How about TomTom for iPhone?
http://itunes.apple.com/us/app/tomtom-u.s.-mexico/id35568237...
Yes, it costs $60 + in-app purchase for more frequent updates, but still, at least it is accurate.
http://itunes.apple.com/us/app/tomtom-u.s.-mexico/id35568237...
Yes, it costs $60 + in-app purchase for more frequent updates, but still, at least it is accurate.