SeeYou wind calculations

On Sep 27, 11:58*am, "Paul Remde" wrote:
Hi Gary,

What GPS or flight computer is the PDA and SeeYou Mobile receiving data
from?

Paul Remde

"GARY BOGGS CFIG" wrote in ...



Here in Hood River, Oregon, USA, we usually have lots of wind and
sometimes when I view the flights on SeeYou, it shows the wind very
accurately and sometimes it doesn't. *It doesn't seem to matter if
there is a lot of circling on the flight or not. *Sometimes when I
first look at the flight it doesn't show any wind and then when I view
the flight again, later there is wind shown. *Has anybody else had
this problem? *Does anybody have a suggestion for a fix?

Thanks

More like how is the .IGC file created? e.g. is it a file from a
Cambridge 302 or is it created by SeeYou Mobile. In the later case
there is TAS data in IGC file that is used by SeeYou to calculate wind
without circling. If you have plain non-TAS enhanced IGC data and
little circling then by definition SeeYou is going to have a tough
time guestimating the wind. Even if there is TAS data in the file and
sufficient heading change to calculate wind without circling it does
seem that SeeYou needs to be run forward in time to pick up that data.
If you carefully advance up to any point I expect SeeYou winds to be
consistent within reason. If not you should send a sample file to
Naviter and describe how to reproduce the problem.

Wind calculated in flight even by the same device as is creating the
IGC file may behave differently from what you see post flight. The in
flight calcs may use TAS data but that may not be available to SeeYou,
and if it is it may be at a much coarser sample rate.


Very coarse sample rates in the IGC file even when circling can also
be a problem. Even the dumbest PDA is reading GPS data many times per
second. If that is reduced to once every 10 or so seconds it can
change the wind calcs.

So what data exactly are you driving SeeYou with?
Darryl