Reasons for neglect of avigation; avigational instruments and accessories, largely because of lack of demand are at very rudimentary stage of development; primary dependence in avigation must be placed in aerial dead reckoning, next in piloting, and last in astronomical observations, particularly for commercial aircraft operation.
Avigation in commercial aviation
Aero Digest
Aero Digest ; 16 , n 2
1930
2 Figs.
Aufsatz (Zeitschrift)
Englisch
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