Each flight must be calibrated. Look carefully at the number of available satellites (less than 11: launch at your own risk). Launch with the "flight mode" on your phone for stability and reinsurance. As much as possible, I have so far raised it to 120 meters and a distance of 200 m with a wind of 5-8 m / s, the picture is stable, but the connection at the top is not stable. For a more stable connection, I ordered antenna amplifiers.