This instruction provides current policy, information and guidance to Occupational Safety and Health Administration (OSHA) national, regional, and area offices; industry parties; OSHA State programs and federal agencies concerning OSHA's authority over persons working on vessels (inspected vessels, uninspected vessels, and commercial uninspected fishing industry vessels) and facilities on or adjacent to U.S. navigable waters and the Outer Continental Shelf (OCS). This instruction provides information and guidance that: Supports DOL's Strategic Plan Performance Goal for increased emphasis on improving occupational safety and health in high-hazard workplace activities and maximizing the use of inspection resources. Provides OSHA compliance officers and consultants, and other interested government and industry parties, with specific guidance and information in support of inspections and compliance activities for vessels and facilities on or adjacent to U.S. navigable waters and the OCS. This instruction has been revised and updated to include significant changes as follows: Updates the guidance to reflect the decision of the United States Supreme Court in Chao v. Mallard Bay Drilling, Inc., 534 U.S. 235 (2002). Provides policy guidance for the enforcement of the OSH Act with respect to towing vessels that on August 9, 2004, were added by legislation to the 46 U.S.C. 3301 list of vessels that require inspection by the U.S. Coast Guard. Provides updated guidance regarding enforcement on permanently moored craft (previously known as permanently moored vessels), such as craft used for gaming or entertainment purposes which do not have a practical capacity to get underway. Incorporates guidance from the instruction concerning the roles of OSHA and the U.S. Coast Guard on the OCS, CPL 02-00-046 (CPL 2.46), Memorandum of Understanding Between the Occupational Safety and Health Administration and the U.S. Coast Guard (Concerning Occupational Safety and Health on Artificial Islands, Installations and Other Devices on the Outer Continental Shelf of the United States), January 20, 1982. Addresses the applicability of OSHA's General Industry Standards (29 CFR Part 1910) to maritime hazards, as well as the coverage of OSHA's Shipyard Employment Standards (29 CFR Part 1915), Marine Terminals Standards (29 CFR Part 1917), and Longshoring Standards (29 CFR Part 1918), and address marine operations in the Construction Industry (29 CFR Part 1926). Provides an appendix with questions and answers to commonly asked questions. Delivers available safety and health information in a web-based format with electronic links to noted references.