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NAUI Training Course

Mixed Gas CCR Diver

OVERVIEW

This course is to provide the diver with the skills and knowledge needed to minimise the risks of utilising helium-based or trimix breathing diluent gas mixes for dives to a maximum depth of 76 metres requiring decompression with rebreathers and constant PO2.

QUALIFICATIONS OF STUDENTS

Upon successful completion of the course, students are considered competent to plan and execute technical constant PO2 dives that require decompression and utilise helium-based or trimix breathing gas mixtures for decompression without direct supervision to depths not to exceed 76 metres provided the diving activities and the areas dived approximate those of training.

PREREQUISITES FOR ENTERING THE COURSE

Minimum age of 18.
Minimum certification as a NAUI Decompression Techniques, Heliair and CCR or equivalent.
Minimum of 100 logged hours on a closed circuit rebreather, 60 hours of which are directly on the specific CCR for mix gas training, a full and thorough demonstration of pre and post dive procedures must be performed by each prospective student.

SKILL REQUIREMENTS

Control manual operation holding constant PO2 for 15 minutes while instructor monitors PO2 gauge. The students are to analyse their own breathing gas mixture and to plan and safely execute each dive. Dive planning shall include limits based on gas consumption of bailout stages, oxygen exposures and inert gas loading for each stage of the dive and breathing gas mixture. Each diver is to demonstrate all skills listed in the NAUI CCR skills check off list, first in confined water, and following adequate practice, at a depth between 10 and 20 metres. Each student shall demonstrate underwater navigation appropriate to the dive plan. Students shall participate in a diver rescue simulation to include management of a diver experiencing oxygen toxicity. On at least two of the required dives ascent with ascent reel and DSMB and perform stage decompression.

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