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Mapdroyd is free and works well, but it will only show you on a map where you are, not give turn by turn directions. .There ARE some out there, but expect to pay.
And I'd definitely take a car charger so it doesn't die in the middle of the trip- Euro cars have the same 12V power ours do, trick is finding a car-USB adapter that pushes enough power. It would need to be USB3, original and USB2 don't send enough amps.