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CMAS Semi-Closed Rebreather Instructor Course

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Course Overview

This course is designed to provide a good understanding of the techniques involved in teaching the use of semi-closed circuit Rebreathers for divers wishing to utilize the Dolphin or Ray unit. The objective of this course is to make the instructor aware of the additional physiological and technical problems encountered when using a semi-closed system aswell as to provide the diver with a good understanding of the special dive planning procedures appropriate to diving with semi-closed system.


Minumum age of 19.
CMAS 2 Star Instructor certified.
Nitrox Instructor certified.
Semi-Closed Rebreather certified.
Proof of 25 logged semi-closed rebreather dives.
Proof of assistance of a semi-closed rebreather diver course.

Details of the course

The Semi-Closed Rebreather instructor course covers:

  • History and evolution of rebreathers
  • Comparison of Open Circuit, Semi-Closed Circuit and Closed Circuit
  • Practical mechanics of the system
  • Review of Nitrox
  • Physiology
  • Formula work, metabolic consumption
  • Dive tables & dive computers
  • Problem solving
  • Dive planning

Course duration and number of dives

The Semi Closed Rebreather instructor course is a 3 day course and 4 dives are required.

Course Price

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Additional costs

Recreational Rental equipment if needed. set p/day
Dive sorbe required forthe course.

Equipment requirement

The Semi-Closed Rebreather instructor course has no specific equipment requirement more than your standard recreational dive gear. We supply the unit, nitrox tanks and mixes, and the oxygen analyser.

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