inputs.text: great nav unit gm - great navigation unit impala looked many different solutions adding nav unit impala since gm reason didnt offer one best way go priced 600 great graphics easy plug play installation keep mind load instructions since dont come unit lots options features factory unit half costok badnav takes probably 20 seconds load radio nav like 2 separate programs running screen nav mode dont get radio informationthe nav map also not best directions unit instructing go far way get place road cases however works fine