The Pulse-Phase Radionavigation System "Chayka" is important aid to navigation providing fixes in European Russia, Ukraine, Byelorussia, west part of Northern Route and northwestern Pacific. "Chayka" system consists of 14 stationary transmitting stations operating in four national chains. Two stations - Petropavlovsk and Alexandrovsk operate also in Russian-American Joint Chayka/Loran-C chain. Russian "Chayka" stations equipment modernization is going on. The purposes and directions of this upgrade are close to eLoran. The process of modernization will be resulted in creation of terrestrial part of integrated radionavigation system "Chayka/GNSS".
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