[alarsuel]

Not sure if the OP knows the dif between sprint nav and others like tomtom, iguidance, etc. Some 3rd party programs (tomtom, garmin, etc) store maps on the storage card of your phone so they only need a gps signal to function. Others like Sprint Nav, or Google Maps require an internet connection because they access the maps online while you are driving. These programs require you to have a data plan to function. You will be charged for the internet usage if you don't have a plan. Sprint Nav also requires you to sign up for that service individually if you don't get it in an everything plan. I believe the charge is 10 bucks a month. There are better free alternatives out there as mentioned earlier in the thread.