GPS should work fine in most countries in Europe. Obviously you won't have WiFi everywhere, so you'll need to buy a pre-paid SIM card and input the correct APN settings for that network. I suggest deciding now on which SIM card you will use and writing the settings down for it. If you want, you can use the SIM card you got with your iPhone, although data charges will be expensive. And once you buy the app, that's it, nothing else has to be paid for unless additional content is available.
As for tips, I suggest you get a travel charger and a car charger if you are going to be driving a car. I also recommend buying some city guides for the countries you are visiting as they can be pretty handy.
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"Everybody has common sense, but most just don't use it, then you wonder why?" - Neo-Tech
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