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Where does my Great Lakes USCG license work?

Updated: Sep 7

Any officer endorsement issued for service on Great Lakes and inland waters self-propelled vessels, excluding towing vessels, is valid on all of the inland waters of the United States as defined in 46 CFR 10.107 and described below.



In the hierarchy of coast guard licenses, Great Lakes, is higher than Inland. This means that a 100 GRT Master Great Lakes can operate, within the bounds of the license, on Inland waters. However, a 100 GRT Master Inland is not allowed to operate on the Great Lakes as a 100 GRT Master.


What is the definition of the Great Lakes?

Great Lakes, for the purpose of calculating service requirements for an 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 miles 326 and 327), the Chicago River as far as the east side of the Ashland Avenue Bridge (between miles 321 and 322), and the Saint Lawrence River as far east as the lower exit of Saint Lambert Lock. For purposes of requiring MMCs with rating endorsements, the connecting and tributary waters are not part of the Great Lakes.




We hope this made your life a little easier and if you have other questions the MM-SEAS team is always here to help!


We do prefer to answer questions live with screen sharing to make both of our lives easier.


We hold free live virtual office hours Monday and Wednesday from 5:00 - 5:30 pm PT inside of mmseas.com under License Guidance and then Daily Office Hours.


Pro MM-SEAS members get access to our daily live office hours Monday thru Friday from 5:00 - 5:30 pm PT. You also get access to unlimited live 1 on 1 calls with one of our USCG Licensing Specialists. Pro MM-SEAS members can access these features inside of mmseas.com under License Guidance.

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