The Mazda 5 has a USB port into which the ipad can be connected.
items in itunes can then be listened to via the car radio.

 The problem I have is with Audiobooks (bought from itunes) Every time the car engine is stopped the audiobook reverts to the beginning and there appears to be no way of advancing to the previous spot. The >> on the car audio monitor advances to the next book, not to the next chapter.

Once the ipad is conected to the car, the iTunes 'slidebar' on the ipad itself is blocked out so I cannot advance it using that.

What am I missing?