Not sure if it's a bad gps entertainment center or just a very poor design of the navigation system. My 2 week old 3500 with the upgraded radio gps will not dsplay the navigation or maps while i'm on the phone using bluetooth. I've tried to push the map button to swap the screen while on the phone, but all it will display is the current call information. So basically if i have a navigation route set up and either make or receive a call, i lose the ability to get directions to my destination. same holds true if i have just the map screen on without a route entered, i lose the maps while on the call. The dealer has ordered a new map sd card as the original is a dec. 2012 and the replacement they ordered is dec. 2013. have not been to the dealer to have them swap the card, but i don't think that will upgrade the issues i'm experiencing with the navigation and phone. Another issue. the bluetooth doesn't recognize the majority of my voice commands for my phone book. the phone book register only displays 1 name at a time starting from A. So having to keep asking it to display next would take hours for a list of 600 numbers. according to the manual it has a capacity of 1000 numbers so it's not full. The phone picks up the incoming phone number, but not the callers name that is associated with the number. Is this factory radio that bad or is my unit defective? Thanks, Rick