INSTRUCTIONS FOR USE AND WARNINGS
13
Conditions for using the equipment in case of wind
The equipment can also be used if wind is present, provided it does not exceed Grade 6 of the Beaufort Scale
(speed 45 km/h; 28 mi/h; 12.5 m/s);
For visual identification of this speed, refer to the Beaufort Scale below for empiric evaluation of the wind speed.
BEAUFORT WIND SCALE
Force
speed
(km/h)
speed
(mi/h)
speed (m/s)
wind type
wind effects
0
0-1
0 < 1
> 0,3
Calm
smoke rises vertically;
sea surface mirror-like.
1
1-5
1 – 4
0,3 - 1,5
Light air
wind causes smoke to drift;
ripples on water.
2
6-11
5 – 7
1,6 – 3,3
Light breeze
leaves rustle; small wavelets.
3
12-19
8 – 11
3,4 – 5,4
Gentle
breeze
leaves and twigs constantly moving;
large wavelets, crests begin to break.
4
20-28
12 – 18
5.5 – 7,9
Moderate
breeze
the wind raises dust, dry leaves,
small tree branches constantly
moving; small waves becoming
longer.
5
29-38
19 – 24
8 – 10,7
Fresh breeze
small trees in leaf begin to sway;
small waves are formed in
internal waters; waves become
moderately longer.
6
39-49
25 – 31
10,8 – 13,8
Strong
breeze
larger tree branches moving,
whistling heard in telegraph wires;
whitecaps on the sea surface
and spray.
7
50-61
32 – 38
13,9 – 17,1
Near Gale
whole trees moving, resistance felt
when walking against wind;
sea heaps up, white foam streaks of
breakers.
8
62-74
39 – 46
17,2 – 20,7
Gale
twigs breaking off trees, walking
against wind becomes impossible,
moderately high waves of greater
length, edges of crests begin to break
into spindrift.
9
75-88
47 – 54
20,8 – 24,4
Strong Gale
shingles and tiles blown away;
high waves, dense streaks of foam
and spray, raised by wind reduce the
visibility.
10
89-102
55 – 63
24,5 – 28,4
Storm
seldom experienced on land,
trees uprooted, considerable damage
to dwellings; very high waves with
long overhanging crests.
11
103-117
64 – 73
28,5 – 32,6
Violent storm
rare, very severe devastation;
enormous high waves, which can
conceal medium sized ships;
visibility reduced.
12
beyond 118
74 +
32,7 +
Hurricane
destruction of buildings, constructions
etc.; foam and sprays in the seas
reduce visibility to a very great extent.