Compass calibration icon on status bar
The Sensors menu features an option to "use the embedded compass". Below this option there is a textual information about the status of calibration of the compass (usually in %).
It happens to me quite often that, when using this embedded compass, I launch with my compass not calibrated yet.
To avoid such mistakes, I would suggest to add an icon on the status bar indicating whether the compass has already been fully calibrated. The icon would work similarly to the icons indicating GPS fix, external baro connection, or LIVE tracking status.
Thanks in advance for considering such a feature.