@Sn0west: did you ever resolved this problem?

I have sometimes the same problem. I am also using a AUAVX2 but in combination with a Drotek GPS module with compass and running AC 3.2.1.

My analysis is that the problem is caused by bad wires. It looks like that -sometimes- the external compass is not detected by the software. You can test this by disconnecting the external compass and then boot the FC.

So, when the compass module is detected, (you see two different COMPASS_DEV_ID’s) you can perform the compass calibration.

After calibration, reboot the FC with disconnected external compass, then both COMPASS_DEV_ID are identical and represents the internal compass ID.

This is not what I expect… I expect that COMPASS_DEV_ID would be 0 and COMPASS_DEV_ID2:131594.

Although it’s not really important because COMPASS_PRIMARY stays 0 and should also switch to 1

with correct detected external compass

PARM, COMPASS_OFS_X, -181

PARM, COMPASS_OFS_Y, 8

PARM, COMPASS_OFS_Z, -127

PARM, COMPASS_DEC, 0

PARM, COMPASS_LEARN, 0

PARM, COMPASS_USE, 1

PARM, COMPASS_AUTODEC, 1

PARM, COMPASS_MOTCT, 0

PARM, COMPASS_MOT_X, 0

PARM, COMPASS_MOT_Y, 0

PARM, COMPASS_MOT_Z, 0

PARM, COMPASS_ORIENT, 0

PARM, COMPASS_EXTERNAL, 1

PARM, COMPASS_OFS2_X, 111

PARM, COMPASS_OFS2_Y, -183

PARM, COMPASS_OFS2_Z, 43

PARM, COMPASS_MOT2_X, 0

PARM, COMPASS_MOT2_Y, 0

PARM, COMPASS_MOT2_Z, 0

PARM, COMPASS_PRIMARY, 0

PARM, COMPASS_OFS3_X, 0

PARM, COMPASS_OFS3_Y, 0

PARM, COMPASS_OFS3_Z, 0

PARM, COMPASS_MOT3_X, 0

PARM, COMPASS_MOT3_Y, 0

PARM, COMPASS_MOT3_Z, 0

PARM, COMPASS_DEV_ID, 73225

PARM, COMPASS_DEV_ID2, 131594

PARM, COMPASS_DEV_ID3, 0

With the disconnected/not detected external compass:

PARM, COMPASS_OFS_X, -181

PARM, COMPASS_OFS_Y, 8

PARM, COMPASS_OFS_Z, -127

PARM, COMPASS_DEC, 0

PARM, COMPASS_LEARN, 0

PARM, COMPASS_USE, 1

PARM, COMPASS_AUTODEC, 1

PARM, COMPASS_MOTCT, 0

PARM, COMPASS_MOT_X, 0

PARM, COMPASS_MOT_Y, 0

PARM, COMPASS_MOT_Z, 0

PARM, COMPASS_ORIENT, 0

PARM, COMPASS_EXTERNAL, 0

PARM, COMPASS_OFS2_X, 111

PARM, COMPASS_OFS2_Y, -183

PARM, COMPASS_OFS2_Z, 43

PARM, COMPASS_MOT2_X, 0

PARM, COMPASS_MOT2_Y, 0

PARM, COMPASS_MOT2_Z, 0

PARM, COMPASS_PRIMARY, 0

PARM, COMPASS_OFS3_X, 0

PARM, COMPASS_OFS3_Y, 0

PARM, COMPASS_OFS3_Z, 0

PARM, COMPASS_MOT3_X, 0

PARM, COMPASS_MOT3_Y, 0

PARM, COMPASS_MOT3_Z, 0

PARM, COMPASS_DEV_ID, 131594

PARM, COMPASS_DEV_ID2, 131594

PARM, COMPASS_DEV_ID3, 0