On Sun, 27 Sep 2009 14:52:10 +0000, PCool wrote:

Hi Paolo,

There were no changes for wind calculations in the code, and
normally we found the wind calculation in xcsoar to be very accurate
while thermalling...but only if we have a good and correct position
reporting from gps.

Thanks for confirmation that there are no forks in the wind calculation
code.

I wouldn't expect wind calculations in cruise to be as good as my C4
since it has TAS to work with (pitot+static and an internal altimeter,
hence TAS), but I was somewhat disturbed by the 90 degree wind direction
switching and the accompanying 50% variation in reported wind speed.

Otherwise, check your gps antenna if you are not using a 31X.

It seems OK - I've never had GPS drop-outs in flight though most (all?)
XCSoar log files have at least one irregular log interval reported by
EWView when I'm reviewing the flight.


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martin@ | Martin Gregorie
gregorie. | Essex, UK
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