Transponders are also not interoperable – notably, with things that can’t carry enough battery and/or can’t install it, as well as not being interoperable with other transponder-carrying aircraft unless they have TCAS or PCAS or something like it, or ATC and a totally known environment.
chirsN. Many thanks. Your post is exactly how i see the situation to date. You have seem to posses an in depth knowledge of the Flarm system please let us know all you can.