Abstract :
The paper follows naturally on those of W. Ross¿ and R. G. Stansfield, drawing attention to the necessity for a statistical bearing-classification method, as described by the former author, in order to make possible the practical application of the theory of direction-finding ¿fixes¿ put forward by the latter. The general problem of ¿fix¿ interpretation is stated and the nature of its mathematical solution is indicated in simple terms. A brief account is then given of one very simple method of practical application of the theory which was used with success during the war. A description is also given of a promising mechanical-electrical statistical plotter which was in course of development at the termination of the war. Finally, attention is drawn to the possibility of introducing, with advantage, similar methods of interpreting the observations in modern radio navigational aids.
