dumy,
That rule of hailing only on Ch.9 was a short term "experiement" a few years ago in the 1st CG District. Ch. 16 is once again the hailing channel. Anything else could create danger. Think about it. If boaters are listening to Ch. 9 because they're listening for their buddies to hail them, then they are not monitoring ch 16. It's imperative that boaters monitor ch 16, as most of time the first responder to distress calls is a fellow boater. If hailing is only on Ch. 9, then many boaters might monitor ch. 9 instead of Ch. 16 and they won't hear of other nearby boaters' distress calls.