"Colin Wray" wrote in message
...
Anyone with a non-updated Flarm will be well aware that it is not working
because there will be (unit-dependent) positive indications of the problem.

Precisely! And those with updated Flarm will not know that the other are not
working.
Here's the song about the brave pilot with its updated and working Flarm,
that cannot "see" the others.

Where have all the gliders gone,
long time passing?
Where have all the gliders gone,
long time ago?
Where have all the Flarms gone?!?
Need to update, every one!
When will they ever learn,
when will they ever learn?

(Pete Seeger)