Comment by rapnie
8 hours ago
Just installed. It looks very neat, but I wonder how accurate the compass is. I am in a train now on a completely straight track and I get compass deviation of >60° as if the train is making curves all the time. OpenStreetmap places me in New York instead of Netherlands.
> but I wonder how accurate the compass is
MBCompass uses sensor fusion for accuracy, combining sensor data from the accelerometer, gyroscope, and magnetometer.
It is one of the most accurate compass apps. Don't trust my words, try it with different apps on Google Play and with some FOSS options like Compass by Philip Bobek: https://f-droid.org/en/packages/com.bobek.compass
And importantly, for true compass accuracy, I'd recommend you use the "true north" (magnetic declination) function, which requires location access. It takes some time to lock GNSS hold (the same goes for the current location button on the map view, default map location is Paris, France), but if you're moving, it locks pretty quickly and shows your current location with tracking (if you're moving.)
Is it an electric train with power lines above? They produce huge magnetic fields and will cause any compass to deviate.