It is an electronic component that helps us and helps in flight compensating the inertia that can have our helicopters and / or drones. In the case of helicopters, the tail gyroscope fixed, preventing autorotation and compensates the inertia of the two main rotors. In the Drones, there are 3-axis and 6, the latter being best as they facilitate control of the drones do when stationary flight (leave it alone in the air), providing extra stability to the device.