I know android phones have a separate GPS chip inside, so it is possible to use gps navigation apps. However, I read that google maps will not run if you don't have cell service (a pop up that informs you that you need service). Can you get past this if you have the local maps downloaded and saved already on the app? I know that you can use other navigators such as "Backcountry navigation." It's just I would prefer to use google maps vs. backcountry or Waze. I just want to know if it's possible to use google maps for navigation without cell coverage; I know that even if you CAN, its "reliability" will be dependent on exchange between the GPS and phone. Actually, I ask for my dad. I gave him my old phone (droid x) which he doesn't want to pay data for. So he is using it as a PDA primarily, though he would love to use it for navigation as well. Thanks!