This video shows the maiden flight (including GPS loiter) of the PX4 flight stack on a 3DR Iris quad rotor equipped with a PX4 Pixhawk autopilot (all manufactured and provided by 3D Robotics). These are DEFAULT GAINS (so no tuning yet), but it shows a quite pleasant performance. The flight stack supports waypoint flight and GPS flight with stick inputs for forward/back/up/down as well (not shown in video).