Ok so I am going camping/hiking this weekend. I was wondering if the in-Phone GPS will work without cell tower connection. I plan on using this app: https://play.google.com/store/apps/details?id=com.grdurand.hiker I don't need real fancy features, basically I am looking to set a "home" point, and use GPS to point in that direction. It would be nice for it track how many miles away, etc too. Will these apps work, or do they require a data or verizon connection?