MIT Series
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The Loran system is a radio aid to navigation. It provides means, independent of all other aids (including even the compass and the log or air-speed meter), for locating a moving vehicle at a given moment and for directing it to a predetermined point or along a predetermined path. There are many other radio aids by which ships or aircraft may be located or guided; these operate in accordance with various principles, and as a background to the discussion of Loran it is profitable to consider some of these principles and to describe and compare some of these aids briefly.
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