I have an APM2 running ArduCopter v2.6 with Mission Planner V1.1.97.
I want to be able to flying my DJI FlameWheel 450 down into a valley in auto mode. The problem is that the only place to takeoff from is on the top of the hill. Since absolute altitude doesn't work for copters, how can I get my quad to descend below the takeoff altitude? Can I just put in a negative altitude for those waypoints?
Thanks for the help.