CarPlay car audio Navigation volume test addition
I have noticed in two cars (my 2019 Nissan and a 2019 Subaru) that with CarPlay the "Navigation" volume can only be adjusted when the Waze app is actually "saying" something.
It is possible to stimulate a voice response (change to an alternate route and hit "go" or use the microphone to enter a nonsense command).
The addition of a "test navigation sound" to the "sound options" menu in Waze would be a more helpful and direct method to adjust the car's entertainment system "navigation" volume. Waze could just babble about something and show a tool tip "adjust car audio volume now" for 20 seconds or until the user exits the test.
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Richard commented
A followup comment to my own post: The easiest way to adjust Waze CarPlay Navigation volume that I have found is to poke the microphone icon to start a voice command, then say "help". This gets a brief verbal prompt and stays in the voice command mode (so just say "help" again to get Waze to talk some more).