Extended Range Diver - Technical Divers

The TDI Extended Range course provides the training and experience required to competently utilize air for dives up to 180 feet/55metres that require staged decompression, utilizing Nitrox mixtures or oxygen during decompression. The course concentrates on the proper techniques, equipment requirements, and hazards of deep air.

All students MUST wear, and be proficient in, either backmounted doubles or sidemount system for this course.

This course builds on the fundamental knowledge base developed throughout the Advanced Nitrox and Decompression courses. Carrying travel stages, not just for decompression, is a big part of the class. Extending the diving range doesn't necessarily mean diving "deep", it can simply mean diving for a longer duration. As with all the courses in the TDI training program, the Extended Range course will add more knowledge and a variety skills to your diving repertoire leaving students more qualified and confident to undertake more challenging and adventurous dives.

We often teach this course in conjunction with the TDI Normoxic Trimix Diver course.

Agencies we teach for:

Course Cost:
See Prices Page

This includes your TDI Extended Range study guide, your dive training, a certification card and photos (above and below water).

Other costs:
What not included is gear hire, gas fills, food, lodging, dive site fees & transportation. Dive site fees range from $15-$40, depending on site. Often we visit the ocean to get our required depth for dives, and charters range from $60-$100 per person. We use nitrox and oxygen for decompression gasses during the Extended Range Course, which cost more than air.

Gear you need to provide:

You will need to own your own scuba gear:
* Low volume mask and appropriate fins
* Bottom Mix Cylinders: All students MUST utilize a double tank system, either backmounted doubles or sidemount tanks, and equipped with DIN valves.
Whatever volume tanks are chosen, they must supply sufficient gas to complete class dives. To sign up for this course you need to already be comfortable and proficient diving in a dual tank system. These tanks must be properly labeled as required for EANx mixtures, and equipped with 2 appropriate regulators (must be high performance, and serviced within the last year).
* Travel Mix Cylinder (if used) which must have a volume appropriate for planned dive and student gas consumption, be labeled in accordance with TDI Standards, and have an appropriate regulator.
* Decompression Mix Cylinders which must have a volume appropriate for planned dive and student gas consumption, be labeled in accordance with TDI Standards, and have an appropriate regulator.
* Back plate and wing setup (with sufficient lift to manage tanks)
* Depth gauge and automatic bottom timer and/or dive computer
* BCD with power inflator
* Exposure suit adequate for the dive environment (dry suit preferred)
* Air tables or computer planning software, and appropriate redundancy.
* 2 line cutting devices (recommended is a Z knife, to be arm or chest mounted).
* Slate or wetnotes with pencil
* Liftbag and appropriate length reel/spool
* Redundant light system if needed for site conditions.

What the course entails:
The Extended Range course is an academic and water based course that builds on the knowledge and skills acquired during the advanced nitrox and decompression courses. This course examines the theory, methods and procedures of planned stage decompression in deep air diving, and then lets the students have practical diving experience by planning, and flawlessly executing no less than 6 staged decompression deep air dives.

How we teach it:
There are two parts, the academics and the wet portion.


The academics are done mostly at home from your TDI Extended Range Study Guide. This guide is very well structured, a very informative learning tool, and an excellent alternative to multiple day or evening lectures. Some topics covered are:
* History of Deep Air Diving
* Physics
* Physiology
* Decompression options
* Equipment considerations
* Dive tables vs computer generated tables
* Dive planning, and emergency planning and procedures

When you meet with your Instructor he/she will review the academics and you will complete a written test. You need to achieve at least 80% on your written test to pass. Detailed dive briefings and land drills will precede the diving.

Land Drills

* Selection and preparation of equipment suitable for soft overhead environments and long decompression requirements.
* Demonstrate familiarity with basic and technical hand signals, gas switching procedures, gas matching among team members
* Demonstrate adequate pre-dive planning using limits based on personal gas consumption, oxygen exposures at planned depth with actual mix for decompression profiles.

