11.8.1 Navigation with bad weather conditions

It is very important during navigation in harsh weather, to make sure that all pieces of furniture, hatches, and mobile parts, are duly fastened or stowed, to avoid damages and above all to avoid hurting persons on board.

The reliability of machinery assumes even greater importance in adverse weather conditions.
The following table shows the maximum speed allowed in function of the wave height, in order to safeguard the yacht structural integrity.

Speed (knots) Wave height in metres
10 0,80
11 0,70
12 0,63
13 0,56
14 0,51
15 0,47
16 0,43
17 0,39
18 0,37
19 0,34
20 0,32
21 0,30
22 0,28
23 0,27
24 0,26
25 0,24
26 0,23
27 0,22
28 0,20
29 0,20
30 0,19
31 0,19
32 0,18
33 0,17
34 0,17
35 0,16
36 0,16
37 0,15
38 0,15
39 0,14
40 0,14
WARNING

RIVA declines all responsibility for the improper use of the yacht, in relation to the wave height conditions.

WARNING

Before undertaking navigation, it is necessary to be aware of the sea and weather conditions you will find along the transfer route and in the area you want to reach.

Beaufort
Scale		 Descriptive
Term		 Wind speed Probable wave
Height (metres)
m/sec knots average max
0 Calm 0 - 0,2 up to 1 - -
1 Light air 0,3 - 1,5 1 - 3 0,1 0,1
2 Light breeze 1,6 - 3,3 4 - 6 0,2 0,3
3 Gentle breeze 3,4 - 5,4 7 - 10 0,6 1,0
4 Moderate wind 5,5 - 7,9 11 - 16 1,0 1,5
5 Gentle wind 8,0 - 10,7 17 - 21 2,0 2,5
6 Fresh wind 10,8 - 13,8 22 - 27 3,0 4,0
7 Strong wind 13,9 - 17,1 28 - 33 4,0 5,5
8 Gale 17,2 - 20,7 34 - 40 5,5 7,5
9 Strong gale 20,8 - 24,4 41 - 47 7,0 10,0
10 Storm 24,5 - 28,4 48 - 55 9,0 12,5
11 Violent storm 28,5 - 32,6 56 - 63 11,5 16,0
12 Hurricane over 32,7 over 64 14,0 -