@earnest ermine and I have extensively tested the nav panel and have seemed to have noticed that there is an erroneous cosign calculated for the pitch value. Using asign reverses this error.
I have uploaded @earnest ermine's test build that is extremely compelling and conclusive in showing that the nav instrument has a rather severe calculation error which can throw off autopilots, angle of attack calculations, and far, far more.
This, I believe is a critical error in the game that is likely leading to far more issues in virtual computer computations.
Hopefully this can be resolved asap.