IN the 'industry', when 'committing aviation' and you heard a colleague 'on air', the usual inviting transmission was - 'See U on the Numbers' - and the response was simply a 'click click' on the button.....
The 'numbers' being 123.4....And one went there to exchange the 'local goss'.... UNTIL they became a 'frequency' somewhere....
In WA, the Newman Area Freq became 123.4, so that stopped that, unless the guys and gals (In WA) KNEW that, and they were far enuf away so as not to....interfere?
119.1 was an 'Aero Club' freq. in the 'ole days' and used similarly....
Don't know about ICAO being consulted though....
Cheers
