So how does it work? Our mobile app taps into the GPS chip located in your mobile device. Our technology uses the same GPS satellites that a traditional handheld GPS units, like a Garmin or Magellan, do. So we can pinpoint your GPS location within a 3- to 5-meter accuracy. And, since the maps are installed and stored on your mobile device, our app can access those maps without cell towers. You are free to roam anywhere.
How to install Off-The-Grid Maps (SD card) on my Android device
How to install Off-The-Grid Maps (SD card) on my iPhone or iPad