Does the phantom joysticks operate on a line of sight basis? If you have a FPV setup, is it possible to navigate one in between buildings in a city, or say explore multiple rooms in a large open building such as a warehouse? Or do you need to maintain a line of sight in order to not lose signal? I was just curious because it seems almost all the videos I see featuring a phantom follow this process: Start rotors-> fly straight up-> drift around while turning the camera-> land. I've never seen one fly up, over something, and lower itself on the other side while exploring. I really think it would be incredible if you were able to set one up with FPV and say fly up over a thick tree canopy and then duck down inside through an opening to have a look around. Sadly I am starting to think this is not possible. Also, about the GPS return home feature: Does it follow a 3 dimensional route back to the start, essentially retracing its steps? Or does it just register the starting location, and take a straight line, unchanging elevation route back to the home point? If I were to register the home point, fly down my street and turn at the corner passing a line of trees, and then cut the power to the controller, would the phantom fly right into the line of trees when trying to reach the home location? Or does it retrace its steps?