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Link: Excerpt from Toronto Marine Historical Society's Scanner publication

Link: U.S. Coast Guard navigation rules

For some reason, the system wasn't letting me attach the links all in one post. I'll try sending them individually.

Link: BoatU.S. Foundation navigation sounds

You're welcome! I'm always happy to talk Great Lakes ship horns.

Some whistle signals are established and recognized by national and international shipping organizations (including the U.S. Coast Guard), while others have been developed for specific use on the Great Lakes. I attached a few links ...

Perhaps there is a location from which the Sykes and Block could be photographed at CN with the Ryerson at Fraser in the background…

Here is a link to a thread on the old Boatnerd forum with basic information about ship horns on the Great Lakes. I will include some of my own commentary below.

Steam-powered Great Lakes ships built before and during the early 1900s were equipped with steam whistles. As user Pete in Holland MI ...