This is a 3-axis magnetic field sensor. Using the current attitude data it forms a tilt compensated Compass. The MK3Mag can be used on its own together with the Flight Ctrl to stabilize yaw control or in combination with the NaviCtrl. The MK3Mag is supported by the FlightCtrl from software version 0.69K upwards.
Note: With Navi 2.0 and up, the compass is now integrated with the Navi board itself.
Caution: For use of the MK3Mag it is essential that the distance between compass and Buzzer minimum 10cm. It is best to mount the buzzer on the outer end of one of the frame arms.
The highest Interfering Magnetic field is generated by: Buzzer, Motors, Power Cables and Metal Parts (In approx. this order).If problems with the MK3Mag are only noticeable at higher throttle, it is likely that the interfering magnetic field is generated by power lines. Ideally the individual DC-lines should have very few bends and Plus/Minus should be routed parallel as their magnetic fields are then compensated by each other (Tips and Video).
Operating Note: The Navi board trusts the compass data to be 100% accurate. Bad compass data will be reflected in a toilet bowling effect or worse case a flyaway.
The best thing to do is to turn off all navi functions and learn how to fly manually and regain orientation based on stick and craft movements. This is where simulator training comes in helpful.