"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…"

"The exact message is btw; "compasses inconsistent"."

"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…"

"Thanks Randy,

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,…"

"Not sure if it's me or some parameter left overs, but I can't seem to calibrate my newly installed Pixhawk with 3.2-rc7.
I have an external compass configured and the Device ID reporting is:

COMPASS_DEV_ID = 73225
COMPASS_DEV_ID2 = -1

After…"

"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).…"