Loran-C, the successor to Loran-A,  was originally developed to provide radionavigation service for U.S. coastal waters and was later expanded to include complete coverage of the continental U.S. as well as most of Alaska. Twenty four U.S. Loran-C stations work in partnership with Canadian and Russian stations to provide coverage in Canadian waters and in the Bering Sea. Loran-C provides better than 0.25 nautical mile (460 meters) absolute accuracy for suitably equipped users within the published areas.

Users can return to previously determined positions with an accuracy of 18 to 90 meters using Loran-C in the time difference repeatable mode. Advances in technology have allowed greater automation of Loran-C operations. New technology has allowed the United States Coast Guard to establish centralized control of the continental U.S. Loran-C system at two locations. The application of new receiver technology has improved  the usability of the system. A majority of the 1.3 million Loran sets in use worldwide are for mariners. Loran-C is greatly appreciated by the US general aviation community with some 80,000 aircraft now equipped with the system. For further details, please select one of the following catagories:

Signal Characteristics
Transmitters and Coverage
Canadian Loran 'C' Stations
Future Developments

Loran-C operates in the 90 to 110 khz  band, uses pulse-time and phase-difference as its operating principle and the day/night range is 1200/2400 nm typical.

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July 3/12