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DGNSS of Korea, South Korea's industrial positioning Leading to the Ministry of Maritime Affairs and Fisheries Satellite Navigation Central Office

eLoran provides internationally standardized location, navigation and timing services to be applied across the transportation sector with various applications. It is the latest version of the Loran series, which has been in use for a long time. It has been verified and could be regarded as the best product of the 21stcenturytechnology.

eLoran’s accuracy, degree of use, integrity and continuity satisfy the specifications of non-precision approach(NPA), harbor entrance and approach (HEA), vehicle navigation on land and location-based service (LBS), and at the same time it provides accurate time and frequency source for multiple fields of use such as remote communication. eLoran is an independent system from GNSS. In other words, in case of a problem with the satellite system, this enables users to use the navigation system and timing services in a stable and cost-efficient manner.

The previous model, Loran-C, with an accuracy of 460m, provided location information to the ship crew using coastal and ocean channels and ship-related workers, but with the development of GPS, with accuracy of 10m, in the 90s, Loran-C was regarded to be no longer suitable for sea navigation. However, in case the GNSS services such as GPS are shot down by their operators, it is believed that only Loran will be available to obtain location, time and navigation information.

The Loran modernization program in the U.S. helped advance Loran to a great extent. eLoran still satisfies the conditions of use of Loran-C, but at a higher degree of accuracy, integrity and continuity. Such improvement was possible through the use of additional data channels. Such data channels enabled eLoran to satisfy the high-level requirements for NPA used in landing aircrafts and for ships to move safely into harbor when visibility is bad. Furthermore, eLoran is regarded to provide very accurate time and frequency information necessary for remote communication systems such as Internet communication and carry voice.

eLoran uses high-output transmitter and low-frequency signal unlike the low-output transmitter and high-frequency signal used by GNSS. Thus, general methods of interrupting or disturbing GNSS signals such as jamming do not affect eLoran. eLoran receivers that are small and inexpensive and compatible with GNSS will reduce the impact caused by suspension of GNSS services. In addition, eLoran can perform similar functions as a compass in a static location, unlike GNSS. The newly emerging e-Navigation method in the sea navigation field requires accurate location, navigation and time information and such requirements can be satisfied through an integration of GNSS and eLoran.

- Source: U.S. Coast Guard Navigation Center