Jean,

FLARM is a very nice concept, but it will never, ever be in the US (as
per the manufacturer's wishes). Even if it were, it wouldn't help with
the problem highlighted by the Minden mid-air, unless the manufacturer
embraces the Aussie design and allows it to interact with ADS-B. But,
ADS-B is going to take a number of years before it's in all aircraft.
So really your best bet right now to get a handle on what's in the air
with you is to get one of the collision avoidance systems mentioned at
the top of this thread, so you can keep track of the transponders most
of the powered aircraft carry.

-John

Jean wrote:
The European standard is FLARM - http://www.flarm.com/index_en.html
In Switzerland, Germany and France it looks like 75% of the ships are
equipped,