The external hard disk drive lets you disconnect the storage device and connect it to your computer in order to transfer music and movies for playing them while driving. Moreover, NAVist III includes a 7-inch display which requires 2DIN space in your dashboard.
In terms of radio functions, NAVist III comes with AM/FM onboard tuner integrating a 5x50W amplifier plus Bluetooth connectivity for wireless connections to your phone or MP3 player. Beside all of these, the multimedia features are completed by an iPod cable which lets you connect the iPod and stream music or video files straight on the LCD display.
Unfortunately, there's no word on its price yet but the whole NAVist package will most likely be sold for a few hundreds dollars, taking into account that it features a large LCD screen combined with external storage capacity and Bluetooth compatibility.