I bought my 2008 Acadia a month or so ago and it came with the regular radio/cd player. When I called Onstar I could hear audio and see arrows on the radio telling me where I'm going. But, last week I upgraded to the navigation system and installed it myself. Now when I call Onstar I can only hear them and cannot see any visual. No one at Onstar seems to know what the problem is. Has anyone else had this problem and can tell me how to fix it? I have Onstar free for a year and would like to take advantage of it, but would like to see the turn by turn directions as well as hear the audio!