Lateral deviation

From International Dictionary of Marine Aids to Navigation
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The deviation of a ray from the great circle plane containing the point of observation and the transmitter.

Note: Such deviation can occur, for example, as a result of reflection from a tilted ionospheric layer, by reflection from a mountain or cliff or by coastal refraction.

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