I tried to fly a phantom 4 at local outdoor event and discovered it was blocked due to the location being deemed a red zone due to the local missile defense field. Months later, when I heard the local kids flying club was going to fly their quads at the same location, I was puzzled, so I attended. The meet was indoors. The drones all flew nicely stable, hovered well, indoors inside the gymnasium, inside the FEDERAL RED ZONE. My question is how does the drone talk to GPS to locate itself, and hover, yet not realize it is within the RedZone? Puzzled???