TDI Advanced Nitrox       This two day course, includes 4 nitrox dives (100 minutes bottom time) and covers all the topics in the nitrox course in much greater detail, with in-depth coverage of CNS & whole body oxygen toxicity and tracking, common mixing methods, best mix computations, decompression gas, accelerated decompression, dive planning, gas consumption calculations and equipment considerations, all culminating in certification to use 22% - 100% (oxygen) as a breathing gas. Pre-requisites:  Nitrox diver or equivalent, 25 logged dives, minimum 15 years of age.