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LORAN
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LORAN (LOng RAnge Navigation) is a hyperbolic navigation system used for maritime and aeronautical navigation. The LORAN system was first developed during World War II, and continues in use in some parts of the world today. In the United States, LORAN was deemed to be unnecessary after the advent of GPS, and funding for U.S. LORAN stations was discontinued in 2010.
The earliest version of LORAN, LORAN-A, used frequencies in the 1.7-2 MHz range. LORAN-B was an improved variant of LORAN-A. LORAN-A operations in the United States were shut down in 1980. LORAN-C, components of which are still in operation, uses a frequency of 100 kHz, but the pulsed nature of the emissions spread the occupied band to roughly 90-110 kHz. LORAN-D was a shorter range/higher accuracy tactical system.
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Frequencies |
| Frequency | Bandwidth | Use | Service | Table |
| 100 kHz | 20 kHz | LORAN-C | Radionavigation | F |
| 1750 kHz | 20 kHz | LORAN-A (historic) | Radionavigation | F |
| 1850 kHz | 20 kHz | LORAN-A (historic) | Radionavigation | F |
| 1900 kHz | 20 kHz | LORAN-A (historic) | Radionavigation | F |
| 1950 kHz | 20 kHz | LORAN-A (historic) | Radionavigation | F |
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