TomTom , Navigon iPhone apps use GPS to give detailed street directions . Navigon app ( $ 99 ) is intuitive : cars are where reviewer expects them to be . TomTom Android app adds power , a bigger speaker and a better GPS chip . Google has beta turn - by - turn navigation for its Android mobile operating system .
TomTom , Navigon iPhone apps use GPS to give detailed street directions . Navigon app ( $ 99 ) is intuitive : Things are where reviewer expects them to be . TomTom car kit adds power , a bigger speaker and a better GPS chip . Google has beta turn-by-turn app for its Android 2 operating system .