Friday, August 17, 2007

TDI - Advanced Nitrox Course - Crescent Lake, Oregon

This course examines the use of EAN-21 through one hundred (100) percent oxygen for optimal mixes to a depth of forty (40) msw/One hundered thirty (130) fsw. The objective of this course is to train divers in the benefits, hazards and proper procedures for utilizing EAN-21 trhough one hundred (100) percent oxygen for dives not requiring staged decommpression.

Thursday, August 16, 2007

IANTD Advanced Recreational Trimix Class - Crescent Lake, Oregon on August 24 - 26, 2007

Beginning on August 24 and going through August 26, 2007, the IANTD Advanced Recreational Trimix course is being offered.

Below is listed some of the particulars for the course.

Advanced Recreational Trimix Diver

A. Purpose

1. This Program is designed to extend the diver’s knowledge in the use of EANx for Sport diving. It further develops diving skills and provides a greater understanding of the EANx concept of diving. It is also intended to supplement the skills of recreational trimix divers.

2. The Program employs EANx mixes from 21% to a maximum of 50% oxygen. For divers qualified as recreational Trimix Divers mixtures of a minimum of 28 % oxygen combined with a Helium content that maintains an END no greater than 80 fsw (24 msw) may be used.

3. This program qualifies divers to perform Trimix Dives outside of training up to 150 fsw (45 msw) and perform decompression stops required dives up to 15 minutes using EAN 50 as a decompression gas.

B. Prerequisites

1. Must be qualified as an IANTD Recreational Trimix Diver with proof of a minimum of 30 logged dives or sufficient experience to satisfy the instructor that the student has the ability and knowledge to continue into this level of training.

2. Must be a minimum of 15 years of age with a parent or guardian authorization, or a minimum of 18 years of age without guardian approval.

C. Texts

1. IANTD Advanced Recreational Trimix Student Manual and Workbook, or equivalent text(s) approved in writing by the Board of Directors (written approval will be issued by IAND, Inc./IANTD World Headquarters).

D. Program Content

1. All Lecture and theory material must be completed.

2. This Program must include a minimum of 120 minutes of OW bottom time completed within 4 dives, 2 of which must be to depths between 100 fsw (30 msw) and 150 fsw (45 msw). If combined with a Deep Diver Program, the total dive time for both Programs must include a minimum of 160 minutes completed within 6 or more dives. Even if the time and skill requirements are met within fewer than 6 dives, the minimum 6 dives must be made. If combined with a Deep Diver Program 3 dives must be made to depths between 100 fsw (30 msw) and 150 fsw (45 msw). All dives deeper than 80 fsw (24 msw) must be made on recreational trimix mixtures.

3. Students are taught the use of Recreational trimix mixtures from 25% to a maximum of 40% oxygen and with a helium content with an END no greater than 80 fsw (24 msw) for diving. EANx mixtures in the range of 41% to a maximum of 50% oxygen are used to for safety and decompression stops.

E. Equipment Requirements

1. A safety or decompression gas cylinder (if used) rigged as either a pony or stage cylinder. Gas cylinders must be oxygen clean and oxygen serviceable where needed.

F. Program Limits

1. There may be no more than 4 students per Instructor. This ratio may be increased by 2 students for each assisting IANTD Divemaster, up to a maximum of 8 students with 2 IANTD Divemasters per class session.

2. No dives may be conducted to depths greater than 150 fsw (45 msw).

3. All dives must be conducted using EANx (maximum 40% oxygen). A higher EANx (maximum 50% oxygen) may be used at the decompression or safety stops.

4. All appropriate safety or required decompression stops must be performed.

5. Mandatory decompression stops are limited to a maximum of 15 minutes.

6. No dives made me made with a PO2 greater than 1.6.

G. Water Skills Development

1. A confined water session must be completed before conducting any OW dives.

2. Demonstrate proficiency in a variety of dive techniques and employ precision buoyancy control.

a. Swim in a simulated out-of-air situation (without breathing, and exhaling slowly) without a mask for a distance of at least 45 feet (15 meters), and commence gas sharing; or appropriate Rebreather gas management drill for out-of air diver. While gas sharing, swim for 3 minutes, then replace and clear mask.

Revision Date August 15, 2003
Copyright 2003 by IAND, Inc. / IANTD All Rights Reserved "The Leader in Diving Education"

Confined Water: yes
Number of Dives: 4 dives
Bottom Time: 120 minutes
Depth Limit: 150 feet
Dives to Specific Depths: 2 dives between 100 and 150 feet

IANTD Text: IANTD Advanced Recreational Trimix Student Manual and Workbook

Text Costs: $35

Certification Fees: $25

Instructor Fees: $495

Gear rental, additional required student manuals, required tables and charts, boat fees, entry fees to dive sites, travel fees, gas fills, etc. are extra and are not included in the listed fees.

Link at

IANTD Recreational Trimix Class - Crescent Lake, Oregon on August 24 - 26, 2007

An International Association of Nitrox and Technical Divers (IANTD) Recreational Trimix Class is to be completed in Crescent Lake, Oregon on August 24 - 26, 2007.

This Program is designed to provide Sport Divers with a breathing medium for extending their dives to Sport Diving Depths by using ENDs in the 40 to 80 fsw (12 to 24 msw) depth ranges. The diver may elect to dive the "mix" on tables or computers.

The IANTD Recreational Trimix Diver qualification may be taught as a single program or combined with a variety of the IANTD Advanced or Specialty Diver Programs.

The Program covers the use of Recreational (Rec) diving mixes in the range of 28 to 40% oxygen with Helium content to provide an END no greater than 80 fsw (24 msw).

