On Sep 27, 4:38*pm, Darryl Ramm wrote:
[snip]
Darryl

What I was trying to add to my own post was...

And to be clear in my example the IGC file created by SeeYou Mobile
will contain TAS data if fed by say a Cambridge 302 which outputs TAS
data in the NMEA stream. Obviously if you feed SeeYou Mobile from pure
GPS source you don't get this. Another example is say an SN10 which
although it uses TAS for internal wind calculations does not pass it
to an external PDA for capturing to the PDA generated (unofficial) IGC
file. (Why that is escapes me.) It might capture the TAS or wind data
in it's own (unofficial) IGC file, I'm note sure. The point is the
exact providence of your data has a huge effect on the wind
calculations. For these reasons I'll often capture an official IGC
file in my C302MG (needed for OLC with a motorglider) but use the
SeeYou Mobile generated IGC file at 1 sec sample rate for analysis
because it captures TAS info for better wind calculations by SeeYou.

Darryl