How does the Tower "land" function work - in regard to altitude? I have a mission that is set to 50 ft altitude for the whole thing. When I add LAND, it shows a down arrow and "75.0 ft". I do not understand why it would land 75 ft from a 50 ft altitude. There is no apparent adjustment to this 75 ft. In fact, if I set LAND as my first "waypoint" it shows a 75 ft descent. Way confused, and NO answers after an hour of searching around.