This course examines the use of EAN 21 through 100 percent (oxygen) for optimal mixes to a depth of 45 msw. The objective of this course is to train divers in the benefits, hazards and proper procedures for utilising EAN 21 through 100 percent oxygen for dives not requiring staged decompression. Decompression techniques may be combined with this course at the discretion of the instructor.

Qualifications of Graduates

Upon successful completion of this course, graduates may engage in diving activities utilising EAN 21 through 100% (oxygen) without direct supervision so long as:

• The diving activities approximate those of training.
  
• The areas of activities approximate those of training.
  
• Environmental conditions approximate those of training.
  

Upon successful completion of this course, graduates are qualified to enrol in:

• TDI Decompression Procedures Course.
  
• TDI Extended Range Course.
  
  

Student Pre-Requisites

The student must:

1. Be a minimum age of fifteen (15).
   
2. Have a minimum certification of TDI Nitrox Diver (or equivalent).
   
3. Show poof of twenty-five (25) logged open water dives, or the equivalent at the discretion of the instructor, in the environment in which the course is being presented.
   
4. If this course is taught in conjunction with the TDI Decompression Procedures Course, then the minimum age is eighteen (18).
   

Required Subject Areas

1. Physics
   
   • Pressure review.
     
2. Physiology
   
   • Hypoxia.
     
   • Oxygen Toxicity
     
     • Whole body (OTU’s).
       
     • Central Nervous System (CNS).
       
   • Nitrogen Narcosis.
     
   • Nitrogen Absorption and Elimination.
     
   • Carbon Dioxide Toxicity.
     
   • Carbon Monoxide Toxicity.
     
3. Formula Work
   
   • Best mix computations.
     
   • Maximum Operating Depth of mixture computations.
     
4. Equipment Considerations
   
   • Up to forty (40) percent oxygen content.
     
   • Above forty (40) percent oxygen content.
     
5. Dive Tables
   
   • Equivalent air depth with any table.
     
   • Computer generated tables.
     
6. Dive Computers
   
   • Mix adjustable.
     
   • 02 integrated.
     
7. Dive Planning
   
   • Operation Planning
     
     • Gas requirements.
       
     • Oxygen limitations.
       
     • Nitrogen limitations.
       
8. Common Mixing Procedures (demonstrate one method)
   
   • Partial pressure blending.
     
   • Continuous blending.
     
   • Membrane separation system.
     
9. Decompression
   
   • EAN usage as a decompression gas i.e. 50/50, 80/20 etc.
     
   • Oxygen for decompression.
     
   • Advantages / disadvantages of multiple gas switches.
     

Required Skill Performance And Graduation Requirements

Maximum training depths shall not exceed 45 msw. The following open water skills must be completed by the student during all open water dives:

1. Properly analyze gas mixtures.
   
2. 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.
     
3. Properly execute the planned dive within all pre-determined limits.
   

In order to complete this course, students must:

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

Equipment you will need for the course;

• Depth gauge and automatic bottom timer or dive computer. – 2 devices required
  
• Regulator(s) – 2 bottom and 1 deco all in oxygen service and DIN.
  
• Submersible pressure gauges are required on bottom cylinder and each stage cylinder.
  
• Wing-style BCD bladder with at least 20 Kg lift for bolted twinset with harness and backplate
  
• Line cutting device
• Ascent Reel with Lift Bag /Surface Marker Buoy.
• Exposure Suit adequate for the open water environment.
• Underwater Slate.
• 2 meters black surgical tubing

We can provide on hire all the above if required. Please let us know in advance.

The Price includes gas but there is an additional fee for certification and manual. Also if more than one TDI course is booked for consecutive attendance and paid for in advance, a 10% discount will apply to the total course costs (excluding certification fee and materials).

Please also remember to bring your GP signed medical with you (form available on website).

Please also check out our terms and conditions, packages available, price list, and the medical statement from the booking pack or from our website, and feel free to ask any questions you may have.