Martin, I was referring to the obvious requirement for each "tracked" US glider to contain a nearly $2000 USD powerFlarm device, not the cost of the Flarm radar antenna. The folks here in the US are often quite sensitive to that cost and feel that Flarm leeching is a suitable means of winning competitions. Yes, really.

http://www.craggyaero.com/powerflarm_core1.

I have a question for you. Is Flarm "required" in Europe or optional? If so, what are the penalties for non-compliance? If not unanimous, what European countries require Flarm, and what countries do not? Thx.

Sean