I’m always interested in comparing forecast trajectories versus tracks flown – I posted some data points here.
Thanks to Kolja Packard’s excellent field report (in german and english) we have a new one – the first image in Kolja’s report shows their trajectory forecast done 22 hours before takeoff, and looking out 80 hours. This was their forecast:
![](https://blog.mah.priv.at/wp-content/uploads/2019/10/4leg-ECMWF-6h1500_18h2000_24h1500_36h4200_total-1024x617.png)
now compare that to the actual tracks flown as recorded on the Gordon Bennet Cup website:
See also the live tracking replay view.
The match is pretty phenomenal!