Expedition Navigation Software 
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- Expert
Offline - Registered: 12/20/2015
- Posts: 93
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.
- Ernie M
- Moderator
Offline
- Registered: 11/05/2015
- Posts: 422
Re: Apparent Wind Direction
Wouldn't that shift be reflected in the TWD measured on your boat?
Ernie
- nav
- Expert
Offline
- Registered: 12/20/2015
- Posts: 93
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- Nick
- Moderator
Offline
- Registered: 9/16/2015
- Posts: 3,300
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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