Your smart device needs to have Location Services turned On.
(iPads without cellular do NOT have a build-in GPS receiver and therefore will NOT work)
First of all check if the Displayed Accuracy is LESS than your set “Minimum Location Accuracy” in AIRCRAFT-Settings, otherwise Follow will NOT work.
Default “Minimum Location Accuracy” is 10 meters.
FOLLOW settings on Android vs iOS:
(iOS doesn’t display a compass)
Difference between “Heading Mode:” ‘Course’ and ‘North’:
For “Heading Mode:” ‘Course’ to work you have to be moving at a speed of at least 1 m/s.
Short example on YouTube: