Air traffic control in flight routes, levels of assistance based on the type of aircraft, the two groups: plane flying without a device to help too much. That is, upon a vision of decision-kotasai. The other is the plane that contains the unified gauge flying devices. In this group, planes have to make plans to fly to Center and must listen to the advice constantly flying air traffic control centre, which will ensure that this binklum machine is positioned, and the proper path one at a time. A device used to control the aircraft tracking devices known as automatic. Used to signal the position of the aircraft, as chong grid coordinates and curved longitude. Adding and positioning precision is useful on routes over the ocean.
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