Visual calibration is required. You need to turn on the plane first, connect the plane to the computer with usb data cable, open the assistant 2 software, log in to your DJI account, click the calibration on the left, and perform forward-looking and downward-looking calibration at one time according to the prompts on the screen. After the operation is completed, the computer automatically calculates the calibration data, and the calibration is completed.