Bft |
Mph. |
Knots |
Km/hrs. |
0 |
<1 |
<1 |
<1 |
1 |
1 - 3 |
1 - 3 |
1 - 5 |
2 |
4 - 7 |
4 - 6 |
6 - 11 |
3 |
8 - 12 |
7 - 10 |
12 - 19 |
4 |
13 - 18 |
11 - 16 |
20 - 28 |
5 |
19 - 24 |
17 - 21 |
29 - 38 |
6 |
25 - 31 |
22 - 27 |
39 - 49 |
7 |
32 - 38 |
28 - 33 |
50 - 61 |
8 |
39 - 46 |
34 - 40 |
62 - 74 |
9 |
47 - 54 |
41 - 47 |
75 - 88 |
10 |
55 - 63 |
48 - 55 |
89 - 102 |
11 |
64 - 72 |
56 - 63 |
102 - 117 |
12 |
>73 |
>63 |
>117 |
|