We have some onboard electronics which switch on/off during flight. We know when these systems are activated they cause MAJOR issues with magnetic interference with the onboard (Pixhawk) compass. It is enough to cause a flyaway/crash when in an autonomous/loiter mode. The external compass is far enough away that it is almost entirely immune to this.
Is it possible to disable the internal pixhawk compass? Basically we would never want to fly unless the external one was operational and if the system fell back to the internal compass it would certainly cause a crash.