When shopping for a GPS, sales representatives, marketers, and makers alike will bombard you with features that they say will rock your world. Here's a cold, hard look at what's available.

Display
As far as displays go, bigger is generally better, although the clarity and aesthetic appeal of the onscreen graphics plays a big part, too.

Screen size will be primarily determined by which type of GPS you choose. Most factory or aftermarket GPS units sport large screens ranging from 5 to 7 inches diagonally...

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