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@SOUTH WEST TECHNICAL DIVING
COURSES AND AGENCIES
EXTENDED RANGE DIVER (ERD LEVEL 4)
This program is designed to bridge the gap between the advanced / decompression diver and the deep explorer. The ERD program is a diving oriented course with extensive practical diving included.
The ERD course may be a stand alone program or taught in conjunction with either the TSD or the TMD course but not both. The following topics will be stressed: gas supply management, decompression table selection, team functioning and mission planning relative to longer and deeper dives. The maximum recommended depth in this program is 50 msw.
This course prepares the diver for ultra-deep, “mission-oriented” dives and entry into the Tri-mix Exploration Program. This is an equipment intensive course requiring extensive counseling by the ANDI ERD Instructor. 6 – 8 hours of lecture and 3+ open water dives are required for certification.
Minimum bottom time for the dives is 240 minutes.
| Standards | Technical SafeAir® Diver TSD L3 | Technical Tri-Mix Diver TTM L3 | Extended Range Diver ERD L4 | Intermediate Tri-Mix Diver ITM L4 | Tri-Mix Diver TMD L5 |
|---|---|---|---|---|---|
| Maximum Course Depth *1 | 130 fsw/40 m | 165 fsw/50 m | 165 fsw/50 m | 200 fsw/60 m | 328 fsw/100 m |
| Minimum Course Depth *2 | 100 fsw/30 m | 100 fsw/30 m | 130 fsw/40 m | 165 fsw/50 m | 197 fsw/60 m |
| Min. Dive Depth for Certification *3 | 72 fsw/22 m | 100 fsw/30 m | 100 fsw/30 m | 130 fsw/40 m | 165 fsw/50 m |
| Max Deco *4 | 30 min | 45 min | As Required | As Required | As Required |
| Max. PO2 for Deco | 1.6 PO2 | 1.6 PO2 | 1.6 PO2 | 1.6 PO2 | 1.6 PO2 |
| Gas Limits – Oxygen | 1.45 PO2 | 1.45 PO2 | 1.45 PO2 | 1.45 PO2 | 1.45 PO2 |
| Gas Limits – Nitrogen | 3.6 PN2 | 3.6 PN2 | 3.6 PN2 | 3.6 PN2 | 3.6 PN2 |
| Gas Limits – Helium | None | 16% or more | None | As Required | As Required |
| Theory Time | 14 – 16 hours | 4 – 6 hours*5 | 6 – 8 hours | 8 hours | 8 hours |
| # of Dives | 4*7 | 4*7 | 4*7 | 4*7 | 4*7 |
| Min. Bottom Time | 80 min | 100 min | 120 min | 80 min | 80 min |
| Min. Run-Time incl Safety Stops | 120 min | 180 min | 240 min | 240 min | 240 min |
| Equipment configuration limitation | 3 cylinders 3 gases |
3 cylinders 3 gases |
As required | As required | As required |
| Prerequisites *6 | CSU +50 dives | TSD | TSD +100 dives | ERD +200 dives | ERD +200 dives |
*2 – At least one training dive must meet this minimum.
*3 – Other than the first evaluation dive no shallower dive may be credited toward certification.
*4 – One deco cylinder must cover all stops and bail out.
*5 – Includes all TMD info from L5 course.
*6 – Other prerequisites may apply.
*7 – Team members must use the same gas mixtures.
Note 1: divers may only move 2 levels during one course series. In order to move levels the candidate must have 25 dives at the ERD level.
Note 2: Extended Range Diver L4 program is an option for ideal conditions when helium is not available, otherwise Intermediate Tri-Mix L4 is the best option.
Note 3: Extended Range Diver L4 program encompassing PN2 greater than 3.6 Bar but less than 4.5 Bar requires a Standards Waiver request to IHQ or RHQ. The waiver is applicable in clear, warm waters only.
Our cave experience encompasses Irish and UK caves, France, Italy, Mexico, Florida, Philippines, Spain and more. We are experienced in open circuit from Mexico style sidemount to full CCR. We can train you to expedition level including mixed gas.
The pathway will not be fast, there will be no shortcuts, but we will be delighted to dive any cave with you when done!
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