Why do toy helicopters have to constantly control the direction when hovering, while drones can hover automatically without manipulation?

Ordinary toy helicopters rely on gyroscopes to keep the plane stable. Better still, they have barometers to control the height of the plane, but neither of these methods can make the plane hover accurately in the air.

Professional UAVs, such as DJI series, are accurately selected through the gps positioning module in the fuselage in most cases, and there will be a visual assistance system to hover stably according to the surrounding environment.