What your all forgetting is that dear old Don applies two basic rules to
flying.
1st Always fly in the middle of the air. The extremities can be very
dangerous, there you will find Land, Tree's, Mountains, Water, Space and
Other Aircraft
2nd If you hear a loud bang you know you've hit something.

Therefore he doesn't need FLARM

Phil :-)


Chris Reed wrote:
Don Johnstone wrote:
Unless 100% of gliders have
it installed it cannot be effective

If 99% of gliders had it installed, and there were 100 other gliders
flying in the area, the risk of not being aware of one would be
decreased by 99%. If 50%, risk decreased by 50%.

Not as effective as if 100% had FLARM installed, but surely not
completely ineffective?

I'm not (yet at any rate) planning to install FLARM for flying in the
UK, but would if I flew in the Alps. I can use a 50%+ improvement in my
chances of spotting other aircraft.