(Navigon Mobile Navigator for iPhone Forum Review by cjvitek For more Forum Reviews, see the TiPb iPhone App Store Forum Review Index!)
MobileNavigator North America [$69.99 - iTunes link], by Navigon, is the second GPS TBT app I examined. This one requires you to download all the maps in advance (1.5 GB for the US version, 1.67 for the European version) so make sure you have space on your iPhone. The advantage of this is that you can get GPS directions even if you do not have an AT&T signal. In addition, the actual “routing” process seems a little faster since it is not downloading directions OTA.