MultiWii

Enable in-flight level calibration is an option under Baseflight's Configuration tab and CALIB (which I'm assuming places the model into in-flight calibration mode) is an option under the Mode Selection tab.

Anyone ever use these features because I can't find any reference to them anywhere. I'm curious if this does an auto-calibration of the PIDs or does it calibrate pitch/roll trims or what.

Baseflight seems to have a wealth of features but the documentation is terrible.

=\

No, nobody uses that.
I doubt it even works.
It was something that was copied verbatim from multiwii, and probably didn't work there, either.
All it does is calibrate roll/pitch offsets for accelerometer, which you can do just as easy with acctrim.

Ancient artifact. Got it. Thanks!