Tablet as a head unit?

[vintovka]

Im thinking it may be possible to use a tablet as a complete headunit and more

The desirable functions would include everything a better gps has plus music via blue tooth speakers . I left a 7 x 6 square in my dash to accommodate it. Aware of all the legal issues but would treat it as a gps.

Heres a partial list of desirable functions

GPS (with its own gps chip)
speedometer
phone interface
music playback
am fm satellite
you name it.

heck even some of the radar and new collision avoidance stuff would be nice. The tablet could be upgraded as new features become available. Any ideas?