broadcast the music through your car radio but leave nav directions assigned to the on board speaker (speaker in GPS) and then go into "change preferences" and select mute sound
this way you can still hear music but the GPS will not constantly interupt when giving nav directions
You don't have to mute the sound.
Go to the preference menu and go to the voices preferences
Select 'disable voice'
This will mute the navigation instructions but not the music.
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