AA Butterfly versus CNv LCD wind calculation

On Monday, September 19, 2016 at 2:42:36 AM UTC+2, Sean wrote:
I thought accurate straight line glide computer wind accuracy required a fixed compass (aka LXNAv) for the best not thermaling wind detection sensitivity. My S10 is going to have a compass module shortly. But I really can't imagine a need that that much wind accuracy. The wind where you are now isn't the problem. It's accurate anticipation of what the wind is 1, 5 10 and 20 miles ahead, just like sailing, but much less critical.

Am I right or wrong on the compass module?

I believe the butterfly an fixed compass built in, and this is the reason that it is more energetic on updates? Correct?

There is no need for a compass module with S8x/S10x, the wind calculating system is doing a fine job in straight flight.
I have flown about 150h with the S80 this year, and I’m still surprised every time I take off that the wind calculation is accurate already in the tow. I measure this by comparing the wind vector before and after the first thermal after release and they are more or less the same in most situations.