The program qualifies divers to do no stop required dives using Recreational Trimix Gas mixtures to a depth of 100 fsw (30 msw) or deeper up to students previous qualification level.

Prerequisites: Must be a qualified Advanced Open Water diver or equivalent and EANx Diver or take the EANx Diver course in conjunction with the Recreational Trimix Diver course.

Link at

TDI – Semi-Closed Circuit Rebreather Instructor and Diver Course - Drager Dolphin

TDI – Semi-Closed Circuit Rebreather Instructor and Diver Course, Unit Specific- DOLPHIN

Drager Dolphin Semi-Closed Rebreather course required dives to be held at Crescent Lake, Oregon on August 25 and 26, 2007.


This is the entry-level certification course for recreational divers wishing to utilize one of the following Semi-closed circuit Rebreathers; Dolphin. The objective of this course is to train recreational divers in the benefits, hazards, and proper procedures for using SCR Rebreathers.

Required Equipment

The following equipment is required for each student:

1. Drager Dolphin Rebreather.
2. Integrated PO2 monitoring device for inhaled PO2.
3. Mask and fins.
4. Exposure suit appropriate for the open water environment.
5. Access to oxygen analyzer.
6. Appropriate weight.
7. Bailout cylinder (minimum size 3L / twelve (12) cu. ft.)
8. Flow meter.

The Rebreather Manual and the manufactures’ manual are mandatory for use during this course.

The following topics must be covered during this course:

1. History and Evolution of Rebreathers.
2. Comparison of Open Circuit, Closed Circuit, and Semi-closed Circuit.
3. Practical Mechanics of the System

A. Assembly and disassembly of the Rebreather.
B. Layout and design.
C. Scrubber recharge.
D. System maintenance.
E. Breathing loop decontamination procedures.
4. Review of nitrox
A. Dalton’s Law (triangle)
B. Optimum nitrox mix
C. Oxygen Tracking
D. Gas preparation
E. Dive planning examples
5. Gas physiology
A. Oxygen toxicity.
B. Hyperoxia.
C. Hypoxia.
D. Asphyxia
E. Hypercapnia
F. Nitrogen absorption.
G. CO2 toxicity.
H. Gas consumption.
i. Cylinder sizes
ii. Depth and workload
6. Formula work / metabolic consumption
A. 02 metabolizing calculations.
B. Inspired 02 calculations (Rebreather Equation).
C. Equivalent air depth.
7. Dive Tables
A. Inspired 02 table.
B. Equivalent air depth.
8. Dive Computers
A. Mix adjustable.
B. 02 integrated.
C. P02 monitoring devices
9. Problem Solving
A. Canister flooding
B. Mouthpiece loss
C. Scrubber exhaustion
D. Battery or sensor loss
E. Breathing Bag rupture
F. Open circuit bailout system
i. On board gas
ii. Off board gas
G. Hyperoxia scenario
H. Hypoxia scenario
I. hypercapnia scenario
J. Post problem maintenance of equipment
10. Dive Planning
A. Operational Planning
i. Gas requirements.
ii. Oxygen limitations.
iii. Nitrogen limitations.

Required Skill Performance and Graduation Requirements:

The dive depth shall not exceed one point six (1.6 ATM) P02.

The following skills must be completed by the student during open water dives:

1. Properly analyze gas mixture.
2. Perform all pre dive checks (positive, negative, flow rate, by-pass regulator operation, relief valve pressure) a minimum of six (6) times.
3. Demonstrate a leak check and repair scenario.
4. Not required for the Dolphin.
5. Properly packing a scrubber canister a minimum of two (2) times (if using the ExtendAir cartridge one packing must be with granular material).
6. Properly execute set-up and breakdown a minimum of four (4) times for Draeger rebreathers.
7. Demonstrate adequate pre-dive planning.
A. Limits based on system performance.
B. Limits based upon oxygen exposures at planned depth with mix.
C. Limits based upon nitrogen absorption at planned depth with mix.
8. Properly execute the planned dives within all pre-determined limits.
9. Properly execute a recovery from a system failure and switch to bail-out stationary a minimum of two (2) times.
10. Properly execute a recovery from a system failure and switch to bail-out hovering a minimum of two (2) times, one of the bail-out scenarios the diver must switch to open circuit and complete dive and safety stop on open circuit (direct ascent must begin when diver switches to open circuit, this scenario should be conducted no deeper than 60 fsw / 20 meters).
11. Properly demonstrate hose clearing technique after each bail-out scenario.
12. Not required on a Dolphin.
13. Proper PO2 monitoring on all dives (if unit is equipped with P02 monitoring device).
14. Properly execute a mask clearing exercise with emphasis on minimal gas loss.
15. Safely and properly execute a buddy out of air scenario, it is preferable the buddy is on a SCR unit also.
16. Diver will demonstrate actual safety stops at pre-determined depths.
17. Properly execute cleaning and maintenance of the Rebreather, including breathing loop decontamination.

Course Structure and Duration

Open Water Execution:

A minimum of four (4) dives with a minimum of one hundred (100) accumulated minutes for the Drager units.

Course Structure:

1. Structure of the course is according to the number of students participating and their skill level.


1. The minimum number of classroom and briefing hours is six (6).

In order to complete this course, students must:

1. Satisfactorily complete the TDI Rebreather Course written examination.
2. Complete all open water requirements safely and efficiently.
3. Demonstrate mature, sound judgment concerning dive planning and execution.

Qualifications of Graduates

Upon successful completion of this course, graduates may engage in no decompression diving activities utilizing the Dolphin to a maximum depth of forty (40) msw / one hundred thirty (130) feet, without decompression utilizing nitrox mixes not exceeding their level of certification.

Please email if you are interested or want additional information.