Modified refractive index

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For a given height above sea level the sum of the refractive index of the air at this height and the ratio of the height to the radius of the earth.

Reference: C.C.I.R.

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


Celsius (previously Centigrade)


charge current


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