Skyview compass uncalibration

[Cmac]

I have been successful in calibrating my Skyview compass (both on the ground and in the air) but after a few months it seems to loose its calibration and I have to do it all over again.
Is this normal? Any ideas?

 

[Rhino]

What do you mean by loses it's calibration?

 

[Cmac]

After a couple of months the little airplane on the screen shows up angled off the direction of travel and the indicated wind direction is not accurate

 

[Rhino]

Does this happen gradually, or all of a sudden? Are you using only the ground calibration, or are you doing the in-flight calibration too? What GPS are you using?

 

[jakej]

Have you checked the ADAHRS mount security ?

 

[airguy]

Do you have a separate magnetometer for the system, or are you using the built-in magnetometer in the ADAHRS?

 

[Kronos98]

I've had this happen many times. It show garbage winds and direction usually upwards of 90 knots. So far I haven't be able to determine any pattern or condition that would trigger this - it seems to be completely random. It always corrects itself after I perform an inflight calibration, however following the latest incident, I did nothing and during the next flight the calibration was correct again!