What is a crucial setting to adjust on your Nitrox computer before every dive?

The percentage of oxygen in the mix is a crucial setting to adjust on your Nitrox computer before every dive because Nitrox blends can vary significantly in their oxygen content, usually ranging from 32% to 40% oxygen for recreational diving. This composition affects the maximum operating depth for the specific blend, as higher oxygen levels increase the risk of oxygen toxicity. By correctly setting the percentage of oxygen in the Nitrox computer, it allows for accurate calculations of the dive's allowable limits, monitoring of no-decompression limits, and safe ascent profiles. Adjusting this setting helps ensure that divers can safely enjoy their dives within the parameters of their specific gas mixture.