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BSAC Extended Range Diver | Big Blue BSAC Diving Centre - Koh Tao Thailand

BSAC Extended Range Diver

erd front 13 001 300x189 BSAC Extended Range Diver

The Extended Range Diver [ERD] course is a full technical diving qualification, enabling you to make deep decompression dives using high percent oxygen nitrox mixes [up to 100% O2] to accelerate your decompression stops during ascent.

The entry requirement is to be certified as both a BSAC Sports Diver and BSAC Technical Advanced Nitrox Diver or equivalent.

The course includes theory, shallow water skill development and executing open water dives to a maximum depth of 50 metres. Lets take a look at each:

Big Blue Package – 35,000 THB
- Air Conditioned Accommodation
- Boat Fees
- Equipment Rental
- Gas fills and Cylinder Fees

- Study Crew Pack with reference CD-Rom
- Big Blue BSAC Club T-Shirt and Mask Strap
- Certification

Theory Lessons

Following the course orientation during which you’ll define extended range diving and the reasons for it, you’ll examine what preparations are necessary for extended range diving – understanding the increased risk of very deep diving, need for training and self reliance, mental and physical preparation and stress management.

You’ll discuss techniques of minimizing and dealing with nitrogen narcosis, and then move onto planning extended range dives. This will include use of dive tables and PC software, then how you’ll actually run the profiles, using dive computers to track depth and time to stick to your run times – usually all recorded on  a slate to manage your profiles, deco mixes and gas switches, and decompression schedule.

Next will be a discussion of the use of nitrox 80 versus 100% oxygen as a decompression gas, and whether to use high oxygen content mixes to accelerate decompression or enhance safety. You’ll review how to track oxygen exposure, then move into gas management, such as applying the rule of thirds to enhance the safety of your extended range dives. Once all the material has been covered, you’ll complete a extended range dive planning exercise.

Next it’s time to examine what equipment is required for extended range diving. We start by looking at personal gear – cylinders, manifolds,  regulators and gauges,  buoyancy compensators, exposure suits and support equipment. You’ll discuss how to properly configure all this gear. Next is group equipment – suitable boat types and other diving platforms, shot lines, decompression trapezes and overall co-ordination.

Finally, you’ll discuss dive plans – objectives, assigning dive teams, role of support divers, emergency and contingency plans, all culminating in you making a full dive plan for an extended range dive.

In water exercises

In the practical sessions, you’ll make a series of dives, working progressively deeper to a maximum depth of 50 metres.

You’ll practice and master many skills such as safety checks and visualization techniques, dealing with out of air situations and gas switching.

You’ll practice fitting and removing stage cylinders underwater, deploying a delayed SMB from depth, ascent procedures and proper position for decompression stops.

Gas management and use of run time slates will be important, plus utilizing lazy shots and decompression trapezes. You’ll work on underwater navigation at depth, deploying and using distance lines on the bottom, use of jon lines and emergency stage cylinders.

You’ll also be involved in briefing support divers and helping to arrange a deco station and emergency equipment, plus much more.

This is a full-on course, which is very challenging. But once you qualify as a BSAC Extended Range Diver the possibilities are endless – get ready for exploration and adventure!

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