Specifically designed with Joe the Plumber in mind, the iTrack is easier to use than a cell phone and cheaper to operate than most GPS services on the market. There aren't any "special" codes to memorize and you won't need to take any college-level computer courses to learn how to use it. If you can use Google or Yahoo maps, you'll find where your iTrack is - quickly and accurately. Uses Cellular and GPS Technology - Designed to be used in conjunction with cell towers and GPS satellites, all you will need to operate this simple beauty is a pre-paid SIM card. The iTrack uses up to 32 satellite channels and cellular towers for accuracy within 10 feet.