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The Scuba Doctor has a great range of quality dive computer solutions for technical and rebreather divers.

Decompression Algorithms: ZHL-16C, VPM-B, DCAP, DCIEM, VVAL-18M... Does It Really Matter?

At the risk of annoying those who do have a preference for a specific decompression algorithm, the simple answer for most divers is NO the algorithm is not critical. There is no expert consensus that any one of the current crop of decompression algorithms is better than another. All of these algorithms used in dive computers and desktop table generation software, when set to their default conservancy values, will get you out of the water with an acceptable margin of safety. What we can say for sure is they are all imperfect representations of actual decompression in humans.

Numerous variants of ZHL-16C are very widely implemented in both sport and technical dive computers. For technical diving, versions of ZHL-16C that include user configurable Gradient Factor modifications are very popular because the GF values can be 'tuned' to provide different types of profiles for specific types of diving. VPM-B dive profiles typically have deeper initial stops, along with reduced time at shallow depths resulting in a 'smoother' profile although recent research calls into question the benefits of 'deep stops' especially for lengthy VPM-B profiles. DCAP was developed for use by early extended range divers (today we call them 'technical divers'.) VVAL-18M is the basis for the modern US Navy Tables. DCIEM has been extensively tested by the Canadian military to ensure its applicability to cold water working divers. RGBM (basis for NAUI tables with its roots in VPM) and DSAT (basis for PADI tables) are most often seen in no stop required sport diving applications. Recently, the RGBM model has been called in to question by a legal action, but it's not clear if the issue is with the algorithm itself or a specific dive computers' implementation, as most experts consider the RGBM model to be very conservative especially on repetitive dives.

The practices of decompression are not exact, in many ways as much about skill as science. Much of what we do in decompression diving is based on empirical observation and experience, rather than having a basis in theoretical science. Dr. R W (Bill) Hamilton, the late co-developer of DCAP and whose research in decompression is widely acknowledged as having a key role in opening up recreational extreme exposure diving in the early 90s, was fond of the saying 'what works, works'. The most important safety factor is not the decompression algorithm you select, rather your skill as a diver and that you closely follow the recommendations of that algorithm and safe diving practices in general. Also, best practice when diving as a team is that all divers should use the same algorithm in order to remain together as a team during ascent phase of the dive plan.


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Shearwater Research
Shearwater Research Petrel 2
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computers

Shearwater Research Petrel 2

The Shearwater Research Petrel 2 OC/CC SA dive computer with Titanium bezel is a rugged and reliable technical dive computer with a whole range of...
$1,450.00

Max: 2
FREE SHIPPING
Shearwater Research
Shearwater Research Petrel 2 OC/CC - Fischer
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computers

Shearwater Research Petrel 2 OC/CC - Fischer

The Shearwater Research Petrel 2 Fischer OC/CC EXT dive computer has all the modes and features of the Petrel 2, plus incorporates a Fischer 103 I/O...
$1,850.00

Max: 1
FREE SHIPPING
Shearwater Research
Shearwater Research SWIFT HP Wireless AI Transmitter
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research SWIFT HP Wireless AI Transmitter

The Shearwater Research Swift is the next generation of smart air-integrated wireless tank-pressure transmitters. The Swift allows divers to carry...
$650.00
Shearwater Research
Shearwater Research Perdix 2 TI Black Computer
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computers

Shearwater Research Perdix 2 TI Black Computer

The Shearwater Research Perdix AI dive computer incorporates a powerful feature set, easy to understand menus, and easy to read full-colour display....
$1,775.00
FREE SHIPPING
Shearwater Research
Shearwater Research Perdix 2 TI Dive Computer
Category Path: Top 10 Products > Top 10 Best Dive Computers

Shearwater Research Perdix 2 TI Dive Computer

The Shearwater Research Perdix TI dive computer incorporates a powerful feature set, easy to understand menus, and easy to read full-colour display....
$1,775.00
FREE SHIPPING
Shearwater Research
Shearwater Research Teric Watch Computer - BLACK
Category Path: Top 10 Products > Top 10 Best Dive Computers

Shearwater Research Teric Watch Computer - BLACK

The Shearwater Research Teric brings divers an everyday timepiece and dive computer of unprecedented capabilities. Different watch faces,...
$1,835.00
FREE SHIPPING
Shearwater Research
Shearwater Research Teric Watch Computer - SILVER
Category Path: Top 10 Products > Top 10 Best Dive Computers

Shearwater Research Teric Watch Computer - SILVER

The Shearwater Research Teric brings divers an everyday timepiece and dive computer of unprecedented capabilities. Different watch faces,...
$1,835.00
FREE SHIPPING
Shearwater Research
Shearwater Research NERD 2 Dive Computer - Fischer
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computers

