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Published online by Cambridge University Press: 18 January 2010
In the early days of air navigation, dead reckoning procedures were inevitably closely allied to those practised at sea, but the rapid development of aviation has considerably reduced these early similarities. To talk generally of D.R. practices is therefore no longer feasible. It is the purpose of this article to outline some of the air procedures and instruments in use, and to give an indication of the reason that lay behind their adoption.