The ITI Family of Dive Training Agencies

Emergency Response Diving International

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Emergency Response Diving International (ERDI) is the youngest member of the ITI family, formed in 2000. ERDI provides highly specialized training for police, fire service, and other public safety personnel, addressing search and rescue techniques in various and sometimes hazardous underwater environments, for both divers and dive tenders. Following that tradition of innovation already established by its older siblings, ERDI was the first independent agency to offer this type of formalized curriculum on a national basis. Unlike its siblings, however, many of the ERDI programs fall outside the realm of recreational diving. ERDI programs are compliant with all standards and protocols, applicable in the United States, as mandated by OSHA (Occupational Safety and Health Organization) and NFPA (National Fire Protection Association).

SDI and TDI Leadership Levels

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Divemaster

Divemaster is the initial leadership level in the SDI curriculum. It is here that one effectively makes the transition from diver to professional. It also is here that an individual develops the professional level of diving knowledge and personal diving skills that is expected of all SDI and TDI dive leaders.

The SDI Divemaster is qualified to:

  • Assist an active SDI Instructor during approved sport diving courses, provided the activities are similar to the Divemaster’s prior training;
  • Supervise and conduct dives for certified sport divers, provided the activities are similar to the Divemaster’s prior training.

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SDI and TDI Leadership Levels

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Technical Divemaster

Technical Divemaster is the initial leadership level in the TDI curriculum; prerequisites include certification as both an SDI Divemaster and a TDI technical diver.

The TDI Technical Divemaster is qualified to:

  • Assist an active TDI Instructor during approved technical diving courses, provided the activities are similar to the Divemaster’s prior training;
  • Supervise and conduct dives for certified technical divers, provided the activities are similar to the Divemaster’s prior training.

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SDI and TDI Leadership Levels

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Assistant Instructor

Assistant Instructor is the next higher professional level in the SDI curriculum. Here the individual learns instructional methodology and skills evaluation, and gains practical teaching experience. Prerequisites include certification as an SDI Divemaster (or equivalent).

Naturally the assistant instructor may perform all of the duties of a Divemaster; in addition, the SDI Assistant Instructor is qualified to:

  • Teach and Certify students in the Skin Diver course;
  • Conduct the Inactive Diver / Refresher course;
  • Conduct the Knowledge Quest review in the Open Water Diver course under the guidance of an active Instructor;
  • Teach approved specialties after receiving training in those specialties.

It should be noted that there is no Assistant Instructor leadership level in the TDI curriculum.

SDI and TDI Leadership Levels

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Instructor

An SDI Instructor is the professional primarily responsible for training and certifying sport divers. Prerequisites include certification as an SDI Divemaster or SDI Assistant Instructor (or equivalent). After successful completion of both an Instructor Development Course and an Instructor Evaluation Course, the SDI Instructor independently may conduct all core diver and leadership courses from Open Water Diver thru Assistant Instructor, as well as the Advanced Adventure Diver specialty. An SDI Instructor must be separately qualified and approved for each additional specialty diver course which he or she wishes to offer.

A TDI Instructor is the professional primarily responsible for training and certifying technical divers. Naturally, certification as an SDI Instructor (or equivalent) is a prerequisite, as well as certification as a technical diver at the appropriate level. After successfully completing a Technical Instructor Course for each technical level, the TDI Instructor may conduct technical diver and Technical Divemaster programs at that level.

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SDI and TDI Leadership Levels

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Course Director

Course Director is an advanced Instructor rating within the SDI curriculum. A dive leader at this level may independently conduct the SDI Instructor Development Course (but not the Instructor Evaluation Course). This dive leader also may qualify Instructors and Assistant Instructors to teach approved specialties. The prerequisites for Course Director include documented teaching experience in a wide range of SDI diver and leadership programs.

It should be noted that there is no Course Director rating in the TDI curriculum.

Instructor Trainer

Instructor Trainer is the highest leadership level in the curriculum of both SDI and TDI. As this title implies, Instructor Trainers are responsible for training, evaluating, and certifying SDI and TDI Instructors, as well as SDI Course Directors. Prerequisites for Instructor Trainer include significant and extensive experience as an Instructor. SDI has a single Instructor Trainer rating, while TDI has an Instructor Trainer rating at each technical level.

The RSTC and WRSTC

Recreational Scuba Training Council and World Recreational Scuba Training Council

RSTC The Recreational Scuba Training Council (RSTC) is an association of diver training agencies dedicated to safety in recreational sport diving and the development of consistent minimum training standards. Separate councils have been established in the United States, Canada, Europe, and Japan (the C-Card Council); together these regional councils form the World Recreational Scuba Training Council (WRSTC).

SDI is proud to be a member of RSTC in the United States, Canada, and Europe. Additional members currently include ACUC (Canada, Europe), Barakuda (Europe), DAN-Europe (Europe), IDEA (US, Europe), NASDS (Europe), PADI (US, Canada, Europe, Japan), PDIC (US), PSS (Europe), SNSI (Europe) and SSI (US, Europe, Japan).

RSTC/WRSTC minimum training standards currently address introductory scuba programs, as well as sport diving certifications at the Open Water Diver, Rescue Diver, Nitrox Diver, Dive Supervisor / Divemaster, Assistant Instructor, Instructor and Instructor Trainer levels.

Naturally, all corresponding programs and courses offered by SDI are in compliance with RSTC/WRSTC minimum standards.

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Chapter 2 Quiz

Boyle’s Law

Pressure and Volume Calculations (cont.)

The original formula again can be appropriately transposed to find the ending pressure following a specific change in volume. Here the following formula will apply:

Metric and Imperial:

P2 = [ P1 x V1 ] / V2

Metric Example:If the volume of gas in a flexible container is 8.5 liters at 5 bar, and it expands to 10 liters, its pressure will be 4.25 bar: [5 x 8.5 ] / 10 = 4.25 bar
Imperial Example: If the volume of gas in a flexible container is 5.2 cubic feet at 3 atm, and it compresses to 4 cubic feet, its pressure will be 3.9 atm: [3 x 5.2] / 4 = 3.9 atm

Boyle’s Law

Pressure and Volume Calculations

The following abbreviations appear within the formulas in this section:

  • “P” for pressure
  • “V” for volume

subscript “1” for a starting value

subscript “2” for an ending value

Note: The formulas for converting depth to ambient pressure, and ambient pressure to depth, are addressed in the preceding section on pressure.

Boyle’s Law is depicted mathematically by the following formula:

Metric and Imperial: P1 x V1 = P2 x V2

The components within this formula may be appropriately transposed (rearranged) as needed; for instance, to find the new volume following any change in pressure, the following formula will apply:

Metric and Imperial:

V2 = [ P1 x V1 ] / P2

Metric Example: If the volume of gas in a flexible container at 2.5 bar is 12 liters, what will its volume be at 4.6 bar?
Answer: 6.52 litres: [2.5 x 12] / 4.6 = 6.52 lt
Imperial Example: If the volume of gas in a flexible container at 5.8 atm is 3.1 cubic feet, what will its volume be at 2.3 atm?
Answer: 7.82 cubic feet: [5.8 x 3.1 ] / 2.3 = 7.82 cu ft