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The Google Maps app and now the Apple Maps app both work over Bluetooth if it's enabled.
If BT audio is enabled, the directions go over BT audio. If BT is enabled but BT audio is not enabled in iDrive settings, then the audio goes over the headset protocol and it appears like a phone call to yourself. This is handy because it will interrupt any audio source without needing your phone selected as the source. If BT is disabled, obviously the directions go over the phone speaker.
In Apple maps, the sound button at the bottom controls if the audio goes over BT or over the phone speaker. I'm sure there is a similar button on the Google maps app but I don't know where it is.
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