Thanks Nick for the reply,

THis is also what i ended up with. Exp assumes it needs to add leeway.
However this leads to other problems:
It seems that Exp adds Leeway on starboard tack ( i have high TWA) and substracts Leeway on port tack (I have low TWA). My leeway value in Exp is always negative when i let it take into account the value that comes out of the intruments. When i click the option to calculate leeway, the leeway value changes sign in each tack. I assume that this relies on the sign of the heel value.
I am not sure if the sign (+ or - } of the heel angle plays a role on that. However my heel angle in EXP is negative on port and positive on starboard, while accoridnig to the manuals it should be "Heel (roll)
is positive to starboard (sailing on port)."
This whole situtation in so confusing when trying to calibrate TWA values....and also when trying to acheive target angles and VMGs.....
 

Hi, thanks for the reply.

Expedition is connected through a Rs232 to USB cable.
I have also thougth about True Wind calculation in Expedition, which is turned off.
I also checked BSp setting in the B&G and it set to BSP. in Expedition I rememeber seeing such an option somewhere in the software but i don't remember where exactly. I will check it again.
When you say "the TWA source in the B&G system" what do you mean? Which can be the source either than the processor?