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The Magellan Kit includes its own GPS receiver, which means that it enhances the accuracy of the iPhone's positioning and, more importantly, allows the second-generation iPod Touch to be used with navigation apps for turn-by-turn directions.
The Magellan Premium Car Kit performed as expected. Calls were indeed louder and easier to hear over road and wind noise. Meanwhile, on the other end of the call, listeners stated the audio quality was considerably less hollow. Also, because the Magellan's speakerphone is full duplex, conversations flowed smoothly with fewer awkward pauses.
While it is difficult to tell how much the Magellan system is actually assisting the iPhone's GPS accuracy, we did notice that GPS positioning was less jumpy amid the high-rises of downtown San Francisco. However, the biggest jump in functionality is when the Premium Car Kit is paired with a second-generation iPod Touch. Where there was once only Wi-Fi triangulation, and then only when connected to a Wi-Fi hot spot, the Magellan system adds true GPS satellite navigation that, when paired with Magellan's RoadMate app or any other navigation app, lets the iPod Touch be used for turn-by-turn directions. Of course, whatever app you're using will need to store its maps locally, as once you're out of range of your hot spot, you won't be able to pull data from the cloud. However, that's an inherent issue with the iPod Touch, not the Magellan Premium Car Kit.
Priced at $129, the Magellan Premium Car Kit for iPhone and iPod Touch faces the same major criticism that TomTom's Car Kit for iPhone faces: it's just too pricey for a product that duplicates functions the iPhone already possess. Sure, these functions are enhanced, but there are many people who will have a hard time justifying the expense over a simple $29 suction-cup mount.
However, the Magellan system does have an ace up its sleeve that the TomTom kit doesn't, its adjustability to accommodate the iPod Touch. Adding a completely new feature to the iPod Touch is a much easier expense to justify in our opinion and because the Magellan pairs via Bluetooth, you can use the kit with your iPod Touch and your Bluetooth phone at the same time, which is very cool.