Sir perhaps your the best person to answer my query here... Have you used Google Navigation (provided on all andriod phones,these days). If you were to compare G-Nav with MMI what is it that MMI does better that G-NAV cannot? I"m also contemplating buying MMI but wanted to know if it really would be useful . To the places I've traveled and used G-NAV , it has been quite accurate (to about 30mtrs).. There are times where i've blindly followed G-NAV and its brought me safe and sound to my destination.. Could you please elaborate?