iPhone GPS apps have revolutionized the car navigation business. Until a few years ago, people used to rely on one trick pony navigators to find their way on the road. People still buy PNDs but that market does not have as much juice as it did years ago. In fact, many GPS makers have shifted their focus to mobile applications to grow their business (or stop the bleeding). Garmin and TomTom are just a couple of well-known companies getting involved in the app business (iOS & Android).
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