Abstract
ORDINARY navigation may be broadly divided into two kinds: coastal navigation, in which, shaping his course by compass, the mariner verifies his position by cross-bearings of two terrestrial objects, by two objects in transit and the bearing of a third object, and by various other methods; and navigation of the open sea, with no lights or headlands available, so that he has to depend wholly upon celestial observations. With regard to long voyages of the second type, but little progress has been made in air matters, difficulties as to obtaining a satisfactory horizon having so far proved insuperable. It is upon the development of directional wireless that the hopes of the airmen are fixed in connection with long-distance aviation in the immediate future.
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