The MultiWii flight control software has the built-in functionality of using an attached LCD for viewing and adjusting PID settings. That would make tuning PID values so much easier without connecting to the computer and use the GUI every time. Even you don’t have a LCD or OLED display, you can still do so by memorizing the steps of tuning the PID gains.
If you have a potentiometer on your transmitter, you might be also interested to this thread where people discussing the possibility of using that to tune PID values on the field.
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