We perform the M600 calibration process and if I immediately arm the drone then all is fine, and I get ready to go. If I wait maybe 60 seconds, it starts showing compass errors "Compass Error. Compass direction is not the same with IMU".
We have performed calibration over and over with the same result - we have tested at differing positions - mostly about 10 meters away from a corrugated iron roof.
The drone's warning light flashes slowly between yellow and red.
Any ideas on how to fault find this.

Thanks

"The drone's warning light flashes slowly between yellow and red." -> Compass calibration required  Matrice_600_Pro_User_Manual_v1.0_EN_1208.pdf (djicdn.com)
page 41

Most probably unhealthy IMU check this :

https://dl.djicdn.com/downloads/ ... 1.0_en_20160622.pdf
page 2 / VI & VII

LV_Forestry Posted at 12-10 06:49
"The drone's warning light flashes slowly between yellow and red." -> Compass calibration required  Matrice_600_Pro_User_Manual_v1.0_EN_1208.pdf (djicdn.com)
page 41

Many thanks for your help

chill1954 Posted at 12-11 00:20
Many thanks for your help

You're welcome