Abstract: A computerized system for performing a simulated medical procedure, comprises: (a) a physically simulated interventional instrument that looks and feels like an endoscope, for providing user input to a computer simulated medical angioplasty procedure; (b) a motion detector circuit to provide navigation signals representative of the movement of the physically simulated interventional instrument, the motion detector comprising a laser radiation detector, used for determining the location of the interventional instrument in a predetermined area in proximity to the detector and a laser radiation emitter used for emitting a laser beam toward the predetermined area; and (c) a movement calculation unit receiving the navigation signals from the motion detector circuit, and programmed to update the position of a corresponding software simulation of the interventional instrument.

Abstract: A positioning system for positioning a movable body, such as an agricultural implement, with respect to a reference path constituted of at least one line of objects or a linear object, such as rows of crops. The system comprises a signal-echo distance-measuring device on the movable object and including a receiver for receiving an input signal representing the distance of the movable object in one direction from the reference path, and an input signal representing the distance of the movable object in the opposite direction from the reference path. The system compares both measured distances, and positions the movable object towards or away from the reference path to equalize the two measured distances.