121.5
Probably done before but time again.
Having flown in SE Asia recently for 3 weeks I never heard ANY chatter on 121.5
But returning to OZ it is very evident that there is no appreciation as to what this frequency is really for.
To the point where 2 airline "professionals" were having a dialogue as one would expect on the "numbers".
When reminded they were chatting on guard, back came the reply " Oh here comes the guard police"!
Is this just a dunnunda thing or is it prevalent elsewhere?