Unfortunately, it's like Gokivo and requires a $9.99/month charge that will appear on your AT&T bill. You can find it
here.
I really hope TomTom and Navigon don't make their turn-by-turn apps like this and just charge a flat fee instead, even if it's $100. I don't want a subscription and I won't mind paying for a map upgrade as long as I get to do it when and if I want to.