How to Nav directions thru the radio on droid

[pat2010ssrs]

Ok not perfect but I can get turn by turn directions from my phone thur the radio by doing the following.
make sure your bluetootn is on phone
make sure your phone was paired to gm music
Download on droid your radio app.
second start the app and pick a station you want to listen to
then go back to home page and slect nav get your driving directions.
the app radio should be playing and you can hear the music on your phone
then slect on the car raido blutooth gm music the car radio will play the phone radio station you had slected.
when the directions come on the radio muted and the direcions are heard on the car radio then the phone radio comes back on