Didn't seem to do this when I first installed my deck, but now, when I get a call on my phone the deck automatically goes to the 'map/navi' screen. Is this working as intended? or is there a setting for this?

Even if you didnt notice it before, it was happening. This will always happen when you receive a call. Unfortunately it is not a setting.

Hey man. Mine does the same thing. Its programmed to only show you the name of the caller on the map screen. I guess to not cover the ipod wheel and im guessing it cant go and cover the main menue. I would not mind if it covered the ipod section on the right...for a call. Besides...your not going to pick a song...while driving...and talking on the phone. lol its annoying..but mine does do the same...its not your deck. Dont worry my friend. Also any other questions..feel free to ask. I work in retail and sell/own the unit.