In short, the DJI Fly app receives ADS-B (Automatic Dependent Surveillance-Broadcast) flight location information from planes and helicopters in the area and it even displays those them on a map.

from DJI, "they could have taken it out, seen a registration number for the drone, seen the flight path, and the location of the operator. “They could look on the map and say: ‘Right behind ...

DJI, the company that gave us the far too popular Phantom line of quadcopters, doesn’t just make the most popular line of FPV quads. Their top of the line flight controller, The Naza V2 ...