It not the sprint navi that needs this capability its the bluetooth device you are connecting to, the navi will already work over bluetooth. Your device has to be a2dp compatible so that the audio stream from the phone is sent to it instead of the speaker.
I have a jabra 8040 headset that is a2dp and the navi works perfectly through it, but my car only supports headset mode so the audio for the navi wont work through it.
Bottom line, its the devices not the software. Hope that clears things up.
