jcarlyle wrote:

know, however, there are frequency band problems in the US as well as
legal problems. Indeed, a lot of what I've read indicates that the
legal issues have been responsible for stopping FLARM's introduction
into the US.

No, it's the FLARM people's fear of the US liability issues. Therefore
they (the FLARM people) explicitely forbid the use of FLARM in US
registered aircraft, in US airspace or with an US citicen on board.

Stefan