What is difference between "Navigation" and "Sprint Navigation" apps ? Newby to the smart phone, and am still trying to understand this "app" stuff. The "Navigation" app is a blue arrow, and is the one I use for map and voice navigation. The "Sprint Navigation" app seems to do the same thing in a much more belabored manner. Are these both Sprint, or what ? Why two similar apps ? Is one supposed to do something that the other doesn't. I don't get it.