Recreational Diver Level 3 - Trimix Diver
188.8.131.52 Course Outcomes
The GUE Recreational Diver Level 3 course is a limited decompression course structured to prepare divers for deeper recreational diving while using sound equipment, efficient diving skills, and advanced breathing mixtures. Course outcomes include, but are not limited to: skill cultivation and refinement, knowledge of relevant physics and physiology, familiarity with the theory and practice of decompression, correct ascent procedures, the use of double back-gas tanks/cylinders, the use of Nitrox for decompression, the use of normoxic Helium (30/30 and 21/35) to minimize narcosis, CO2, gas density, and post-dive “nitrogen stress,” and the use of a single decompression cylinder for stage decompression techniques.
Applicants for a Rec 3 course must:
Submit a completed registration form, a medical history, and a liability release to GUE
Be physically and mentally fit.
Hold insurance that will cover diving emergencies such as hyperbaric treatment, e.g.
DAN Master-level insurance or equivalent.
Be a nonsmoker.
Obtain a physician’s prior written authorization for the use of prescription drugs, except
for birth control, or for any prior medical condition that may pose a risk while diving.
Be a minimum of 18 years of age.
Have passed GUE Recreational Level 2 or GUE Fundamentals with at least a “recreational” pass.
Have completed the GUE Doubles Primer course or be proficient in doubles with at least 25 experience dives.
Have a minimum of 75 non-training dives.
184.108.40.206 Course Content
The Recreational Diver Level 3 course is normally conducted over five days, and includes eight dives and at least forty hours of instruction, encompassing classroom, land drills and in-water work.
220.127.116.11 Rec 3 Specific Training Standards
Student-to-instructor ratio is not to exceed 6:1 during land drill or surface exercises; it cannot exceed 3:1 during any in-water training.
Maximum depth of 130 feet/39 meters.
No overhead diving.
Dives should not be planned to incur more than 15 minutes of total ascent time as
established by GUE’s DecoPlanner.
Critical skills may only be performed up to a maximum depth of 30 feet/9 meters.
18.104.22.168 Required Training Materials
GUE training materials and recommended reading as determined by the course study packet received via online download after GUE course registration.
22.214.171.124 Academic Topics
Introduction: GUE organization and course overview (objectives, limits, expectations)
Applied diving physics
Applied diving physiology
Introduction to normoxic Trimix
Dive planning and gas management
Understanding inert gas on-gassing and elimination
Decompression practices while using nitrox
Decompression planning using decompression tables and DecoPlanner
GUE equipment configuration
Dive planning and logistics
126.96.36.199 Land Drills & Topics
Dive team order and protocols
GUE-EDGE and pre-dive drill
Out–of-gas scenarios and touch contact
Valve management including failure procedures
Use of safety spools and lift bag
Ascent and decompression protocols
188.8.131.52 Required Dive Skills & Drills
Must be able to swim at least 300 yards/275 meters in less than14 minutes without stopping. This test should be conducted in a swimsuit and, where necessary, appropriate thermal protection.
Must be able to swim a distance of at least 50 feet/15 meters on a breath hold while submerged.
Demonstrate proficiency in safe diving practices; this would include pre-dive preparation, in-water activity, and post-dive assessment.
Demonstrate awareness of team member location and a concern for safety, responding quickly to visual indications and dive partner requirements.
Demonstrate proficiency in lift bag/surface marker buoy deployment.
Demonstrate good buoyancy and trim, i.e. approximate reference is a maximum of 30
degrees off horizontal while remaining within 5 feet/1.5 meters of a target depth.
Efficiently and comfortably demonstrate how to donate gas to an out-of-gas diver in
multiple gas-sharing episodes.
Demonstrate three propulsion techniques. Students should demonstrate
comprehension of the components necessary for a successful backward kick.
Demonstrate proficiency during gas-sharing scenarios, including a gas-sharing horizontal
swim and a direct ascent while managing decompression obligations.
Demonstrate proficiency in the use of touch contact communication during out-of-gas
Demonstrate proficiency in the use of the primary light including passive and active
Demonstrate proficiency with a single decompression cylinder.
Demonstrate proficiency with valve-management by conducting a GUE valve drill.
Demonstrate proficiency with proper ascent/descents, deep stops and safe gas
15. Demonstrate proficiency in surfacing an unconscious diver from depth.
16. Demonstrate basic equipment proficiency and an understanding of the GUE equipment
184.108.40.206 Equipment Requirements
GUE base configuration as outlined in Appendix A, plus:
GUE double tank configuration
Primary and back-up lights
Small argon regulator and bottle (if appropriate for local conditions)
Prior to the commencement of class, students should consult with a GUE representative to verify equipment requirements and appropriateness of any selected equipment.