Master Great Lakes/Inland Any Gross Tons: National


The Master Great Lakes & Inland waters allows the holder to serve as Master or Mate on vessels of any tonnage on the Great lakes & Inland waters. The Master Inland AGT permits the holder to serve as Master on vessels of any tonnage on Inland waters (not including the Great Lakes). After 30 days of training and observation on towing vessels and the completion of a TOAR (Towing Officer’s Assessment Record), the mariner may serve as a Master Towing Inland (or Great Lakes, if appropriate).


NMC Checklist for Master Great Lakes & Inland
CFR Reference: 46 CFR 11.433 (Great Lakes)
CFR Reference: 46 CFR 11.435 (Inland)

RECENCY: 90 days in the past 3 years on vessels of appropriate tonnage


DECK EXAMINATION GUIDE: ESS 2-1. At this link, you will find two Deck Examination Guides.  If your qualifying service for the license began before March 24, 2014, you may opt to be examined under the procedures of the old Deck Examination Guide.  The old guide’s examinations are significantly less difficult in most cases than the new guide’s.

To Apply for the Credential

Application Procedure

Credential Assistance

If you need help determining your eligibility or completing your application, please email us at Credential Assistance.


Mariners preparing for these credential examinations can begin on almost any Monday.  Course of study lasts from 4 to 6 weeks and is a combination of lectures and tutorials.  The tuition is good for one year.

Schedule online now