Portable GPS devices are among the hottest selling CE gadgets: An amazing 12 million are expected to be gobbled up this year, according to the Consumer Electronics Association. Not too bad for a device that simply tells you where to go—and gets annoyed if you decide to take a different route! (We affectionately call our Garmin GPS “Naggie” since she gets a dismissive tone if we choose to blaze our own shortcuts.).

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