I. INTRODUCTION
This is the Instructor level certification course for Instructors wishing to teach the Drager Ray nitrox semi-closed circuit rebreather course who are already qualified to teach the Atlantis 1 / Dolphin.

II. COURSE OBJECTIVES
The objective of this course is to update Instructors to teach the Drager Ray rebreather, and to review basic rebreather diving skills appropriate to diving within the normal recreational depth limits for no-decompression diving.

Ill. QUALIFICATION OF GRADUATES
Upon successful completion of this course, graduates may add TDI Nitrox Semi-Closed Circuit Rebreather no-decompression course for the Ray rebreather, not to exceed the manufacturers designed depth maximum. This course is manufacturer specific.

IV. WHO MAY TEACH
This course may be taught by any active TDI Ray Rebreather Instructor Trainer

V. INSTRUCTOR - INSTRUCTOR RATIO
A. Classroom
Unlimited so long as adequate facility, supplies and additional time are provided to ensure comprehensive and complete training
B. Openwater
Six Instructor candidates per TDI Rebreather Instructor Trainer. A maximum of eight Instructors with a current Instructor present.

VI. INSTRUCTOR CANDIDATE PRE-REQUISITES
A. Minimum age 18
B. Minimum certification of TDI Rebreather Instructor (Atlantis 1/ Dolphin)

VII. REQUIRED COURSE MINIMUMS
A. Classroom / Brief Hours - 4
B. Water Sessions - 2

VIII. REQUIRED EQUIPMENT
The following equipment is required for each Instructor candidate
A. Semi-closed circuit rebreather
B. Buoyancy compensator with power inflator
C. Depth gauge and automatic bottom timer and / or dive computer
D. Mask, fins
E. Exposure suit suitable for the diving environment
F. Knife
G. Slate and pencil



IX. REQUIRED SUBJECT AREAS
The following topics must be covered during this course. Instructor Trainers must u the TDI Semi-Closed Circuit Rebreather Student, Instructor Guide, manufactures manual and the current TDI Standards & Procedures Instructor Manual, but may also use any additional text or materials that they feel help present these topics.
A. Mechanics of a rebreather
1. Scrubber canister
2. Scrubber materials
3. Scrubber endurance
4. Breathing bag
5. Mouthpiece and hoses
6. Exhaust valve
7. Inlet flow valve
B. Gas Consumption
1. Cylinder sizes
2. Flow rates- Ray differences to Atlantisi / Dolphin
3. Depth and workload
4. Oxygen Percentages (for cylinder and breathing bag)
5. Using flow rate calculation and F102 Chart
C. Problem Solving
1. Canister flooding
2. Mouthpiece loss
3. Scrubber exhaustion
4. Breathing bag rupture
5. Battery or censor loss
6. Open circuit bailout system
7. Post problem maintenance of equipment

X. REQUIRED OPEN WATER SKILLS
The following skills must be completed by the Instructor candidate (maximum
training depth shall not exceed the manufacturers design limit)
A. Demonstrate properly analysis of all gas mixtures to be used
B. Demonstrate a complete systems check and rebreather configuration
C. Demonstrate adequate pre-dive planning
1. Limits based on personal gas consumption
2. Limits based on oxygen exposures at planned depth with actual mix
3. Limits based on nitrogen absorption at planned depth with actual mix
D. Properly execute the planned dive within all pre-determined limits
E. Demonstrate the proper procedures for
1. Buoyancy control
2. Bail-out
3. Mouthpiece removal
4. Ascent techniques

X. REQUIRED OPEN WATER SKILLS (con’t)
5. Safety stops
6. Buddy checks
7. Simulated emergency
F. Properly execute the break down and maintenance of rebreather

XI. GRADUATION REQUIREMENTS
In order to complete this course, the Instructor candidate must:
A. Demonstrate mature, sound judgement concerning training, dive planning and execution
B. Complete all requirements safely and efficiently
C. Demonstrate proficiency in teaching the TDI Semi-Closed Circuit Re-breather Diver Program

XII. SUPPORT MATERIALS
A. Instructor Registration
B. Semi-closed Circuit Rebreather Instructor Guide
C. Semi-closed Circut Rebreather Diver Manual
D. TDI Standards & Procedures Instructor Manual