4df8 Drone Manual | _verified_

Dual positioning allows the drone to hover steadily outdoors (GPS) and indoors (Optical Flow).

If your drone drifts to one side without input, you must calibrate the gyroscope. Gyro Calibration: 4df8 drone manual

Accessed through the app, this allows the drone to lock onto your smartphone's GPS signal and follow you autonomously. Dual positioning allows the drone to hover steadily