Meteorology · Visibility — Categories
In a marine weather forecast, what is the practical significance of a forecast of 'visibility 1 mile or less in fog'?
- AClear conditions suitable for full speed
- BRestricted visibility requiring the Rule 19 conduct, sound signals, and reduced safe speed under the Navigation Rules✓ Correct
- CAn indication of approaching high pressure
- DOnly a concern for aircraft
Explanation
Forecast restricted visibility triggers practical action: post extra lookouts, use radar, sound fog signals, proceed at a safe speed, and apply Rule 19 (conduct of vessels in or near restricted visibility). The meteorology directly drives the collision-avoidance regime.
Authority: WMO; Navigation Rules (Rule 19); Bowditch (Pub. No. 9)
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