When using a dive computer, what must you ensure when diving with Nitrox?

When diving with Nitrox, it is essential to set the dive computer to the correct oxygen percentage. This is crucial because the specific mixture of oxygen and nitrogen in the gas you will be breathing affects your dive's no-decompression limits, ascent rates, and overall safety. Each Nitrox blend has a different oxygen content, which influences the partial pressures of oxygen that the dive computer will calculate during your dive. If the computer is not set to the correct percentage of oxygen, it could lead to an increased risk of oxygen toxicity or insufficient dive planning, which may compromise your safety.

In contrasts, ensuring the computer is set to the correct pressure, calibrated for cold water, or fully charged does not specifically pertain to the unique considerations of diving with Nitrox. While those aspects are important for safe diving in general, they do not directly relate to the specific need to manage the oxygen content in your breathing gas when using Nitrox.