What will you do when you have an FD1 with “geomagnetic calibration” error and the error and won't go away. 

Please check and do the items as blow.

（1） Change an environment to test it. This prompt appears by the magnetic field interference of the flight environment。

（2）When you install the battery,please keep the battery cable away from the shielded cotton on the top of the aircraft.The battery will generate a magnetic field during work. Once the cable is exposed to the top cover, the magnetic field of the aircraft will be interfered.

（3）The aircraft prompts the magnetic calibration is a prompt to ensure the safe flight of the aircraft, please calibrate the compass。

Please calibrate all items as the user manual before flying. You can get more information from our support website.

https://support.swellpro.com/hc/en-us/categories/5581791242905-Fisherman-FD1-

（4）If you still can't fix it, please feel free to contact our support service.