# 46 CFR § 10.203: Requirement to hold a TWIC and a Merchant Mariner Credential

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-46-10.203

## Section

- **Citation:** 46 CFR § 10.203
- **Heading:** Requirement to hold a TWIC and a Merchant Mariner Credential
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 46—Shipping > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER B—MERCHANT MARINE OFFICERS AND SEAMEN > PART 10—MERCHANT MARINER CREDENTIAL > Subpart B—General Requirements for All Merchant Mariner Credentials

## Text

(a) Failure to obtain or hold a valid TWIC serves as a basis for the denial of an application for an original, renewal, new endorsement, duplicate, or raise of grade of a mariner's credential and may serve as a basis for suspension and revocation under 46 U.S.C. 7702 and 7703.
(b) An MMC must be retained by the mariner to whom it was issued and, while valid, must be produced to verify qualifications when requested by an authorized official as identified in 33 CFR 101.515(d). Posting of the officer endorsement may be necessary as required in 46 U.S.C. 7110.
(c) Although an MMC serves as certificates of identification, a TWIC must be retained by the mariner to whom it was issued and, while valid, serves as the mariner's primary identification document. The TWIC must be produced to verify identity when required by an authorized official as identified in 33 CFR 101.515(d).
[USCG-2006-24371, 74 FR 11216, Mar. 16, 2009, as amended by USCG-2018-0874, 84 FR 30881, June 28, 2019; USCG-2021-0834, 89 FR 102332, Dec. 17, 2024]

## Nearby sections

- [46 CFR § 10.101 § 10.101 Purpose.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.101.md)
- [46 CFR § 10.103 § 10.103 Incorporation by reference.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.103.md)
- [46 CFR § 10.107 § 10.107 Definitions in subchapter B.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.107.md)
- [46 CFR § 10.109 § 10.109 Classification of endorsements.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.109.md)
- [46 CFR § 10.201 § 10.201 General characteristics of the Merchant Mariner Credential.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.201.md)
- [46 CFR § 10.203 § 10.203 Requirement to hold a TWIC and a Merchant Mariner Credential.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.203.md)
- [46 CFR § 10.205 § 10.205 Validity of a Merchant Mariner Credential.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.205.md)
- [46 CFR § 10.207 § 10.207 Identification number.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.207.md)
- [46 CFR § 10.209 § 10.209 General application procedures.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.209.md)
- [46 CFR § 10.211 § 10.211 Criminal record review.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.211.md)
- [46 CFR § 10.213 § 10.213 National Driver Register.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.213.md)
- [46 CFR § 10.214 § 10.214 Security Check.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.214.md)
- [46 CFR § 10.217 § 10.217 Merchant Mariner Credential application and examination locations.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.217.md)
- [46 CFR § 10.219 § 10.219 Fees.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.219.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-46-10.203. Check the current official text before relying on it. Not legal advice.