TS EN ISO 24804/A11

TS EN ISO 24804/A11 is an amendment document that supports the framework for recreational diving services training related to rebreather diver instruction. Its subject is the competencies, training conditions and assessment criteria needed for a diver to conduct no-decompression dives using a rebreather within a limited depth range. Because a rebreather recycles part of the breathing gas, it involves different operating habits and training emphasis than conventional open-circuit scuba.

The technical meaning of no-decompression diving and nitrox use

In this standard family, “no-decompression diving” means dives planned so that mandatory decompression stops are not required. The stated depth limit is 30 m, and nitrox is identified as the breathing gas. In general technical terms, nitrox is a breathing gas with an oxygen fraction higher than air, often used in diving to manage inert gas loading in certain profiles. In rebreather training, core topics typically include gas management, breathing-loop monitoring, awareness of carbon dioxide buildup, and correct pre-dive checks of the system.

Where this amendment sits in the document set

Annex A11 updates the aligned European version of the parent subject matter and should not be read as a standalone training standard. The document defines the competencies a training programme is meant to deliver, the criteria used to evaluate those competencies, and the requirement that training be provided alongside the general rules for recreational diving services. It is therefore especially relevant to training organisations and service providers that need to understand the scope, boundaries and assessment logic of rebreather diver education.