Perhaps the frequency boundaries were put back on charts because ATC provide a traffic service to IFR in G on Area, much like FS did back in the day, and so it behoves the IFR and the traffic to be on the same frequency. How do they know what or where that frequncy is? They look at the charts. Then there is no guessing what frequency the other might be on. It's area, or CTAF if in the vicinity.
And no Dick, FS didn't monitor those non-tower airports. Our only interest traffic wise was if an IFR was arriving or departing.there. Even then, the VFR traffic that was passed was only that known to us. If there were NOSAR or SARTIME aircraft in the vicinity, the broadcasts made by the arriving/departing aircraft were meant to alert those. And guess what, they were made on area, because that's all there was. If the traffic at an aerodrome outside an AFIZ was all VFR, we didn't get involved. Our only interest with VFRs at non-controlled aerodromes was for SAR alerting or FIS, not for traffic to each other. FIS as a service in an FIA was for anyone who asked for it, or by broadcast if necessary. Directed FIS and traffic went only to some. You seem to think that FS was only there for traffic. We weren't.
Canada still does it, to some degree.
Last edited by Traffic_Is_Er_Was; 31st Dec 2017 at 10:53.