The American practical navigator : being an epitome of navigation and nautical astronomy (1888)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Navigation, Cooper, Philip Henry, 1844-1912 · Washington : Govt. Print. Off. · leaf 87
uch obstacles inthe way as dangers, land, or shoals. Art. ] 30. That method of sailing answers every purpose for short voyages or within the tropical regions;but, in the present day of long voyages and great competition, much time and distance can be saved by resortingto the Great Circle track, or… … the longitude, a necessary element in the calculations, no longer exists. Again, the great labor of determininjvarious points and pricking them off on a Mercator Chart, drawing througli tliem a free-liand curve, is obviatecby the use of charts upon which all great circles are represented as…
Navigation · Nautical astronomy
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