other than a GPS would be a waste of money.

Under $200 can get you a new one with US and Europe maps. Use it while you are there, and sell it when you get back. If you want to go used or refurib you can usually get them for around or just over $100.

Just having one beep the speed cameras at you in Europe can pay for itself in one or two speeding tickets.