EnhanceCompass Sensor to support True North

Qt currently only supports magnetic north readings. It should be possible to get true north readings, (and declination) from Qt to properly orient maps and the user.

This article describes the steps in detail: https://www.codeproject.com/Articles/1112064/Calculating-True-North-for-IoT-Applications

But in general you need to plug in the current position to determine the declination, which is then added to the compass reading.

However Android provides: android.hardware.GeomagneticField.getDeclination()

A Library exists for iOS: https://github.com/stephent/ObjectiveWMM

As for the API I would assume you could minimally provide declination() property and instructions to the developer to provide a real pair (lat/lon) and isDeclinationIsValid() property being true if the coordinates are supplied and valid gps coordinate pair or resulting in a valid declination.