On Jan 10, 8:34*pm, Papa3 wrote:
On Jan 10, 5:21*pm, Hal wrote:

I downloaded a flight yesterday from the Cambridge 302. *When
displaying with SeeYou there was no wind data. *The wind data was
there on a previous flight. *I assume the problem is with the 302
log. *Anyone seen this problem before?

Hal,

Others have answered, but just thought I'd clarify. *I'm assuming the
SeeYou you're talking about above is the desktop version and you were
using it for post-flight analysis (since you say "I downloaded", seems
pretty clear but just checking).

Anyway, if you look at the specs for the IGC log file, you'll see that
the only position data stored is location and time. * None of the
calculated data (such as wind) is stored. *Thus, whatever SeeYou
displays is based in post-flight calculation using only on position
and time data. * As others have pointed out, unless you have some
amount of drift in circling flight, it's impossible for a post-flight
analysis using only this position data to determine wind.

P3

Sory, this may be a common misconception, but it is not correct. IGC
files B records can contain more than position and time, including ENL
(engine noise) and the magic TAS data used for enhanced wind
calculations. And See You will use that to enhance wind calculations
just as SeeYou Mobile and WinPilog Pro uses. If your sample rate is
fast enough (1 sec?) you should get a fairly accurate replay of the
wind you PDA/computer told you existed during the flight. But yes it a
recalculation, nothing is writing pre-computed wind data to the IGC
file.

Darryl