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Discussion Starter · #2 ·
Without the proper instrumentation, reading the water is your best clue.

Chapmans has information regarding the Beaufort wind scale and offers some guidance regarding how the water looks under various wind velocities.

Fairwinds,

Jim
 

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Discussion Starter · #4 ·
From the Mariner''s Book of Days:
Less than 1 kt - smoke rises vertically
1-3 kts - smoke drifts
4-6 kts - wind felt on face
7-10 kts - light flag extends from pole
11-16 kts - wind raises dust, cinders, loose paper, etc.
17-21 kts - flag waves and snaps briskly
22-27 kts - wind whistles in rigging
28-33 kts - walking against wind is difficult
34-40 kts - wind impedes progress
 
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