Today's complex systems use multiple approaches to determine current position. ) or track movement from a known position/starting point (e.g. landmark, north star, LORAN Beacon), relative position to a target (ex. Navigation aids either measure position from a fixed point of reference (ex. Navigation is the art of determining where you are, a science that has seen tremendous focus in 1711 with the Longitude prize. Guidance, navigation, and control systems consist of 3 essential parts: navigation which tracks current location, guidance which leverages navigation data and target information to direct flight control "where to go", and control which accepts guidance commands to affect change in aerodynamic and/or engine controls. See also: Missile guidance and Precision-guided munition ยง Types Control refers to the manipulation of the forces, by way of steering controls, thrusters, etc., needed to execute guidance commands while maintaining vehicle stability.Navigation refers to the determination, at a given time, of the vehicle's location and velocity (the " state vector") as well as its attitude.Guidance refers to the determination of the desired path of travel (the " trajectory") from the vehicle's current location to a designated target, as well as desired changes in velocity, rotation and acceleration for following that path. ![]() In addition, sophisticated applications of GNC enable automatic or remote control. Even in cases where humans can perform these functions, it is often the case that GNC systems provide benefits such as alleviating operator work load, smoothing turbulence, fuel savings, etc. Therefore, systems-now almost exclusively digital electronic-are used for such control. However, because of the speed of, for example, a rocket's dynamics, human reaction time is too slow to control this movement. ![]() ![]() In many cases these functions can be performed by trained humans. Guidance, navigation and control (abbreviated GNC, GN&C, or G&C) is a branch of engineering dealing with the design of systems to control the movement of vehicles, especially, automobiles, ships, aircraft, and spacecraft.
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