ISO 24805:2022
Recreational diving services — Requirements for rebreather diver training — Decompression diving to 45 m
This document specifies requirements for rebreather diver training programmes which provide the competencies required to perform dives with a rebreather to 40 m using a nitrox breathing mixture or to 45 m using a trimix breathing mixture, requiring mandatory decompression stops.
This document specifies evaluation criteria for these competencies.
This document specifies the requirements under which training is provided, in addition to the general requirements for recreational diving service provision in accordance with ISO 24803.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Competencies
5 Prerequisites for training
5.1 General
5.2 Minimum age
5.3 Diving experience
5.4 Health requirements
6 Introductory information
7 Theoretical knowledge
7.1 Rebreather basics
7.2 Function of rebreather components
7.3 Breathing performance using a rebreather
7.4 Rebreather assembly and checks
7.5 Gas supply duration
7.6 CO2 absorbent duration
7.7 Rebreather pre-water entry checks
7.8 Dive conduct
7.9 Decompression dives
7.9.1 General
7.9.2 Techniques
7.10 Identifying and reacting to potential issues
7.10.1 General issues
7.10.2 CO2-related issues
7.10.3 Actions to be taken where the diver is able to breathe from the breathing loop
7.10.4 Actions to be taken where the diver is not able to breathe from the breathing loop
7.11 Hypercapnia, hypoxia and hyperoxia
7.12 Buddy system
7.13 Rebreather maintenance
7.14 Maintaining knowledge and skills
8 Practical skills
8.1 General
8.2 Pre-dive procedures
8.3 Dive conduct
8.4 Emergency situations
8.5 Response to rebreather malfunctions
8.6 Post-dive procedures
9 Instructors
10 Training equipment and materials
10.1 Training equipment
10.2 Training materials
11 Practical training parameters
11.1 Training dives or in-water sessions
11.2 Instructor responsibilities
11.3 Rebreather dive leaders
11.4 Breathing gas limits
11.4.1 Closed-circuit rebreather
11.4.2 Semiclosed-circuit rebreather
12 Evaluation
12.1 Knowledge
12.2 Skill evaluation – Nitrox
12.3 Skill evaluation – Trimix
12.4 Proof of qualification
Annex A (informative) Gas density and gas mixtures
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Competencies
5 Prerequisites for training
5.1 General
5.2 Minimum age
5.3 Diving experience
5.4 Health requirements
6 Introductory information
7 Theoretical knowledge
7.1 Rebreather basics
7.2 Function of rebreather components
7.3 Breathing performance using a rebreather
7.4 Rebreather assembly and checks
7.5 Gas supply duration
7.6 CO2 absorbent duration
7.7 Rebreather pre-water entry checks
7.8 Dive conduct
7.9 Decompression dives
7.9.1 General
7.9.2 Techniques
7.10 Identifying and reacting to potential issues
7.10.1 General issues
7.10.2 CO2-related issues
7.10.3 Actions to be taken where the diver is able to breathe from the breathing loop
7.10.4 Actions to be taken where the diver is not able to breathe from the breathing loop
7.11 Hypercapnia, hypoxia and hyperoxia
7.12 Buddy system
7.13 Rebreather maintenance
7.14 Maintaining knowledge and skills
8 Practical skills
8.1 General
8.2 Pre-dive procedures
8.3 Dive conduct
8.4 Emergency situations
8.5 Response to rebreather malfunctions
8.6 Post-dive procedures
9 Instructors
10 Training equipment and materials
10.1 Training equipment
10.2 Training materials
11 Practical training parameters
11.1 Training dives or in-water sessions
11.2 Instructor responsibilities
11.3 Rebreather dive leaders
11.4 Breathing gas limits
11.4.1 Closed-circuit rebreather
11.4.2 Semiclosed-circuit rebreather
12 Evaluation
12.1 Knowledge
12.2 Skill evaluation – Nitrox
12.3 Skill evaluation – Trimix
12.4 Proof of qualification
Annex A (informative) Gas density and gas mixtures
Bibliography