Smaller drones generally don't have the processors that their big brothers and sisters carry.
So you need to actually fly it, hands on. But that's the whole idea, to learn how to fly. Right?
Trim tabs are to keep the drone flying in the true direction you send it.
For instance, if you were hovering and it was drifting to the left, you can use the trim tabs to bring it back right, to centre. For Fine correcting adjustments, when it works correctly.
We have GPS in the Phantom so they are much more steady in the air. Now if you switch your Phantom 3 into ATTI mode, you will need to be more attentive and aggressive on the sticks in keeping it controlled. Good to practice this, for when the satalites actually do go out... ;-)
When you let go of the sticks now, it generally stops pretty fast. In ATTI mode, you need to push or pull back on the stick softly, in the opposite direction, in order to stop it traveling. As well, good to be aware of the wind, as it will drift your drone much easier, with the moving air currents, without a proper GPS lock.
Have a go with the onboard flight SIM program, and try out various scenarios. Practice pain free, and learn how different scenarios, can be corrected that will make your drone flying safer, more fun for you and with much less stress, worry-less. ;-)
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