Differential Omega

From International Dictionary of Marine Aids to Navigation
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An Omega system by which the errors in information due to variations in propagation characteristics over the different paths from the stations to the vessel are determined by a fixed monitor, which then communicates this information to vessels in its immediate area (in the order of a 100 mile radius).

The errors due to propagation anomalies are thus accounted for.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM