One of the most common questions we receive about our trail guide apps is whether or not they work when you do not have a cell/mobile phone signal. The answer is a resounding “YES, they do work offline”! All of our apps are designed to work when you are in the middle of the wilderness, nowhere near a cell tower. (Otherwise our apps wouldn’t be very useful, would they?)
So, how does that work?
When you first download the app from the App Store or the Google Play Store, the device to which you download the app must have an internet connection. The connection can be a WiFi connection or a cell/mobile connection (though a mobile connection may not be the best idea since unlimited/unthrottled data plans are quickly becoming a thing of the past). While you have that initial internet connection, the latest waypoint and track files are automatically downloaded to your device, plus you have the option to download photos and offline maps to your phone. You should download a map set so that you have topographic and other information about your surroundings.
When you are offline, the app uses your device’s built-in GPS unit to detect where you are and plots that information on a map. GPS, or “global positioning system”, is truly global, and works anywhere on planet Earth since the information is received from satellites.
- Will your app work when there is no cell/mobile service? Yes. So long as your device has a GPS receiver, it will work.
- Do I need a service plan on my phone to use your app? No. So long as you can connect to the internet with WiFi and your device has a GPS receiver, our app will work on your device.
- Will your app work on my iPod Touch? It can. The iPod Touch does not come with a GPS receiver. The same is true of a lot of tablets. But you can purchase an external GPS unit to plug into your iPod Touch, such as a Bad Elf.
- I’m pretty sure that GPS isn’t available in [remote location X]. Will your app work? Yes. GPS is global. So long as you are not deep in a canyon or cave (i.e. your phone cannot receive a GPS signal from space), you will be fine. Even in canyons, deep mountain valleys, and under deep foliage, the signal will usually just take longer to acquire.
- Can I send messages to my family using your app when I do not have cell/mobile service? No. The GPS unit in a phone and tablet is a GPS receiver. In order to transmit messages using GPS, you need a GPS transmitter, such as a DeLorme inReach or Spot.
- Why can’t I see Google maps when I’m offline? We do not use Google maps for offline use because it is against Google’s terms of service to cache the maps for offline use. Rather, we use topographic maps (the style depends upon trail location) that you can download to your device and which are displayed in the background of the map.
Let us know if we forgot anything and we will add to the FAQs.