TDI Advanced Nitrox & Decompression Procedures

Want to dive on sites where no-deompression limits are too conservative?

Advanced Nitrox

The TDI Advanced Nitrox Course qualifies divers to use enriched air nitrox from EAN 21 through EAN 100 percent within your current certification level to a maximum depth of 40 metres/130 feet during dives that do not require staged decompression. Often taught in conjunction with the TDI Decompression Procedures course, this can be considered the foundation of your technical diving career. TDI Advanced Nitrox is also a must for SCR or CCR divers.

Decompression Procedures

The TDI Decompression Procedures Course prepares you for planned staged decompression diving. With a maximum operating depth of 45 metres/150 feet, this course is your first step beyond the normal sport diving limits. The TDI Decompression Procedures Course combined with the TDI Advanced Nitrox course form the foundation of all other technical courses. After these two courses and some additional experience, the stage has been set for you to move onto additional technical levels.

Course Fees

Advanced Nitrox and Decompression Procedures

  • $695 per person, plus materials ($72) and the $25 TDI certification processing fee.

Required Equipment

Redundant Gas system (back-mounted doubles, Sidemount, or high-capacity single with H-valve). Pony bottle with stage mounting hardware (40 cuft recommended) for high PO2 decompression gas. Regulators for each tank (DIN preferred). Dive computer with ability to handle PO2 mixtures up to 100% and manage at least two gas mixtures with in-water switching and planned decompression stops. Either a second similar computer or a Bottom-Timer (almost any tech/rec computer set in GAUGE mode will suffice for this). SMB with overpressure release valve. Reel with at least 150ft of line. At least two cutting tools, two lights, slate, backup mask. Appropriate exposure suit for extended cold water dives.

Equipment requirements tend to present a unique challenge. And we are available to discuss options to manage the requirements with prospective students.


  • Nitrox and Advanced Open Water certification. At least 25 logged dives and DAN insurance.
  • Be 18 years old.