The xGPS project is an experimental task aimed at developing an open software and hardware GPS solution for iPhone and iPod touch. Unlike other apps sold in the App Store like G-Map from Xroad, xGPS is currently only available via Cydia or Installer.app
xGPS features voice navigation with directions while music is playing and turn by turn instructions using Google Maps directions. In Night mode xGPS will automatically turn on between 8pm and 7am or turns on by a timer which you can set manually.
xGPS is currently free. To grab the latest beta version of xGPS you need to have a jailbroken iPhone and have Cydia installed. Then you can add the Xwaves repository by using the following URL: http://cydia.xwaves.net/
xGPS features Turn By Turn Voice Navigation on iPhone. Here are a few video demos beta versions of xGPS on the iPhone
Use iPhone mods and hacks at your own risk! Installing 3rd Party iPhone apps requires you to jailbreak the iPhone before installing the native software and apps. You can use Cydia to do this. Browse the full list of all iPhone and iPod touch native 3rd party apps filed under the software category.
Get it here