One of the most important requirements throughout history for trade and wars is the ability to determine one’s position and destination. A number of techniques and tools have been developed to know the position and the direction headed in caravans travelling in far away regions and ships in the open seas. Developments in electronic and space technologies in the 20th century proved to be significant breakthroughs in this field.
Using the position of stars, sextant and similar techniques for navigation were accompanied by radio navigation from 1930s onwards. The working principle of radio navigation is that the receiver in the aircraft receives signals emitted from ground radio stations and determines its position, direction and distance. It has played a great role in the development of military and civil aviation. Thus, long-distance flights became available.
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