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TDI Technical Diving Courses

TDI Technical Diving Courses

TDI Advanced Nitrox Diver

This is a four dive course which qualifies you to use rich nitrox mixes between 40% and 100% oxygen during non-decompression dives. This is a 'gentle' intro to technical diving and is a great starting point if you want to explore whether you are interested in taking further tec courses. In additional it is a fundamental course required for advancing to further courses such as trimix diving.

The objective of this course is to train divers in the benefits, hazards and proper procedures for utilizing 21% to 100% oxygen for dives not requiring staged decompression up to a maximum depth of 40 meters.

TDI Decompression Procedures or the Intro to Tech may be combined with this course at the discretion of the instructor. Find out more.

What will we do on the course?

Theory comprises further discussions and explanations of the risks and benefits of oxygen, with particular emphasis on uses of oxygen outside the normal limit of EAN40 covered in recreational courses. It will also introduce the concepts of using more than one mix of nitrox in recreational diving and starting to develop risk management techniques to introduce greater safety through problem anticipation, management and execution.

During dives on the course you will learn how to dive with dual and multiple gas sources using both twinsets and stage cylinders. This will include adaption of basic diving skills (such as mask and reg clearing, air sharing and buoyancy skills) when using new equipment configurations (wings, twinsets and singles with pony bottles or stages).

Practical applications to be mastered include

  • Pre-dive analysis of gasses
  • Gas use planning
  • Depth management issues related to changing to higher O2 mixes during dives
  • Basic problem solution both for subsequent recreational diving and in preparation for future tec courses.

Why do the course?

  • As an introductory tec course - check out what it's about
  • Extend recreational diving range.
    For example a multi-level dive that starts deep with limited bottom time may often have an area much shallower that you also want to see. Often the start depth uses gas and no-deco time that limits time in the shallows. Having two gasses - one for shallow another for deep - takes away these limitations.
  • Introduce greater conservatism - use higher 02 mixes at the end of the dive to eliminate N2 "outside plan" - which is great for multi-day repetitive dives.
  • Challenge yourself - advance your diving knowledge and skills.
  • Dive Pros
    • Gain more detailed knowledge to help teach recreational Nitrox
    • Preparation for "self-reliance" skills required as a professional diver
    • Challenge and advancement of diving skills


  • Nitrox Diver
  • Minimum of 25 logged dives
  • Minimum age: 15 years

Course Content

  • 4 Open Water dives with minimum 100 minutes bottom time
  • Academics - 6 hours minimum of classroom and briefings
  • Knowledge review and exam
  • 2 days minimum

Required Materials and Equipment

  • TDI Advanced Nitrox Student Manual
  • Optional: TDI EAD I PO2 Tables

This course can be taken in combination with TDI Decompression Procedures. Find out more.


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