Compass cal / winds aloft error

[lancair360]

You do not need the inflight calibration. The system did not even have that as an option until a few releases ago. Careful ground calibration can yield excellent results. My Glasair Super IIS RG (fiberglass just like your Lancair) was calibrated on the ground and has never had a problem. The flight calibration is just easier, not better. It would easy enough to try the ground calibration to see if it works for you.

Yup that's next. Ground cal and see if errors remain. More data! More excuses to go flying. Woo!

 

[lancair360]

Dynon replied the inflight cal is NOT necessary.

update ——-
Went and redid just the ground calibration. On the runway for takeoff and landing at that airport and my home airport the heading was within 1 to 2° of charted runway heading. (Previously 10° off after in flight cal)

Winds aloft were still a little wonky, but very light winds so I will have to test again. So far it looks like ground calibration works fine, and in-flight calibration messes the whole thing up. Will update Dynon and the message board.

 

[Dynon]

I'd clarify that to say that in some aircraft, acceptable performance can be had with just the ground calibration. But we'd expect that many (most? hard to say without having more robust fleet data) aircraft would benefit from also doing the in-flight cal.