Outer Continental Shelf National Center of Expertise (OCSNCOE)



The Outer Continental Shelf Lands Act (OCSLA) and subsequent amendments, outlines the Federal responsibility over the submerged lands of the OCS. Responsibilites for regulating OCS activities are split between the Department of the Intererior, Department under which the U.S. Coast Guard is operating (currently the Department of Homeland Security) and the Department of the Army.

Additional information and history can be found on the Bureau of Ocean Energy Management (BOEM) on the Federal Offshore Lands and Outer Continental Shelf Lands Act History webpages.


U.S. Coast Guard Regulations applicable to OCS activities are published as 33 CFR Subchapter N - Outer Continental Shelf Activities (Parts 140 through 147). CFRs can also be viewed at ecfr.gov (regularly updated online version) or govinfo.gov (annual editions).

Additional information and history can be obtained by viewing the Federal Register (FR) notices related to, and referenced from, the CFRs. We have consolidated all FRs referenced in 33 CFR Subchapter N into a single pdf document:

33 CFR Subchapter N FRs

The FRs are arranged in chronological order, beginning with the initial publication of 33 CFR Subchapter N on February 9, 1956. The document contains a hyperlinked Table of Contents, 'bookmarks' to aid in navigating through the document and 'how to' guidance on using the FRs. Final Rule FRs make up the bulk of this document, but Advanced Notice of Proposed Rulemaking (ANPRM) and Notice of Proposed Rulemaking (NPRM) FRs have also been included where additional historical context may be useful.

Policy and Guidance related to OCS Activities

The overarching policy for OCS Activities can be found in the Marine Safety Manual (MSM), Volume II: Section G - OCS ActivitiesSection G consists of the following chapters:

  ○  Chapter 1, Regulations, Policy and Guidance for a Unit Conducting an OCS Activity,
  ○  Chapter 2, Procedures Applicable to U.S. MODUs,
  ○  Chapter 3, Procedures Applicable to Foreign MODUs,
  ○  Chapter 4, Procedures Applicable to Floating OCS Facilities,
  ○  Chapter 5, Procedures Applicable to Fixed OCS Facilities or Platforms, and
  ○  Chapter 6, Procedures Applicable to Other Vessels Engaged in OCS Activities.

Job Aids, which replaced the legacy CG-840 Books, are posted on the Job Aid page (new or revised Job Aids will be posted as they are published).

Regulations, policy and guidance documents and/or links are available on the respective type of unit or vessel pages as follows:
  ●  Mobile Offshore Drilling Units (MODUs)
  ●  Floating OCS Facilities (FOFs), also commonly referred to as Floating Offshore Installations (FOIs)
  ●  Fixed OCS Facilities (Fixed Platforms)
  ●  Support Vessels: Offshore Supply Vessels & Liftboats (OSVs, Subchapters L & I) and Crew Boats (Subchapter T Small Passenger Vessels servicing the offshore Oil & Mineral industry)

Casualty Reporting

Current revisions of the "Report of Marine Casualty, Commercial Diving Casualty, or OCS-Related Casualty", CG-2692, supplemental forms and guidance can be found on the Office of Investigations & Casualty Analysis (CG-INV) 2692 Casualty Reporting Forms page.