GPS Run Tracking Does Not Require Data
Visitors concerned about roaming data charges, can safely use our Run Tracker with your Cellular Data turned off. All GPS functionality will continue to operate and the Run Tracker can keep a log of each run. Once you stop the Run Tracker, your information is stored locally on the phone. You can view the stats and information. Even run lines can be seen on the map. Without data, the map details won't load. This requires a network connection to pull overlays form Google. You can simply connect to a free WiFi spot to see the map details.
Here's how to turn off Cellular data on an iPhone. In your Settings App, choose General. Tap on Cellular and slide Cellular Data of the Off position: