Nominal Range

From International Dictionary of Marine Aids to Navigation
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Nominal Range (of a light)

The nominal range of a light used as an aid to marine navigation is its luminous range in a homogeneous atmosphere in which the meteorological visibility (2-1-280) is 10 sea-miles.

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