I've been using XCSoar on an Android with a CAI-302 for almost 3 years now
and the wind calculation/display works perfectly.

If you tecchies would look outside once in a while instead of at your
whiz-bang panels, you could compare the wind velocity arrow to the cloud
shadows. Oh, wait! That would be too much like pilotage.



"jfitch" wrote in message
...
On Monday, July 15, 2013 3:44:56 AM UTC-7, Max Kellermann wrote:
On Sunday, July 14, 2013 8:08:50 PM UTC+2, jfitch wrote:

Got a question: the Butterfly wind vector and the XCSoar wind vector
(derived from Butterfly information) seem to disagree by 180 degrees.
That is they point toward each other. XCSoar seems to believe it too,
based on glide calculations. I am using the LX format output on the
Butterfly. I am assuming the arrow on each is intended to point the
direction the wind it blowing towards, I.e., a vector. From observation,
the Butterfly appears to be correct, XCSoar 180 off. Has anyone seen
this?



This sounds very much like the Butterfly firmware bug that was reported to
the XCSoar bug tracker 4 months ago:



http://bugs.xcsoar.org/ticket/2660

I will get to the bottom of this. Please tell me, what is the assumption of
XCSoar?

In particular, a CAI 302 !w sentence that looks like this:

!w,180,30,5,,,,,,,,,,*hh

would be interpreted how? Wind blowing from north towards the south, or
south towards the north?
(my interpretation of the description "vector wind direction in degrees"
indicates from north to south)

In an LX mode, an $LXWP0 sentence that looks like this:

$LXWP0,,,,,,,,,,180,3*hh

would be interpreted how? Wind blowing from north towards the south, or
south towards the north?
(description is less clear, "windcourse" would seem to mean same thing as
Cambridge)


How does one get access to the XCSoar forum and bug reporting scheme? I
registered over the weekend, but my registration is being held I guess.