The pan axis of your Helix drifts visibly, but only when the joystick or RC controller is connected to it.
This is a problem with the trimming of the RC controller or joystick. If you are using an RC controller, make sure that you trim the RC radio in accordance with your radio’s manual. If you are using a joystick, you must do this from within the SimpleBGC GUI or the iOS app. The SimpleBGC GUI is simpler and the recommended method for doing this. To trim it, you can:
Connect to your Helix with the SimpleBGC GUI.
Go to the RC tab.
Scroll down until you see the section marked “RC Sub-Trim”
Press the AUTO button.
Hit the Write button.
The Helix drifts in a slow, but visible manner, even without a joystick or RC controller connected
This is usually caused by a gyro that needs to be calibrated. You can calibrate these in either the iOS app (orientation/calibration screen) or the SimpleBGC GUI (IMU calibration helper). The iOS app is the easier way to do this.