Anyone here using any of the Garmin iPhone apps? I have two - the one with onboard maps (my primary) and the one which uses maps on demand. I have noticed that whether even when the voice prompts are on (volume is max) - I will get nothing at all (neither through the prius or the iPhone) if the phone is connected via just the phone bluetooth - I get voice prompts only when the iPhone is playing via bluetooth audio. If bluetooth is turned off on the iPhone, I will get voice prompts through the iPhone. Anyone else with the Garmin app seeing the same thing / behavior. Is there a way to get voice prompts through the Prius without playing audio from the iPhone? I assume this is a Garmin app issue and not Apple nor Toyota's?