I just recently put together a quad build. I have used Pixhawk on a previous build and decided to use one on this build. I set everything up fine, did calibration, but sporadically got "Compasses are inconsistent" pre-arm warnings.
I went back today to do another calibration and I noticed that in the two windows that show the point cloud of calibration points, only the external compass is showing movement as I move the quad around. The second window that is supposed to show the internal compass does not change with movement.
It would seem that the internal compass is not being read or is not delivering data.
How is a good way to troubleshoot the internal compass?