One easy example I can think of in the UK is uncontrolled/semi-controlled airspace (class E/G) and uncontrolled airfields. Parties transmitting on those frequencies are basically sending broadcast messages for the benefit of anyone listening in order to inform those unknown parties of their location and intentions.
See also, for example, this reply to an FOI request[1], I quote:
Whether or not an aeronautical transmission was intended for
general reception would depend on all of the circumstances of the
transmission. We cannot therefore say, generally, whether or not
listening to these transmissions would be an offence.
Not quite so black and white.
One easy example I can think of in the UK is uncontrolled/semi-controlled airspace (class E/G) and uncontrolled airfields. Parties transmitting on those frequencies are basically sending broadcast messages for the benefit of anyone listening in order to inform those unknown parties of their location and intentions.
See also, for example, this reply to an FOI request[1], I quote:
Whether or not an aeronautical transmission was intended for general reception would depend on all of the circumstances of the transmission. We cannot therefore say, generally, whether or not listening to these transmissions would be an offence.
[1] https://www.whatdotheyknow.com/request/air_band_listening_an...