Shearwater Research NERD 2 Dive Computer - Fischer

The Shearwater Research NERD 2 Fischer is a heads up (HUD) display, advanced hands-free technical diving computer for open and closed circuit divers....
$3,400.00
FREE SHIPPING
Garmin
Garmin Descent T1 Transmitter
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Garmin Accessories

Garmin Descent T1 Transmitter

Track your every breath when you pair the Garmin Descent™ T1 transmitter with a Garmin Descent Mk2i dive computer. Monitor up to 5 cylinders...
$699.00
Suunto
Suunto Wireless Tank Pressure Transmitter LED
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Suunto Accessories

Suunto Wireless Tank Pressure Transmitter LED

Monitor Cylinder Pressure and Air Consumption Data Wirelessly From Your Suunto D-series, Vyper Air, Vytec or HelO2 Dive Computer With the Suunto...
$449.00
Suunto
Suunto Tank POD Multi Transmitter for EON/D5 Dive Computers
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Suunto Accessories

Suunto Tank POD Multi Transmitter for EON/D5 Dive Computers

The Suunto Tank POD Multi Transmitter for Suunto EON and D5 dive computers allows you to quickly and easily view your tank pressure from your Suunto...
$549.00
Suunto
Suunto USB Download Cable for New D-series DX D9tx D6i D4i
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Suunto Accessories

Suunto USB Download Cable for New D-series DX D9tx D6i D4i

The new Suunto D-Series USB Interface Cable enables you to connect your D-Series dive computer to your PC and download your dive data. The new cable...
$129.00
Shearwater Research
Shearwater Research Upgrade to DCIEM Algorithm
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Upgrade to DCIEM Algorithm

The Shearwater Research upgrade to the DCIEM Algorithm for Commercial Diving is supported only by the current firmware version of your Shearwater...
$195.00
Shearwater Research
Shearwater Research Upgrade to VPM-B Deco Algorithm
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Upgrade to VPM-B Deco Algorithm

The Shearwater Research VPM-B software feature upgrade allows your Shearwater Research Predator, Petrel, Petrel 2, Perdix, Perdix AI, NERD, or NERD 2...
$100.00
Mares
Mares Genius Dive Computer - NO Transmitter
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computers

Mares Genius Dive Computer - NO Transmitter

Mares Genius Dive Computer - NO Transmitter. The Mares Genius Dive Computer is a colour screen dive computer made for any diver whether you dive air,...
$1,739.95
FREE SHIPPING
Garmin
Garmin Descent Mk2i Watch Dive Computer with Black Band
Category Path: Computers Gauges and Compasses > Dive Computers

Garmin Descent Mk2i Watch Dive Computer with Black Band

The Garmin Descent Mk2i watch-sized dive computer with Carbon Grey DLC coated Titanium bezel and Black band features Air Integration . By adding...
$2,499.00
Garmin
Garmin Descent G1 Solar Watch Dive Computer | Black
Category Path: Computers Gauges and Compasses > Dive Computers

Garmin Descent G1 Solar Watch Dive Computer | Black

Please Note: Only available in BLACK. Hurricane Blue has been discontinued by Garmin Descent G1 series of dive computers. Just like the brand’s...
$1,099.00
FREE SHIPPING
Suunto
Suunto Scratch Guard for EON Steel Dive Computer
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Suunto Accessories

Suunto Scratch Guard for EON Steel Dive Computer

This perfectly fitting, genuine Suunto scratch guard provides advanced display protection for Suunto EON Steel dive computers without restricting the...
$22.00
Suunto
Suunto Air Flow Restrictor Tank POD Kit
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Suunto Accessories

Suunto Air Flow Restrictor Tank POD Kit

The Suunto Air Flow Restrictor Tank POD Kit contains one Type A and one Type B air flow restrictor for use with all Suunto Wireless Tank Pressure...
$29.99
Suunto
Suunto EON Steel Bungee Adaptor Kit
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Suunto Accessories

Suunto EON Steel Bungee Adaptor Kit

The Suunto EON Steel Bungee Adaptor Kit is used to mount a Suunto EON Steel dive computer with bungee cords on your wrist. Complete kit for switching...
$45.00
Suunto
Suunto EON Steel Protective Boot
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Suunto Accessories

Suunto EON Steel Protective Boot

The Suunto EON Steel Protective Boot is a rubber boot for advanced protection of your Suunto EON Steel dive computer. This boot can be easily slipped...
$35.00
Shearwater Research
Shearwater Research Teric Replacement Charger
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Teric Replacement Charger

The Shearwater Research Teric Replacement Charger is the factory replacement or additional Shearwater OEM charging stand designed to inductively /...
$60.00
Shearwater Research
Shearwater Research Peregrine Replacement Charging Pad
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Peregrine Replacement Charging Pad

The Shearwater Research Peregrine Replacement Charging Pader is the factory replacement or additional Shearwater OEM charging stand designed to...
$60.00
Shearwater Research
Shearwater Research Ballistic Nylon Carrying Case (Medium)
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Ballistic Nylon Carrying Case (Medium)

