The app code is in ua/nav. Let me map it.
Offline GraphHopper routing, MapLibre, a 5.7k-line Tuning.java which is clearly the core. Let me read it.
The parameter names point to a GPS-denied dead reckoning theme (IMU-based stop/resume detection, gyro turn matching, road snap, blind deviation). I'll check the parameter descriptors list S next.
The in-app labels (Ukrainian) confirm it: "Без GPS" = without GPS. Now let's locate the engine — sensor usage and where Tuning fields are consumed.
Sensors and GPS live in zb. Reading those first.