B&G Vulcan Series, Operator'S Manual, Page: 165 / 198

Weather
The system includes weather functionality that allows the user to
view forecast data overlaid on the chart. This helps gaining a clear
understanding of the weather conditions that are likely to appear.
The system supports weather data in GRIB format, available for
download from various weather service suppliers.
Wind barbs
The rotation of the wind barbs indicate the relative wind direction,
with the tail showing the direction the wind is coming from. In the
graphics below, the wind comes from the northwest.
Wind speed is indicated by a combination of small and large barbs
at the end of the wind tail.
Zero knots / Indeterminate wind direction
Small barb = 5 knots
Large barb = 10 knots
Arrow barb = 50 knots
If a combination of 5 and 10 knot barbs are shown on a tail, then
add them together to give you the total wind speed. The example
below shows 3 x large barb + 1 x small barb = 35 knots, and 60
knots indicated with 1 x arrow barb + 1 x large barb.
Wind speed: 35 knots
Wind speed: 60 knots
Showing weather details
If pop-up is enabled, you can select a weather icon to display the
identity of the observation. If you select the pop-up, detailed
information about the observation is displayed. You can also display
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Weather | Vulcan Series Operator Manual
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