Although MotionX GPS Drive relies on a data connection for its maps, it lets you preload a route. (Credit: Wayne Cunningham/CNET) In the face of a few solid free navigation apps for the iPhone, such as Bing or MapQuest, MotionX GPS Drive would seem to have trouble justifying its price, even at only 99 cents. But it has proven a popular enough navigation app that Pioneer integrated it with the AppRadio head unit. Two features of MotionX GPS Drive give it an edge over the free apps, its destination search capabilities and the ability to preload maps. MotionX GPS Drive is a connected navigation app, meaning it relies on an iPhone's data connection to get its maps. However, it is not completely useless without a data connection. After finding a destination, it gives the option of preloading maps for the route, so with a little foresight the app remains useful away from cell towers. Testing the pre-load option, the app took 14 minutes on a wifi connection to download the maps for a...