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LORAN (short for LOng RAnge Navigation) is a hyperbolic radio navigation system. LORAN-C was the predominant LORAN system in use but in recent years eLORAN, or E-LORAN (Enhanced LORAN) has been replacing obsolete LORAN-C systems. However, eLORAN has not been able to catch on as well as GPS systems become cheaper and more accessible to users, so eLORAN systems have begun to shut down.