How many meters is the visibility in good weather on the sea?

Visibility is an indicator of atmospheric transparency. The aviation industry defines it as the maximum distance that a person with normal vision can see the outline of the target clearly under the weather conditions at that time. Visibility is closely related to the weather conditions at that time. When rainfall, fog, haze, sandstorm and other weather processes occur, the atmospheric transparency is low, so the visibility is poor. Atmospheric visibility can generally be measured by visual inspection, and can also be measured by measuring instruments such as atmospheric transmittance instrument and laser visibility automatic measuring instrument.

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This is the definition of visibility in encyclopedia, and visibility should be about 20 kilometers when the weather is good at sea.