Streaming maps on the FATMAP app requires an internet connection.
However, with the FATMAP Explore membership (available in the FATMAP App with a 7-day free trial) you are able to download as many areas as you like on to your mobile device (we recommend downloading over WiFi).
When you have done this, you will not need mobile/cellular data in order to use FATMAP. Browsing the map, using the terrain tools and all Routes and Waypoints will be available in the offline areas you have downloaded.
Note - currently, My Adventures (tracked routes), My Guidebooks, Route To and Route Planning, Map Discovery and the Discover tabs are not available offline.
GPS functionality does not use data but to update the real-time data information, such as the snow layers and resort status, updating your offline maps and updating the app itself, you will require data.