Gten says that the V3 doesn’t need calibrating.. That might be true, but calibrating the compass is a good thing to do, and is very important as well in case of a RTL. If you use RTL and the compass orientation is not good you might get a fly away!
If you have modded your UpAir you can do simple things like calibration and change some flying modes. But the mod also gives you the opportunity to adjust the PID’s The PID’s control how the drone behaves on user input and influences from outside like wind. Every drone is different,