Wet Training

For the wet training, we typically do three days in the water: at least 6 dives, with a minimum accumulated bottom time of 100 minutes. All dives must be deeper than 100 feet (30m), and four dives must be deeper than 130 feet (40m).
During these dives we complete a variety of skills such as:

* Demonstrate buoyancy control (ability to hover at fixed position in water column without moving hands or feet) at all times.
* Demonstrate excellent gas management
* Demonstrate competence managing two stage cylinders, including drop and recovery, and show comfort swimming at the surface and at depth carrying decompression stage cylinders.
* Show good awareness of buddy and other team members through communications, proximity and team oriented dive practices
* Conduct appropriate decompression stops while maintaining neutral buoyancy
* Conduct team oriented and solo drills for lift bag deployment
* Demonstrate ability to share air with a buddy as both recipient and donor in a controlled manner while maintaining position in water column. Demonstrate buddy breathing procedures for at least one minute.
* Throughout all dives demonstrate mature, sound judgment concerning dive planning and execution.
* Properly execute the planned dive within all pre-determined limits.
* Demonstrate appropriate modifications to decompression schedule for emergency purposes
* Narcosis checks and management

Note: this is not a fully inclusive list, just an overview!

Planning and flawlessly executing dives is a skill that students must demonstrate during their Extended Range Course

All dives will include a pre-dive briefing, START check, safety stop and post dive critique.
START is an acronym for pre dive checks as follows: S-Drill (OOA drill and Bubble Check), Team (buddy equipment checks), Air (gas matching), Route (entry/exit and planned path underwater), Tables (depth, duration, waypoints and schedule).

It should be noted that participation in the Extended Range class does not guarantee certification. Each student must do the required number of dives, all the skills, and demonstrate that they are comfortable with planning and executing safe dives utilizing multiple gasses before they receive their certification card.

After successful completion of your academics and water work, you will awarded your certification as a Extended Range Diver.

Here at Dayo Scuba we also mentor our students (at no extra cost), so you can also gain additional experience in this type of diving with us after your have completed your course.

Age requirements:
You must be at least 18 years old to receive a Extended Range certification, there is no maximum age.

Minimum number of students per class:
We need 2 or more people to make a Extended Range class; private, one-on-one classes can be organized for a separate fee.

How many people are in each class?
Our Decompression Procedure classes range in size, from 1-3 students (3 is the maximum per instructor).

Schedule/Timing for Extended Range Courses:
We train all the time, and have multiple instructors on staff, many full time, so we do weekday and weekend classes.

Call us or check out our Calendar for dates of upcoming courses.

How long does the course take?
Usually we complete the wet portion of the Extended Range course in 3 days , with at least six dives. Sometimes it is necessary to be in the water more than 3 days because of learning difficulties or weather issues. If necessary, you can come back, free of charge, and join in another Extended Range Course to finish your training. We will also train you for any extra days you may need to get you properly certified. It is our mission to make you a safe and competent diver.

Where we do our course:
We usually do our Extended Range training here around Orlando or in North Florida. We try to dive two different sites for the deco course, day one is usually a basic site, and day two is more advanced site. Common choices for training are Hudson Grotto, Forty Fathoms Grotto and the ocean. If you are cave trained/training, we have a lot more sites to choose from.

Hyperlink all the dive sites.

Prerequisites for Course:

* You must be Advanced Nitrox and Decompression certified

* Minimum age: 18 years old.

* Minimum of 100 logged open water dives, of which twenty (25) must be deeper than 100 feet.

* Before participating in the Extended Range course, you will be asked to fill out a standard liability release form and a medical statement. If you answer YES to anything on the medical form we will require that you get it signed off by a physician.

*Technical Diver Training - Dayo Scuba Orlando Florida is required for all technical dive courses.

* This class requires that all student divers already have excellent buoyancy skills. Do NOT take this class if you have none.

What you can do afterwards:

For many divers, this course will open up a large number of dives previously beyond the scope of their training. The course leaves you qualified to go out and perform staged decompression dives up to a depth of 180 feet. There are plenty of skills introduced on the course to go out and practice and refine.

* You can dive for longer and deeper!

* There are plenty of skills introduced on the course to go out and practice and refine

* You will be a safer, more competent and comfortable diver after completion of your Extended Range course…..knowing you are a better diver, that now has the ability to multi-task while diving.

* The safe diving practices learned during your extended range course will apply to all types of diving you do in the future, including open water recreational diving.

* Continue your diver training with more specialized training; the TDI Normoxic Trimix Course is a common follow up to this course.