Scuba Diving International (SDI) Computer Nitrox Practice Exam

Why is it important for team members to use the same Nitrox mixture?

1. To ensure all members have the same tank size

2. To promote uniform equipment usage

3. To share a common Maximum Operating Depth (MOD)

4. To reduce the cost of the dive

The correct answer is: To share a common Maximum Operating Depth (MOD)

Utilizing the same Nitrox mixture among team members is crucial primarily because it allows all divers to share a common Maximum Operating Depth (MOD). Each Nitrox blend has its specific MOD, which is the deepest depth at which it can be safely used without exceeding the oxygen limits. When divers use the same mixture, they can plan their dive profiles around that MOD, minimizing the risk of decompression sickness due to varying oxygen exposure levels that could occur if different mixtures were used. This uniformity enhances safety and ensures that all members of the dive team can dive effectively and enjoyably without concerns about exceeding safe operational limits. The other choices, while potentially relevant to diving practices, do not address the specific safety concerns associated with differing Nitrox mixtures. The size of tanks or uniformity in equipment use, while important for overall logistics, do not directly impact the safety implications of varying MODs caused by different Nitrox blends. Similarly, cost reduction is not a primary reason for using the same Nitrox mixture; safety and adherence to dive table or computer limits take precedence in dive planning.