Advanced Nitrox and Decompression

This course examines the use of EAN21 through one hundred (100) percent oxygen for optimal mixes to a depth of forty (40) msw / one hundred thirty (130) fsw. The objective of this course is to train divers in the benefits, hazards and proper procedures for utilizing EAN-21 through one hundred (100) percent oxygen for dives not requiring staged decompression. Decompression techniques may be combined with this course at the discretion of the instructor.

Student Pre-Requisites:

  • Be a minimum age of fifteen (15).
  • Have a minimum certification of TDI Nitrox Diver (or equivalent).
  • Show proof of twenty-five (25) logged open water dives.
  • If this course is taught in conjunction with the TDI Decompression Procedures Course, then the minimum age is eighteen (18).
  • Open Water Execution:
  • Four (4) dives are required with a minimum accumulated bottom time of one hundred (100) minutes.
  • If Advanced Nitrox is taught in conjunction with Decompression Procedures only a total of six (6) dives are required with a maximum depth of forty five (45) meters / one hundred fifty (150) feet.
  • Only two (2) dives from Advanced Wreck course may be credited towards the total dives required.

Course Structure:

TDI allows instructors to structure courses according to the number of students participating and their skill level.

Duration: The minimum number of classroom and briefing hours is six (6).

Required material:

  • TDI Advanced Nitrox Student Manual or E-learning course material

Optional Material:

  • TDI EAD/P02 Tables.
  • TDI Advanced Nitrox Power Point Presentation.

Required Skill Performance to meet certification requirements:

  • Satisfactorily complete the TDI Advanced Nitrox Course written examination.
  • Complete all open water requirements safely and efficiently.
  • Demonstrate mature, sound judgment concerning dive planning and execution.

Maximum training depths shall not exceed forty (40) msw / one hundred thirty (130) fsw. The following open water skills must be completed by the student during all open water dives:

  • Land Drills
  • Review of Nitrox Skills
  • Demonstrate correct use of oxygen analyzer including optimal procedure for calibrationm
  • Demonstrate adequate pre-dive planning
  • Limits based on personal gas consumption.
  • Limits based on oxygen exposures at planned depth with actual mix.
  • Limits based on nitrogen absorption at planned depth with actual mix.
  • Calculate and Log CNS loading for each dive including cumulative exposure where appropriate
  • Demonstrate understanding of gas labeling.
  • Demonstrate adherence to conventions regarding prep of equipment for Oxygen service.
  • Program nitrox computer with appropriate oxygen percentage if used.
  • Properly execute the planned dive within all pre-determined limits.

Pre-Dive Drills

Use START* before every dive START is:

  • S-Drill (OOA drill and Bubble Check)
  • Team (buddy equipment checks)
  • Air (gas matching)
  • Route (entry/exit and planned path underwater)
  • Tables (depth, duration, waypoints and schedule)
  • Stress analysis and mitigation

In-water Drills:

  • Demonstrate buoyancy control (ability to hover at fixed position in water column without moving hands or feet)
  • Show good awareness of buddy and other team members through communications, proximity and team oriented dive practices
  • Demonstrate ability to manage free flow from primary regulator in controlled fashion (shutdown cycle), and switch to back-up regulator.
  • Conduct appropriate safety stop while maintaining neutral buoyancy
  • Demonstrate ability to share “air” with buddy as both recipient and donor in a controlled manner while maintaining position in water column.
  • Demonstrate correct body position (appropriate trim, such as horizontal / streamlined when moving forward)
  • Demonstrate proper stress analysis with self and team mates

Enjoy our site? Please spread the word :)