Now we're cooking!...
Great Research Jack...I find myself...still in need of further convincing one way or the other....I may call some of my contacts tomorrow..and we have a few shows coming up...NY and Atlantic City..here on the east coast of the USA..where I can get some opinions.
To Bubbs.. point......my concern, is that we operate in daylight, darkness and in restricted visibility....the tools we use to convey our intent or status are:
Lights, Shapes, sounds........so it goes further than simply engine smoke or engine noise....if you are sailing with your engine on in neutral in the fog...which sound signal do you transmit? What lights should you display at night?
In practice...we all follow the golden rule...avoiding collision...but in theory this is good food for thought..
I know that I " Sailed" into Great Salt Pond , Block Island last summer...but had my engine on and in neutral....something I often do...I wasn't doing it to charge my batteries...but to have greater maneuverabilty if I needed it.