Loran-C is a long-range radio navigation system that was developed in the 1950s. It uses low-frequency radio signals transmitted from a network of ground stations to help ships and aircraft determine their position. The system provides accurate location information over distances of up to 1,500 kilometers. Loran-C operates by measuring the time it takes for signals to travel from multiple transmitters to a receiver. This time difference allows the receiver to calculate its position using a method called triangulation. Although it has been largely replaced by GPS, Loran-C was widely used for maritime and aviation navigation for several decades.