Scuba Diving International (SDI) Computer Nitrox Practice Exam 2025 - Free Nitrox Certification Practice Questions and Study Guide

When planning a dive with a Nitrox mix, it is essential to consider your total dive time and depth limits because these factors directly influence your exposure to oxygen and nitrogen under pressure. Each Nitrox blend contains a higher percentage of oxygen than regular air, which changes the limits of your dive due to the increased risk of oxygen toxicity at greater depths.

Understanding the maximum operating depth (MOD) for your specific Nitrox mix is crucial. Exceeding this depth can lead to dangerous levels of oxygen in your bloodstream. Moreover, your total dive time must be managed to avoid exceeding the no-decompression limits, which are specific to the gas mixture you are using. Longer dive times can increase nitrogen absorption, and since Nitrox is designed to reduce nitrogen exposure, maintaining awareness of your total planning is vital to ensure safety and compliance with dive safety practices.

While factors like the color of the tank, current weather conditions, and the experience level of your dive buddy are important for planning a dive, they are secondary when it comes to the specifics of managing your chosen Nitrox mix and ensuring safe diving practices relative to gas management.