Expedition Expedition Navigation Software

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3/26/2022 8:14 am  #1


Apparent Wind Direction

Hello,
is it possible to add a variable to Expedition showing the apparent wind direction?

On a downwind course I'd like to be able to check with a handbearing compass if we are already affected by the wind shadow of another boat parallel to windward.

 

 

3/26/2022 9:35 am  #2


Re: Apparent Wind Direction

Wouldn't that shift be reflected in the TWD measured on your boat?
Ernie
 

 

3/27/2022 7:31 am  #3


Re: Apparent Wind Direction

No, as the wind shadow follows the apparent direction, not the true one.

When thinking a bit more about it it would also be good to have a variable “apparent wind direction on opposite tack” to judge if in or out the dirty air of a boat to leeward and behind when expecting both to gybe simultaneously.

     Thread Starter
 

3/27/2022 10:59 am  #4


Re: Apparent Wind Direction

I have looked at that in the past and had it in the 2002 AC, but am not sure I have a handle on the mathematics

 

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