SSI Decompression Diving Practice Test

The choice of nitrox and multi-gas dive computers reflects the variety of breathing gas mixtures that divers might use during their dives. Nitrox dive computers are designed to manage dives that utilize enriched air nitrox, which has a higher concentration of oxygen than normal air. This allows divers to extend their bottom times and reduce nitrogen absorption.

Multi-gas dive computers are even more versatile, as they can accommodate various gas mixtures, including those with different levels of oxygen and other inert gases. This is particularly beneficial for divers who use multiple gases during a single dive or who follow more complex dive profiles. Using these types of computers enhances safety by continuously calculating no-decompression limits and ascent rates specific to the gas mixture being used, thereby minimizing the risk of decompression sickness.

In contrast, the other types listed (single-gas and rebreather, analog and digital, standard and advanced) may refer to features or capabilities but do not capture the specific focus on multi-gas capability that is crucial for modern diving practices involving mixed gases. The distinction around nitrox and multi-gas usage is essential for understanding contemporary dive safety and planning.