What happened to INAV horizon drift?

INAV suffers from horizon drift since day one. It's not that Betaflight does not suffer from it (both Betaflight and INAV originate from the same parent: Cleanflight). In Betaflight it just does not matter at all. In INAV it's a real-life problem tho.

So far, we somehow managed to mitigate horizon drift on airplanes but it's not really fixing the problem. It's there and it's irritating as hell.

Last month I published a post that describes my intent to use the external board as a secondary IMU for INAV. It is "of the shelf" Bosch BNO055. Today I finally put it into a test and to be honest, the results are very optimistic!

More about INAV horizon drift:

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