Mission Planner - Compas Bad variance on the HUB

Hello everybody,

We notice during our fight test that we get EKF error message from the Mission Planner HUB : “ERROR COMPASS VARIANCE”. The message appear only when we do stronger input.

However, we found neither error message from QGroundControl nor into the log. We don’t understand why.

Then, during the flight, the drone looks stable and doesn’t seems have some sensor issue .

Cube Orange
Hex Here3 GPS (Only for GPS)
GY271-HM5883 external compass (We use only this compas)
Mini Carrier Board AIRBOT SYSTEM
Herelink Air Unit

ArduCopter 4.0.4
Mission Planner 1.3.74

please post tlogs and logs

Here, please find attached logs.

In addition, we did a sensor calibration before flight, but we get the error message on the MP HUP anyway.

What is the condition to display this error message on the Mission planner HUB ? In wich datas is it based ?

Is it only a mission planner error message type ?

Thank you very much for your help !