I have the same problem as Kentruong, I think. My gps (not a car gps, just a mobile gps) shows 'TTS Voices Street names announced' as an option in the Voice Language lists but when I select one it reverts back to 'Natural Voice street names not announced'. Then I noticed under Sound and Warnings that TTS Pro is greyed out. Is there anyway I can enable TTS Pro so that I can get street names announced?

And please explain as if I'm a 5 year old cause this is my first gps and I read this thread but don't understand where to find some of these configurations
Thanks folks!