Been browsing Google looking at retrofits as you on your days off. Came across this sat nav, Bluetooth intergration option for us people unfortunate not to have MMI sat nav from factory but is 100% compatable with concert and symphony . Company is called dynavin and its suppose to be plug and play with the new screen been a touch screen. Any opinions. All info in this link
http://www.dynavin.com/products/dvn_a5.php
http://www.dynavin.com/products/dvn_a5.php