Now I tested and it seems it slewing works as intended now, but the icon on the abris is far off.
https://youtu.be/joc-vzJj78c
Not recorded, but I observed what tekrc said, after 10 mins drift is so big its barely usable. I understand its more realistic and you should use precision alignment, but its quite annoying to wait 12 minutes just for the ins alignment at every start up, especially in multiplayer.