Found on YouTube. Created by "Seafarerz - shipping 90% of world trade". Originally published on 2021-04-29.
Life at Sea
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Article S-100 Charts - New Bathymetry, Surface Current and Tidal Standards
by Marine-Pilots.com - published on 14 July 2020
Video The Great Lakes-St. Lawrence Seaway Shipping System
published on 16 October 2022
The Great Lakes-St. Lawrence Seaway System is a 2,340 mile “marine highway” that extends from the Atlantic Ocean to the Great Lakes. This integrated navigation system serves mariners, farmers, factory workers, and commercial interests from the western prairies to the eastern seaboard. Today, the Great Lakes-St. Lawrence Seaway System serves as a Key Supply Chain for the world’s 3rd largest economy. Visit greatlakesseaway.org/our-system/ to learn more!