Ventus W177 User Manual - page 12
monitor to display the wind speed in miles per hour (mph), kilometers per hour (km/h), meters per
second (m/s), knots and Beaufort. Press “WIND UNIT” on the back casing until the desired unit
appears.
The monitor displays 16 wind directions (N for north, S for south, SW for south-west and so on).
Press “WIND” to select gust & average wind speed display.
Beaufort Knots
Wave height
(meter)
Wave height
(feet)
WMO description
Effects observed on the sea
0
Under 1
-
-
Clam
Sea is like a mirror
1
1 – 3
0.07
0.25
Light air
Ripples with appearance of scales;
no foam crests
2
4 – 6
0.15 – 0.3
0.5 – 1
Light breeze
Small wavelets; crests of glassy
appearance, not breaking
3
7 – 10
0.6 – 0.9
2 – 3
Gentle breeze
Large wavelets; crests begin to
break; scattered whitecaps
4
11 – 16
1 – 1.5
3.5 – 5
Moderate breeze
Small waves, becoming longer;
numerous whitecaps
5
17 – 21
1.8 – 2.4
6 – 8
Fresh breeze
Moderate waves, taking longer form;
many whitecaps; some spray
6
22 – 27
2.9 – 4
9.5 – 13
Strong breeze
Larger waves forming; whitecaps
everywhere; more spray
7
28 – 33
4.1 – 5.8
13.5 – 19
Near gale
Sea heaps up; white foam from
breaking waves begins to be blown in
streaks
8
34 – 40
5.5 – 7.6
18 – 25
Gale
Moderately high waves of greater
length; edges of crests begin to break
into spindrift; foam is blown in
well-marked streaks
9
41 – 47
7 – 9.7
23 – 32
Strong Gale
High waves; sea begins to roll; dense
streaks of foam; spray may begin to
reduce visibility
10
48 – 55
8.8 – 12.5
29 – 41
Storm
Very high waves with overhanging
crests; sea takes white appearance
as foam is blown in very dense
streaks; rolling is heavy and visibility
is reduced
11
56 – 63
11.2 – 15.8
37 – 52
Violent
Exceptionally high waves; sea
covered with white foam patches;
visibility further reduced
12
64 & over
13.7 & over
45 & over
Hurricane
Air filled with foam; sea completely
white with driving spray; visibility
greatly reduced
(Reference table based on observations of the effects of the wind)
WIND CHILL
Wind chill is the apparent temperature felt on exposed skin due to the combination of air temperature
and wind speed. The wind chill reading on the monitor is calculated based on the temperature
measured from the anemometer (channel-1) and the average wind speed.
To change wind chill temperature unit, press “C/F” button on the back casing.
GUST WIND & WIND CHILL ALARM
High Gust Wind Alarm
You can set the monitor to sound an alarm for about 1 minute when gust wind reaches or exceeds a set