Hi Duncan,
All big jets are equipped with a thing a bit like 'Battleships', which enables us to play a game based on the old habit of sword-fighting or fencing, which all of us learnt in our childhoods, when we were growing up in our Daddies' Castles!
Now, when we call 'En guard', we are simply setting up a game between aircraft! Great fun for all the family! How we laughed on the way to the Burns Unit!
Seriously though, I would hope that any private flyer, learning that 121.5 has become the de facto loss of comms frequency for public transport, would make the sensible decision to quit the habit of practice panning. It gets in the way, and is unnecessary.