It's super loud. I've tried the volume switch on the left grip, but it just controls the music.
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You have to wait until the Nav Voice is Active, Then turn it up or down. The volume control will only adjust the Nav voice when it is saying something.
Used the nav for the first time this weekend getting back from an unfamiliar destination. Man, you either get "I can't hear you" at speed or "QUIT YELLING AT ME" when you're stopped - no in between.
You can set the volume to change with speed in the settings also just like a car.
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