No. 490 What level of visibility does 'poor' indicate in a weather forecast?
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A
Between 5 - 8 nautical miles
B
Between 2 - 5 nautical miles
C Between 1000 - 2000m
D Less than 1000m
No. 491 How reliable are official wave forecasts considered to be?
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A
50%
B
70%
C 80%
D Almost 100%
No. 492 What is an isobar?
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A
A contour line of constant wind speed
B
A contour line of constant altitude
C A contour line of constant air pressure
D A contour line of constant visibility
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