What is a common indicator of the maximum depth for a specific Nitrox mix?

The maximum operating depth (MOD) is a critical factor in Nitrox diving that indicates the greatest depth at which a specific Nitrox mix can be safely used without risking oxygen toxicity. The MOD is determined based on the percentage of oxygen in the gas mix and is calculated using partial pressure principles. As divers descend, the pressure increases, which also increases the partial pressure of oxygen in the breathing gas. If this partial pressure exceeds safe limits (generally 1.4 ATA for recreational dives), there is a significant risk of experiencing toxic effects. Therefore, knowing the MOD helps divers to plan their dives effectively and stay within safe limits, ensuring both safety and efficiency when using different Nitrox blends.

Decompression stops, surface intervals, and bottom time are all important aspects of dive planning, but they relate to different concepts, such as preventing decompression sickness and managing nitrogen absorption rather than determining the safe depth for a specific Nitrox mix.