I had a phantom 3 before my Mavic Pro. I flew the phantom a lot and just let it go to see how far it would fly. I have a lot of interference and I think 4k ft was pretty much the max. At that distance I could not see it and it always returned to me. With the Mavic I am afraid to send it out for fear it will not come back. I've really only done a few line of sight flights. Each time I've gone farther and farther. So how do I learn to trust the range?