It is federal law that all vessels having engaged in international maritime will use a licensed professional pilot upon entering the Great Lakes Seaway System. Pilotage is provided by several private pilotage associations but overseen by governmental offices. Canadian pilots are overseen by the Great Lakes Pilotage Authority and U.S. pilots are overseen by the Great Lakes Pilotage Office under the USCG. Pilotage is generally arranged by the vessel agents. However, you may contact the following agencies regarding pilotage regulations:

Canadian Great Lakes Pilotage Authority

P.O. Box 96
Cornwall, Ontario Canada
K6H 5R9

Office of Great Lakes Pilotage

U.S. Coast Guard Headquarters
2703 Martin Lurthern King Jr. Ave SE
Washington, DC 20593-7509

U.S. Federal Regulations regarding Great Lakes Pilotage are located under 46 CFR Chapter III, Parts 401-499.

The Great Lakes Pilotage Advisory Committee (GLPAC)

Governance Options for Safe, Reliable and Competitive Pilotage Services in the US Waters of the Great Lakes

View it here.