"I couldn't calibrate the second compass using APM 2.0.14 on OS X. (At that time, the offsets for the second compass were always 0). I switched to Mission Planner, but the offsets for my internal PixHawk compass are very poor. I needed to skip the…"
"1. I'll review the process how to raise an issue for this.
2. I need to correct myself; I have had issues with Compass calibration by utilizing APM Planner 2.0.14, which only stores the first compass. This triggers the "PreArm: Compass not…"
"I've built 2 frames with a Pixhawk now, and the bad compass results are consistent. (In a sense that 1 compass is always having very high offsets). I also turned off the PreArm Compass check, because it tends to give Bad Compass Health PreArm…"
"I went outside and did Live Calibration again. Takes some time, before I got enough samples. (Using telemetry for this). I observed very poor offsets (>500) on one axis for the second compass. (Pixhawk internal?).
Did a small test, loiter…"
That made sense. I installed Mission Planner and redid the calibration. (I'm on a Mac so I was using APM Planner 2.0.14 before). Calibration was successful. PreArm checks were lifted. Need to find something to redo the calibration,…"
"That's really great. I believe I had the same problem. I have done the Live Calibration Dance atleast 10 times, but it still would complain about Compass Calibration. I also have the 3DR external compass connected to the Pixhawk. (Running 3.2-rc5).…"