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Advanced Nitrox Diving Certficate


Further training of the student holding a Nitrox certificate to Nitrox Technical Diver Standards. This includes a greater understanding of custom blend mixes, planning of OTU/CNS values to allow for maximum dive safety to 50 metres and using an EAN80 or greater mixture for decompression purposes.


To attend the Advanced Nitrox Diver Course

  • Must be at least 18 years old.
  • Must submit a medical certificate clearing the holder as fit to participate in the sport of underwater diving before participating in any practical training. A medical practitioner using the CMAS-ISA Technical Diving Medical Examination Form must have carried out the medical examination. Where and individual is attending a CMAS-ISA course for the first time, the certificate must not be older than 3 months, and not older than 12 months when the Advanced Nitrox Diver certificate is finally issued.
  • Must hold a CMAS-ISA 2 Star Advanced Diver Certificate, a CMAS-ISA Nitrox Diver certificate or recognized equivalent and a CMAS-ISA Rescue Diver certificate or recognised equivalent.
  • Must have executed a minimum of 50 dives, at least 5 of these using a Nitrox mixture.
  • To write the Advanced Nitrox Diver theory examination
  • Must attend an Advanced Nitrox Diver Course overseen by a CMAS-ISA speciality approved in-date Advanced Nitrox Instructor. (Course Convenor)
  • To apply for the Advanced Nitrox Diver Certificate
  • Must pass the theory examination set by the Course Convenor and approved by the CMAS-ISA Technical Diving Committee.
  • Must attend the practical session including at least 3 dives using Nitrox, one of which should include decompression using pure Oxygen.


Part 6 and 7 must be done on the same course and on failing part 6, the candidate may have one rewrite within 3 months, failing which, the course must be re-done. The above-mentioned prerequisites are the minimum required for the CMAS-ISA Advanced Nitrox Diver certificate.