THE art of navigating any mobile craft depends essentially on being able to determine the position of that craft with relation to a fixed point or points; the position may either be obtained in the form of a bearing on, and a distance from, any known fixed point, or of simultaneous bearings from two or more fixed points, which bearings are laid off on a chart and denote, by their intersection, the position of the craft at the time.
Carr, C.B. (1930), "Wireless Direction Finding: A General Survey with Details of Some New Systems Recently Developed", Aircraft Engineering and Aerospace Technology, Vol. 2 No. 12, pp. 305-307. https://doi.org/10.1108/eb029347Download as .RIS
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