Robert Ehrlich wrote:
Marc Ramsey wrote:

... It did not examine whether airborne collision
avoidance systems would continue to provide warnings when confronted by
such situations.
...

The only such system I have heard about is TCAS. As far as I know
this system is not available on gliders, only on big airplanes
carrying passengers or military ones. It should emit hints to the

I've seen a $20,000 version of TCAS, with a graphic display and
altitude displayed, in an acquantence's 182. It seemed a little
big for a glider (display the size of a Garmin 430). And
my goodness I can only imagine the power consumption!