How GPS triggering works
The app compares the phone's position with each stop's circle and direction cone. It processes batches of fixes in order, ignores stale positions from before the trip, and never skips a stop between two fixes on a fast road.
- Closest-stop and next-stop logic with a bearing cone and 360° wraparound
- First narrated stop always plays; a stop playing a long clip can be set to cut off or wait
- Marker stops (bus stops with departure times) update the trip without interrupting audio
- The tour ends automatically after the final marker