2021 Owner’s Manual Navigator24
BRIG ltd
6
Design Category D: This craft is designed to operate in winds up to Beaufort force 4 and the associated wave heights
(occasional maximum waves of 0,5 m height). Such conditions may be encountered in sheltered inland waters, and in
coastal waters in fine weather.
NOTE : The significant wave height is the mean height of the highest one-third of the waves, which approximately
corresponds to the wave height estimated by an experienced observer. Some waves will be double this height.
BEAUFORT Wind Scale and Corresponding State of the Sea
Beaufort
Number
Denomination
Wind speed in
Knots
Wind speed in
m/sec
State of the sea
Significant wave
height in meters
0
Calm
<1
0-0.2
Calm
0
1
Light Air
1-3
0.3-1.5
Calm
0
2
Light Breeze
4-6
1.6-3.3
Almost calm
0.2
3
Gentle Breeze
7-10
3.4-5.4
Almost calm
0.2
4
Moderate Breeze
11-16
5.5-7.9
Small waves
0.5
5
Strong Breeze
17-21
8.0-10.7
Large waves
1.25
6
Fresh Wind
22-27
10.8-13.8
Large waves
2.0
7
Strong Wind
28-33
13.9-17.1
Very large waves
2.5
8
Gale
34-40
17.2-20.7
Rough sea
4
9
Strong Gale
41-47
20.8-24.4
Very rough sea
6
10
Storm
48-55
24.5-28.4
Heavy
9
11
Violent Storm
56-63
28.5-32.6
Very heavy
14
12
Hurricane
64 and over
32 and over
Stormy
14 and over
