Voice Navigation Killed the Google-Apple Map Talks

Google had never offered voice navigation in the iPhone and wasn't planning to start with iOS 6

Google Chairman Eric Schmidt said Apple should have continued to use Google's mapping application in iOS 6 instead of swapping it out for its poorly received home-brewed replacement, and given the sour reception Apple's Maps app has been given, he may have been right.

But multiple sources familiar with Apple's thinking say the company felt it had no choice but to replace Google Maps with its own, because of a disagreement over a key feature: Voice-guided turn-by-turn driving directions.