The Extreme Range is the maximum distance at which an object of a given height may be seen at sea.
This distance will be equal to the sum of visibility distance of the object height H [m] and distance to the visible horizon, proper to observer height h [m].
In some nautical documents, visibility distance of various objects is given for a standard observer height of 5 meters.
The visibility distance of an object can be of two kinds:
· Distance of Geographical Visibility, and
· Distance of Optical Visibility.
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