33 CFR § 163.03 - Definitions.

---
identifier: "/us/cfr/t33/s163.03"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "33 CFR § 163.03 - Definitions."
title_number: 33
title_name: "Navigation and Navigable Waters"
section_number: "163.03"
section_name: "Definitions."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "P"
subchapter_name: "PORTS AND WATERWAYS SAFETY"
part_number: "163"
part_name: "TOWING OF BARGES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 152, 2071; 49 CFR l.46(n)."
cfr_part: "163"
---


# 163.03 Definitions.

The following definition applies to this part:

*Merchant mariner credential or MMC* means the credential issued by the Coast Guard under 46 CFR part 10. It combines the individual merchant mariner's document, license, and certificate of registry enumerated in 46 U.S.C. subtitle II part E as well as the STCW endorsement into a single credential that serves as the mariner's qualification document, certificate of identification, and certificate of service.

[USCG-2006-24371, 74 FR 11213, Mar. 16, 2009]