TDI Nitrox Diver Course is an entry level course for divers wishing to continue their diver education and utilize enriched air nitrox as a breathing gas to extend no decompression limits at depth. You can expect to learn the benefits, hazards, and proper procedures for using nitrox mixes from 22 through 40 percent oxygen content. This course is advanced over SDI nitrox in that we will go over tables and how they relate to computers.