Which document contains regulations for hearing conservation afloat?

The document that contains regulations for hearing conservation afloat is the OPNAVINST 5100.19 series, Chapter B4. This instruction specifically provides guidance and requirements related to the Navy's policies for occupational safety and health, including hearing conservation measures for personnel working in maritime environments. It outlines necessary practices, procedures, and responsibilities to protect sailors from hearing loss caused by exposure to hazardous noise levels while onboard ships.

Understanding the relevance of this instruction is crucial for ensuring that hearing conservation strategies are effectively implemented and adhered to in maritime operations, where noise exposure can be significant. This guidance is part of a broader set of Navy safety instructions that contribute to the overall health and safety of personnel.

In contrast, the other documents mentioned address different aspects of occupational safety. DoDI 6055.12 pertains to the Department of Defense's overall occupational and environmental health program, while OPNAVINST 5100.23 series, Chapter 18 focuses on different safety management systems, rather than specifically addressing hearing conservation in the context of afloat operations. MCO 6260.1 series is related to hearing conservation in the Marine Corps but does not pertain to afloat regulations in the Navy context. Thus, the selection of the OPNAVINST 5100.