"John Smith" wrote in message ...
Andy wrote:
You should also note that the documentation for current FLARM units
includes a very clear prohibition against use in the USA. One way to
enforce that probibition would be to make the units inoperable in USA

I guess the FLARM people don't care a lot whether you use the device in
the USA or not. The prohibition is purely a protection against liability
lawsuits. So if a pilot or one of his relatives should be insolent
enough and tries to start a lawsuit, they can simply point to that
prohibition and state that it's not their business.

Or if US authorized users of RF frequency of the European FLARM report to the FCC that the units interfere with their systems. There are parts of the RF spectrum that are controlled by international treaty and other parts that are allocated by country or region. The frequency allocation between countries was also an issue for the early in the cell phone industry.