Preparations for Shipping Season in Full Swing

Great Lakes and Seaway Shipping details the preparations of the Coast Guard for opening up for the shipping season. The warm spring weather will aid in the opening. Its 32 degrees in the Sault right now so spring must be coming. I'm looking for a method to see what ships are in the St. Marys River system because boats are relying less on scanner communication than before. Any ideas out there?
For the web article, to to the above link and look under News Channel for Sunday, March 22.

U.S. Coast Guard to open West Neebish Channel