DEVONPORT AND JACOBS WELL
Onya Frank!
Good reminder in post #7 Check Thrust.
There was a section on satellite based ADS/B in a 2006 paper prepared in Australia. None of the peer reviewers in CASA or AsA made adverse comment on the concept.
Pays to have a decent filing system and (despite the advancing years) some semblance of memory.
MJG
Back in Paradiise but still on line and trying to keep some folk honest.