NFPA 306 outlines the locations of flammable and combustible objects on maritime vessels as well as safety measures for working in restricted spaces and entering them. For shipyards, waterfront facilities, and marine vessels, gas dangers pose serious fire safety and life safety risks. The Standard for the Control of Gas Hazards on Vessels (NFPA 306) establishes a set of guidelines to reduce the risks associated with concentrations of poisonous, flammable, and combustible liquids, gases, chemicals, or vapors. The standard specifies the minimal standards needed to enter and operate in limited places on waterfront infrastructure and marine vessels. It covers land-side enclosed spaces (whether stationary or mobile) inside the limits of the shipyard or other waterfront facility, as well as vessels that are being built, altered, repaired, or broken.