Hi Messyhead,
Stable-Hover sets the Hover height and maintains that height.
Alt-J and Alt-K adjust the Hover height down/up respectively. Watch your altitude gauge as you press the keys,
it jogs up or down 10 ft or 5 meters depending upon whether you are blue or red.

Pop-Up works Up and Down from the Hover height.
Pop-Up toggles Up 20m on the first keypress, then Down 20m on the second keypress.

Does that clear up the functions?

Last edited by Javelin; 06/08/18 05:10 PM.