how will GPS thing will kick start in india???

well to start with i would like to comment on the recent hullaboo about the much touted GPS and PND(personal naviagtion devices). Every now and then we keep hearing ,majorly reading blogs about this new technology. But i really have a doubt on this coz till now we dont have ne authentic and detailed maps of our cities(or is there any company who have good accurate maps of our cities at least ????