It also allows specifying the time the quadrocopter spends at a waypoint
location and the required accuracy before the camera takes a
photo. Photos are normally taken on the fly. The camera mount on the
bottom of the quadrocopter includes two servo motors which control
the pitch and roll angles of the camera. This allows the camera to stay
in a nadir position during the flight. The camera shutter is controlled
with an infrared-trigger device that is connected to the FCU.