Apple Store is making exclusively available of its Dual GPS Cradle and Battery Cable. The Dual GPS Cradle not only turns your iPod touch into a fully featured GPS navigation device for in-car or handheld use, it also allows you to take advantage of a multitude of other GPS-enabled apps for boating and topographic maps.
The Dual GPS Navigation and Battery Cable for iPod Touch has a built-in GPS receiver with adjustable windshield mount to your car. Additionally, a rechargeable battery to power the GPS or recharge your iPod Touch.
Other features include amplified speaker for voice commands or play music while in navigation mode and a Turn-by-turn NavAtlas US and Canada navigation app within the package.
Source Apple Store
This is an excelent navigator, very handy but it came with software problem. Other than that excelent machine