When using Nitrox, what is an essential first step before a dive?

Analyzing the tank contents is critical before a dive with Nitrox because it ensures that the diver is aware of the exact mix of gases they will be breathing underwater. Nitrox typically has a higher concentration of oxygen than regular air, and improper gas mixtures can lead to oxygen toxicity or other diving-related risks. By analyzing the tank, divers confirm the oxygen percentage and the corresponding maximum operating depth for that specific mixture, allowing for safe dive planning and execution. This step is fundamental in preventing potential dangers associated with incorrect gas mixes, establishing a safe diving environment, and ensuring adherence to the guidelines for the specific Nitrox blend being used.