How do I turn on trail following?

1. Open the trail in the app.
2. Go to the "Trail" section of the information area at the bottom of the map screen.
3. Then press the red icon at the bottom right of the screen.
4. On iOS, you will need to allow the app to use your location in the background. Click on "Change to Always Allow".

Following the trail is enabled. The application will inform you when you go off the route and inform you when you are near points of interest.