THE practice of Air Navigation first began to be seriously considered in this country about the year 1910. Up to that time pilots had been content to follow roads and railways on their short cross‐country trips, and had quite sufficient to occupy themselves with in maintaining their machines in the air without concerning themselves with anything other than the most elementary navigation.
McMullin, C.R. (1930), "The Development of Air Navigation: Notes on the Evolution of Instruments and other Aids and their Application in Practice", Aircraft Engineering and Aerospace Technology, Vol. 2 No. 9, pp. 232-233. https://doi.org/10.1108/eb029313
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