Asbjorn Hojmark wrote: [snip] "You want the powered aircraft to use it
also?
And you know that FLARM actually works at those speeds?"

I, and no doubt others, would like to know the answer - but if it does
not at present work at those speeds, could it be developed so that it
does?

If it does or could, it certainly seems to me to offer a better
potential solution than Mode S (or A or C) for glider/glider collisions
- which transponders do nothing for - and glider/GA - which
transponders do little or nothing for, depending on whether they have
ATC contact (if ATC have not suppressed the glider transponder signal),
and/or ACAS (which few GA aircraft have), and/or collision avoidance
(which not that many GA have either) - an awful lot of if's. Oh, and I
understand that UK military have neither TCAS/ACAS nor other collision
avoidance, and many/most have no transponder either.

Chris N.