I stand corrected. There is indeed a free turn-by-turn direction application for iPhone - NavFree. Previously on this blog I reviewed the GPS Drive application for Apple iPhone which I gave an enthusiastic thumbs up. However, I can't say the same for NavFree. After using it for a few days, it just isn't up to the task. Thankfully, I knew where I was going and I didn't get lost. However, if I didn't, I would have been lost since NavFree became "confused" multiple times, lost track of where I was, had a poor user interface and was way too "chatty." Unfortunately, there just isn't anything good to say about this application, even for free.
I'll stick with GPS Drive.