Mariner Credentialing

3/8/2018: Merchant mariner credential and medical certificate harmonization

The National Maritime Center posted a notice to its website announcing that mariners will be allowed to request harmonized expiration dates of their Merchant Mariner Credential (MMC) and Medical Certificate, in accordance with Section 304 of the 2015 Coast Guard Authorization Act, Public Law No. 114-120.

CG-MMC Policy Letter 01-18 provides detailed guidelines for those mariners who wish to harmonize the expiration dates of their original or renewed MMC and Medical Certificate.

For further information, contact the NMC call center via e-mail to, via online chat, or via phone at 1-888-IASKNMC (427-5662).

This blog is not a replacement or substitute for the formal posting of regulations and updates or existing processes for receiving formal feedback of the same. Links provided on this blog will direct the reader to official source documents, such as the Federal Register, Homeport and the Code of Federal Regulations. These documents remain the official source for regulatory information published by the Coast Guard.

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