LORAN-C is a long-range navigation system that uses low-frequency radio signals to determine the position of a receiver. Developed in the 1950s, it operates by measuring the time it takes for signals from multiple ground-based transmitters to reach the receiver. This allows for accurate positioning, typically within a few hundred meters. The system was widely used for maritime and aviation navigation before the advent of GPS. Although it has been largely replaced by satellite-based systems, LORAN-C remains a reliable backup for navigation in areas where GPS signals may be weak or unavailable.