TDI Nitrox course is an entry level course for divers wishing to utilize enriched air nitrox as a breathing gas. Little else has impacted recreational diving more than the introduction of nitrox, allowing more time underwater. During this course, you will learn the benefits, hazards and proper procedures for diving with EAN 22 to EAN 40 your TDI Instructor will also cover " Equipment considerations " Cylinder labeling " Analyzing of Nitrox The course follows an easy to read and understand diver manual titled Understanding Nitrox and water proof tables for quick on site reference.