Great Lakes and Inland Waters

Great Lakes for the purpose of calculating service requirements for an officer endorsement, means the Great Lakes and their connecting and tributary waters including the Calumet River as far as the Thomas J O’Brien Lock and Controlling Works (between mile 326 and 327), the Chicago River as far east side of the Ashland Avenue Bridge (between mile 321 and 322), and the Saint Lawrence River as far east as the lower exit of the Saint Lambert Lock. For purposes of requiring merchant mariner credentials with rating endorsements, the connecting and tributary waters are not part of the Great Lakes.

Inland Waters means the navigable waters of the United States shoreward of the Boundary Lines as described in 46 Code of Federal Regulations (CFR) Part 7, excluding the Great Lakes, and, for towing vessels, excluding the Western Rivers. For establishing credit for sea service, the waters of the Inside Passage between Puget Sound and Cape Spencer, Alaska, are inland waters.