- A transmitting device, such as a beacon, which provides a signal which is used for homing (1).
- A receiving device mounted on a moving object, such as an airplane, which follows the path provided by a homing device (1). Also, any receiving device which is guided towards the origin or point of reflection of a signal.
- A control device which automatically starts its motion or rotation in the desired direction, as opposed to doing so from a fixed point such as an extreme.
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