Darth Vader is now available as a
TomTom voice.
And there are more "Star Wars" voices coming -- C-3PO in June, Yoda in July and Han Solo in August. Each voice is only $12.95 and samples can be heard from the link above.
If you do choose the Dark Lord of the Sith as your driver's guide, you will get actual instructions such as "Bear left, to the dark side. Then in 200 yards you have reached your destination. The Force is with you, but you are not a Jedi yet." You also will get the theme music, the bad-ventilator breathing, light-saber effects and the sound of a TIE fighter zooming by.
Source:
LATimes