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Old 04-06-2018, 06:44   #376
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Re: Sean Depagnier's Plugins

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Originally Posted by boat_alexandra View Post
There is no error. The video gives the same description as in the actual plugin which is exactly what the display is. Each barb is 5 knots of wind.

The description you listed came from somewhere else. Should the plugin use beaufort scale instead?
The image I uploaded is from the Pilot Charts of the world. And yes, the Beaufort scale is what the barbs display and should be used.

Five barbs means Beufort scale of 5 which is a fresh breeze of 17-21 kts.

https://en.wikipedia.org/wiki/Beaufort_scale

Sorry, but I think it's best to be accurate.

Terry
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Old 04-06-2018, 08:23   #377
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Re: Sean Depagnier's Plugins

I just wanted to point out, it is not an error in the video. Climatology plugin always used 5 knots per barb, and was documented this way.

I can change to beaufort scale, but I personally find it more confusing... before I could just multiply the barbs by 5. What is the advantage other than to conform to other pilot charts?

I will likely make this a display option (checkbox) for wind atlas. The question now, is which default value to use.
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Old 04-06-2018, 17:35   #378
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Re: Sean Depagnier's Plugins

Quote:
Originally Posted by boat_alexandra View Post
I just wanted to point out, it is not an error in the video. Climatology plugin always used 5 knots per barb, and was documented this way.

I can change to beaufort scale, but I personally find it more confusing... before I could just multiply the barbs by 5. What is the advantage other than to conform to other pilot charts?

I will likely make this a display option (checkbox) for wind atlas. The question now, is which default value to use.

For us older sailors that used Pilot Charts for route planning (as I did with a stack of heavy paper) and then had the convenience of the VPP program, we are used to the traditional wind rose. But I doubt if many sailors today have ever viewed the paper Pilot Charts.

Using 5kts per barb overstate the wind.strength a bit. Using the Beaufort scale the number of barbs equates to wind strength as:

Barbs Wind strength(kts)

3 7-10
4 11-16
5 17-21
6 22-27
7 28-33

And since these wind strengths are averages over many years its foolish to think that's what you will find. So the scheme of multiplying the number of barbs by 5 is a good approximation and yes, a lot more convenient for the sailors of today.

Don't change anything.

It's just that using the same graphic as the traditional wind rose caught my attention since I'm probably one of the few who spent hours pouring over those wind roses and used the Beaufort scale as the intuitive strength (which I would be surprised to encounter).

So we can this one under the rug.

(Never thought I'd find a use for that emoticon!)

Terry
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Old 04-06-2018, 19:02   #379
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Re: Sean Depagnier's Plugins

Sorry Sean, I should have noticed that difference.
I think you should have an option checkbox to show wind in Beaufort and keep the plugin default as it presently exists.
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