What is the purpose of a Nitrox fill tag?

The purpose of a Nitrox fill tag is to specify the Nitrox mixture and Maximum Operating Depth (MOD). This information is crucial for divers who use Nitrox as it provides key details about the gas blend being used for the dive.

Understanding the Nitrox mixture is essential because different mixtures of oxygen and nitrogen affect dive planning, including no-decompression limits and potential risks of oxygen toxicity at greater depths. The MOD indicates the maximum depth at which that specific Nitrox mixture can be safely breathed without risking oxygen toxicity. By clearly displaying this information, divers can make informed decisions about their dive plans and ensure their safety underwater.

While other options touch on various aspects of diving, they do not directly relate to the specific health and safety parameters involved with the use of Nitrox in diving. Therefore, the focus on the mixture and MOD on a Nitrox fill tag is vital to promoting safe diving practices.