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Weather & Water

Visibility

Technical visualVisibility
VisibilityA vessel and channel mark fade progressively behind three layers of mist.vesselline of sight
VisibilityA vessel and channel mark fade progressively behind three layers of mist.121vessel2line of sight
Visibility is the greatest distance at which an object can be seen and identified; report and use the observed value for the conditions.

The distance at which objects can be seen and identified under prevailing conditions.

Fog, precipitation, smoke and haze can reduce it.

Navigation Rules warning: "restricted visibility" does not have a universal single numerical cutoff. A reported one-mile visibility value should inform seamanship, not act as a binary COLREG switch.

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