It seems that according to part 107 a visual observer can be used to maintain a line of sight on the vehicle, as long as the PIC and the VO are in communication. It also seems that there is no limit on where this VO can be, as long as a VO or the PIC
I've been trying to find a simple roll compensating gimbal (single axis or compact 2 axis) to mount a camera inside a payload bay. It seems if you want to use anything larger than a GoPro the gimbals are huge 2 and 3 axis things.
I've been looking everywhere to try and find out if you have to have a ground control station set up to fly missions. Since the waypoints are sent to the pixhawk through usb and are stored as gps coordinates I didn't think it needed to communicate wi