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Wind Speed

An open circle on the map indicates that there is no wind. 
So a diagonal line indicates the wind speed is at 1 to 2 knots.   
A diagonal line  with a little line coming out of it is wind speed at 3 to 7 knots.
A check mark indicates that the wind speed is going 8 to 12 knots.
A check mark with a little diagonal line indicates that the wind speed is going 13 to 17 knots.
 A check mark with a large diagonal line indicates that the wind speed is going 18 to 22 knots.
A check mark with two large lines and a little line indicates that the wind speed is at 23 to 27 knots.
A diagonal flag that is upside down indicates that the wind speed is going 48 to 52 knots.
One knot equals 1.852 km per hour.