33 CFR 155.110: Definitions that apply to this part

Last reviewed: October 14, 2026

This section says which definitions apply to this part. It adopts the definitions in part 151 of this chapter, except for the word "oil", and in part 154 of this chapter, unless a section states otherwise. It also defines merchant mariner credential or MMC.

Applies toThe definitions in this section apply to this part.

What it says

  1. Unless a section specifically states otherwise, the definitions in part 151 of this chapter, except for the word "oil", and in part 154 of this chapter apply to this part.

    “Except as specifically stated in a section, the definitions in part 151 of this chapter, except for the word “oil”, and in part 154 of this chapter, apply to this part.”

  2. Merchant mariner credential or MMC means the credential issued by the Coast Guard under 46 CFR part 10.

    “Merchant mariner credential or MMC means the credential issued by the Coast Guard under 46 CFR part 10.”

  3. The MMC 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.

    “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”

  4. The MMC serves as the mariner's qualification document, certificate of identification, and certificate of service.

    “into a single credential that serves as the mariner's qualification document, certificate of identification, and certificate of service.”

Common questions

Does the part 151 definition of oil apply to this part?

No. The definitions in part 151 of this chapter apply to this part, except for the word "oil".

“the definitions in part 151 of this chapter, except for the word “oil”, and in part 154 of this chapter, apply to this part.”

What does MMC mean in this part?

MMC means the merchant mariner credential issued by the Coast Guard under 46 CFR part 10.

“Merchant mariner credential or MMC means the credential issued by the Coast Guard under 46 CFR part 10.”

Do part 154 definitions apply to this part?

Yes, except as a section specifically states otherwise. The definitions in part 154 of this chapter apply to this part.

“Except as specifically stated in a section, the definitions in part 151 of this chapter, except for the word “oil”, and in part 154 of this chapter, apply to this part.”

The text of 33 CFR 155.110

Electronic Code of Federal Regulations (eCFR), current as of April 16, 2026 · Read it on eCFR

Definitions

Except as specifically stated in a section, the definitions in part 151 of this chapter, except for the word “oil”, and in part 154 of this chapter, apply to this part. The following definition also 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.

Sections it refers to

  • 46 CFR part 10
  • part 151 of this chapter
  • part 154 of this chapter

The plain-English explanation on this page was written with AI from the regulation text above and checked automatically before publishing: every quote appears in the text, every number comes from it, and a second model confirmed each statement adds nothing the text doesn't say. Regulation text current as of April 16, 2026. The regulation text governs. RegKnot is not affiliated with the U.S. Coast Guard.