This article on iPhone maps, just in from Jim Hamm, is well described and illustrated. "Here's an article reviewing the new maps feature in the iPhone 5. Conclusion: Pretty darn good."
And, look at that same site http://blogs.cars.com/kickingtires/car_gadgets/ for info on car buying, reviews, in the news, recalls, video, 2012 Auto Shows in New York, Chicago, Detroit.