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(LOng-range Aid to Navigation)

A radio-navigation system using synchronized signals emitted by ‘master’ and ‘slave’ stations. Extensively employed for meteorological purposes by drift buoys, radiosondes, GHOST balloons, etc. The earliest version (LORAN-A) was introduced in World War II, and the later version, LORAN-C, using a much lower frequency, became widely used. Despite the challenge from satellite-based Global Navigation Satellite Systems (GNSS), such as the Global Positioning System, it has recently been appreciated that a ground-based system has certain specific advantages. An advanced form, known as ‘Enhanced LORAN’ (eLORAN, E-LORAN or LORAN-E), is therefore being introduced.

Subjects: Meteorology and Climatology.

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