adding factory navigation?
I want to add a navigation unit to my 2007 expedition but i prefer to go OEM to keep all rear dvd controls and subwoofer. The dealership told me that it was impossible to do. I am not sure whether to believe him or not because he was rude and not very helpful after he asked and I told him that I bought it a different dealership. Is it possible or do I need to go aftermarket now. Thanks.