hans wrote:
I talked today to Filser and Becker, and they both confirmed that their
mode-S transponders will support extended quitter with GPS information
transmitted, if a GPS is connected in the near future. It will be a
software update.

They will also have to jump through a lot of certification hoops, at
least here in the US. I'd be quite happy if they can manage to do so
without requiring an expensive RAIM/WAAS certified GPS unit...

Marc