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A Divemaster (DM) is a diving qualification used throughout most of the world in recreational scuba diving for a diver who has overall responsibility for a group of divers. As well as being a generic term, Divemaster also refers to the lowest professional rating of many training agencies, such as PADI, SSI, SDI, NASE, except NAUI, which rates a NAUI Divemaster just under an Instructor but above an Assistant Instructor.
The certification is a pre-requisite for becoming an instructor in recreational diving with most agencies except NAUI, where it is an optional step to Instructor, because of the different position of the NAUI Divemaster in the NAUI hierarchy.
The role of a Divemaster can be varied, but will predominantly encompass the following roles:
- Organizing, conducting and supervising recreational diving activities (but not training), both shore and boat based.
- Assisting instructors in conducting training programs and activities for certified divers.
- Generally supervising non-training related diving activities by planning, organizing and directing dives.
- assessing the hazards of a dive site and informing the divers of the hazards,
- briefing divers on the layout and points of interest of a dive site,
- suggesting routes for a dive at a specific site for autonomous divers,
- checking divers into and out of the water from a boat or shore entry point,
- leading a group of divers in the water as a tour guide.
- Within the limits of some agencies, Divemasters may:
- act as instructional assistants to instructors.
- supervise participants in experience programs for uncertified divers.
- teach and certifying skin divers and snorkellers.
- conduct scuba review programs for certified divers.
Responsibility and legal position
The legal duty of care of a divemaster to a client varies according to the legislation of the country, where it is often poorly defined. The use of waivers and/or assumption of risk forms that are intended to minimize legal accountability of divemasters is a common practice, but the validity of such waivers will vary with the legislation.
Equivalence in other modes of diving
In technical diving, divers are assumed to be competent and responsible for their own safety or the safety of the team of which they are members to the extent that is agreed by that team. However it is not unusual for a technical team or expedition group to appoint one of their number as a team leader or surface dive marshall, but the surface marshall is often more of an administrative position, who will check divers into and out of the water, and the dive team leader is more the navigator, or the person in front of the group than someone making safety decisions for other divers.
NAUI has a Technical Support Leader course that is designed to train NAUI Divemasters and Assistant Instructors who are also technical divers in this role.
Professional divers generally work in teams which have one or more divers in the water and a supervisor on the surface, with one or more assistants for handling lifelines, umbilicals, communications, gas panels and other support equipment, and a standby diver who is responsible for assisting or rescuing the in-water divers in an emergency. In these circumstances the supervisor has a high level of responsibility for the safety of the dive team and anyone else on site.
Employment opportunities and conditions
Divemasters, in theory, have the ability to work in holiday destinations in many parts of the world. They may work in diving resorts, private yachts, cruise ships and dive centres – anywhere where there is a demand for diving, however, it is rare for Divemasters to be paid for their efforts, usually they work for tips, the experience, and/or discounts on equipment purchases.
Many Divemasters also work in retail dive facilities and assist the instructor with training and supervision.
During Divemaster training, candidates learn dive leadership skills through classroom, independent study and practical training exercises. Some Divemaster programs require an internship program too. They complete water skills and stamina exercises, training exercises that stretch their ability to organize and solve problems and help others to improve their abilities.[clarification needed]
Candidates put this knowledge into action through a structured internship or a series of practical training exercises. Some programs will include the candidate assisting in actual diving programs with real diving students. Other programs can be run as role playing and involve other Divemaster candidates, rather than real students.
Divemasters can develop to Divemaster level through two different methods. Either through progressing along the recreational levels of diving, or through Divemaster internships that fast-track the candidate to Divemaster level by having them become involved in the training facility where they are training.
Prerequisites for training
PADI and SDI Divemaster candidates must have reached the following minimum requirements prior to their Divemaster training:
- Advanced Open Water Diver certification (or qualifying certification from another training organization)
- Rescue Diver certification (or qualifying certification from another training organization)
- First Aid & CPR training (preferably with automated external defibrillator (AED) training)
- 40 logged dives 
- Submit a medical statement signed by a physician within the last 12 months. 
NASE requires Divemaster candidates to also[clarification needed] have demonstrated competency in physics, physiology, skills and environment, dive planning and equipment prior to entering a program.[clarification needed]
PADI Divemaster candidates must have completed 60 logged dives prior to certification as PADI Divemaster.
Divemaster is a NAUI leadership-level certification between Assistant Instructor and Instructor, in contrast to agencies such as PADI that rate Divemaster as the lowest level of leadership qualification. A NAUI Divemaster may organize and conduct dives for certified divers and is qualified to assist active-status NAUI Instructors on diver training courses.
NAUI provides a core of leadership-level skills and knowledge in the NAUI Master Scuba Diver and NAUI Scuba Rescue Diver courses, which are necessary prerequisites for all NAUI leadership programs. Divemaster candidates who offer equivalent certification must still pass the NAUI Master Scuba Diver written examination. Divemaster candidates must either hold a NAUI Assistant Instructor qualification, or have a minimum of 60 logged open water dives demonstrating varied environment, depth and activities, as well as waterskills equal to those expected of an Assistant Instructor.
Holding a NAUI Divemaster certificate is one of three ways in which the diver certification requirements for a NAUI Instructor Training Course may be met.
- "Divers qualified with other agencies T.17". BSAC. 2012. Retrieved 2012-06-08.
- "Competencies of a recreational scuba diver at level 3 "Dive Leader" (ISO 24801-3)". European Underwater Federation (EUF). Retrieved 27 February 2014.
- PADI. "PADI DiveMaster Web Page". Retrieved 2012-02-05.
- This is a declaration that informs the participant that there is some risk involved in diving and states that the participant does not have any contra-indications for diving that are known to the physician."RSTC Medical statement". Retrieved 2012-06-08.
- "NAUI Leadership". Retrieved 2012-03-05.
- "NAUI Instructor Courses". Retrieved 2012-06-07.