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The XGPS300 cradle for the iPod Touch looks much like a protective case. You can slide the iPod Touch into the cradle and use it as usual.
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On the back, the XGPS300 has a switch that makes it work either as a juice pack or a GPS device. It can't work as both at a time.
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The first time you turn the GPS function of the cradle on, there will be a prompt to tell you to download the free app from the App Store.
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The app is called NavAtlas and it works only with the iPod Touch when used specifically with the XGPS300 cradle. It won't do anything if you don't have the cradle.
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Once both the hardware and software is installed, the iPod Touch works very much like an iPhone 3G (or 3GS) in terms of GPS functionality.
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The XGSP300 cradle connects to a computer via a Mini-USB port. You can charge the cradle, charge the iPod, and sync via this port.
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The XGPS300 also comes with a car kit, complete with a windshield-mounting device and a car charger.
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The NavAtlas app works both vertically...
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...and horizontally.
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