This paper describes the genesis, the principle of operation and characteristics of selected\nradio-navigation positioning systems, which in addition to terrestrial methods formed a\nsystem of navigational marking constituting the primary method for determining the location\nin the sea areas of Poland in the years 1948ââ?¬â??2000, and sometimes even later. The major ones\nare: maritime circular radio beacons (RC), Decca-Navigator System (DNS) and Differential\nGPS (DGPS), as well as solutions forgotten today: AD-2 and SYLEDIS. In this paper, due\nto its limited volume, the authors have omitted the description of the solutions used by the\nPolish Navy (RYM, BRAS, JEMIOÃ?ÂUSZKA, TSIKADA) and the global or continental\nsystems (TRANSIT, GPS, GLONASS, OMEGA, EGNOS, LORAN, CONSOL) - described\nwidely in world literature.
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