Back from my last flight and calibration of airspeed sensor, I switched to ARSPD_USE=1. Just fired up the plane on the bench and noticed in stabilize mode, a lot of surface movement in Vtail, and in Mission planner the horizon was moving erratically when the plane was stable and level on the bench. Did some googling and found an old DIYDrones article about ARSPD_USE=1 causing this, so set this to 0 and rebooted and the issue is gone. Wondering how to avoid this - is there a reintroduced issue in latest dev version, or is this possibly because of incorrectly calibrated airspeed sensor? Any ideas would be helpful, Cheers, Paul