MotionX-GPS Drive is not a device by itself, but is a door-to-door navigation application for the iPhone. While it retails for $3, don’t look down on its purchase price – after all, you might find it to be jolly useful as it is able to offer turn-by-turn directions that boast always live and up-to-date maps and points of interests. Compatible with the iPhone 3G and 3GS, maps within will cater to folks living in the US as well as Canada, making life much easier. Its user interface plus allows one to control iPod music, and can take advantage of the iPhone 3GS compass.

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[Source] dhiram