| BEAUFORT | KNOP | Km/h | MPH | m/s |
| 1 | 1-3 | 1-5 | 1-3 | <2 |
| 2 | 4-6 | 6-11 | 4-7 | 2-3 |
| 3 | 7-10 | 12-19 | 8-12 | 4-5 |
| 4 | 11-16 | 20-28 | 13-18 | 6-7 |
| 5 | 17-21 | 29-38 | 19-24 | 8-10 |
| 6 | 22-27 | 39-49 | 25-31 | 11-13 |
| 7 | 28-33 | 50-61 | 32-38 | 14-16 |
| 8 | 34-40 | 62-74 | 39-46 | 17-20 |
| 9 | 41-47 | 75-88 | 47-55 | 21-24 |
| 10 | 48-55 | 89-102 | 56-64 | 25-28 |
| 11 | 56-63 | 103-117 | 65-73 | 29-32 |
| 12 | >64 | >118 | >74 | >33 |