The breakdown of Apple's (NASDAQ:AAPL) iOS Maps partnership with Google (NASDAQ:GOOG) centered around turn-by-turn navigation, sources (possibly within Apple) tell AllThingsD's John Paczkowski. Apple pushed Google to provide data that would enable turn-by-turn, but Google was unwilling, at least without in-app branding and/or support for other Google features. One source suggests Apple execs have been taken aback by the Maps uproar. "I think they felt they were farther along than they actually are." (more)