When the IMU sent this bogus information to the craft ' s navigation system , it calculated a negative altitude . The exact cause of the IMU ' s miscalculation was not disclosed , but if it was tripped by some kind of mechanical problem , that would be bad news . Forgive my naivety but isn ' t this something a PID Controller would help to alleviate ? It ' s been a few years since I studied them but they are supposed to account for errors that can be caused by sensor faults and mechanical issues . <| sep |> Here ' s a few favorites of mine Eternal Tears of Sorrow Heart of WildernesssEiYO 56 QhwIn Mourning The SmokeuPfkAJxur 0 NightRage Spiritual ImpulserXqML 3 lrQoNorther Mirror of MadnessxjEXb 5 hKRekBrymir For Those Who DiedQvXM 9 ZvZ 0 zo . and then here ' s a little shameless self promotion , Check out my band , Definitely fits in with this listantikytheraofficial . bandcamp . comCheers ! m