Nex 8000
Car is in the shop so I can't verify.
But if I recall, let's say I have google maps open . BT connection from iPhone to Nex 8000.
I am using Radio as a source.
If G Maps tells me a navigation direction change, etc, I WON'T HEAR it unless I have BT as a source.
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I'm in a rental currently, and BT audio like G Maps talks, even when I am using Radio or XM, etc