The Shearwater Ballistic Nylon Carrying Case is a protective case with zip suitable for Teric, Perdix and Petrel dive computers. Comes in small,...
$30.00
Garmin
Garmin QuickFit 26 Watch Band (Descent Mk1) Silicone | Grey
Category Path: Computers Gauges and Compasses > Instrument Accessories / Parts

Garmin QuickFit 26 Watch Band (Descent Mk1) Silicone | Grey

Swap, click and go with this 26 mm wide interchangable band for your Garmin Descent Mk1 dive watch. This silicone band with metal closure allows you...
$79.00
Garmin
Garmin QuickFit 26 Watch Band (Descent Mk1) Silicone | Spearmint
Category Path: Computers Gauges and Compasses > Instrument Accessories / Parts

Garmin QuickFit 26 Watch Band (Descent Mk1) Silicone | Spearmint

Swap, click and go with this 26 mm wide interchangable band for your Garmin Descent Mk1 dive watch. This silicone band with metal closure allows you...
$79.00
Garmin
Garmin USB Charging/Data Clip (Descent Series)
Category Path: Computers Gauges and Compasses > Instrument Accessories / Parts

Garmin USB Charging/Data Clip (Descent Series)

Connect your Garmin Descent Mk2 watch dive computer to this charging clip and use the attached USB interface to plug into your computer or power...
$39.00
Shearwater Research
Shearwater Research Peregrine Coloured Replacement Strap - Black
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Peregrine Coloured Replacement Strap - Black

Shearwater Research Peregrine Coloured Replacement Strap - Black. Each Shearwater Research Peregrine dive computer comes with a 26 mm silicone Black...
$80.00
Shearwater Research
Shearwater Research Peregrine Coloured Replacement Strap - White
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Peregrine Coloured Replacement Strap - White

Shearwater Research Peregrine Coloured Replacement Strap - White. Each Shearwater Research Peregrine dive computer comes with a 26 mm silicone Black...
$80.00
Shearwater Research
Shearwater Research Teric Black Extender Strap (Single)
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Teric Black Extender Strap (Single)

The Shearwater Research Teric Black Extender Strap is the factory replacement 22 mm wide black silicone extension band for your Shearwater Teric...
$30.00
Shearwater Research
Shearwater Research Teric Strap Kit-SINGLE Colour - Teal
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Teric Strap Kit-SINGLE Colour - Teal

Shearwater Research Teric Strap Kit-SINGLE Colour (10 Options) - Teal. The Shearwater Research Teric Single Colour Strap Kit is a replacement 22 mm...
$80.00
Shearwater Research
Shearwater Research Teric Strap Kit-SINGLE Colour - Black
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Teric Strap Kit-SINGLE Colour - Black

Shearwater Research Teric Strap Kit-SINGLE Colour (10 Options) - Black. The Shearwater Research Teric Single Colour Strap Kit is a replacement 22 mm...
$80.00
Shearwater Research
Shearwater Research Teric Strap Kit-SINGLE Colour - OD Green
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Teric Strap Kit-SINGLE Colour - OD Green

Shearwater Research Teric Strap Kit-SINGLE Colour (10 Options) - OD Green. The Shearwater Research Teric Single Colour Strap Kit is a replacement 22...
$80.00
Shearwater Research
Shearwater Research Teric Strap Kit-SINGLE Colour - Brown
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Teric Strap Kit-SINGLE Colour - Brown

Shearwater Research Teric Strap Kit-SINGLE Colour (10 Options) - Brown. The Shearwater Research Teric Single Colour Strap Kit is a replacement 22 mm...
$80.00
Shearwater Research
Shearwater Research Teric Strap Kit-SINGLE Colour - Navy Blue
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Teric Strap Kit-SINGLE Colour - Navy Blue

Shearwater Research Teric Strap Kit-SINGLE Colour (10 Options) - Navy Blue. The Shearwater Research Teric Single Colour Strap Kit is a replacement 22...
$80.00
Shearwater Research
Shearwater Research Teric Strap Kit-SINGLE Colour (10 Options) -
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Teric Strap Kit-SINGLE Colour (10 Options) -

Shearwater Research Teric Strap Kit-SINGLE Colour (10 Options) - Yellow. The Shearwater Research Teric Single Colour Strap Kit is a replacement 22 mm...
$80.00
Shearwater Research
Shearwater Research Teric Strap Kit-SINGLE Colour - White
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Teric Strap Kit-SINGLE Colour - White

Shearwater Research Teric Strap Kit-SINGLE Colour (10 Options) - White. The Shearwater Research Teric Single Colour Strap Kit is a replacement 22 mm...
$80.00
Shearwater Research
Shearwater Research Teric Straps Kit-DUAL Colour (5 Options) - Y
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Teric Straps Kit-DUAL Colour (5 Options) - Y

Shearwater Research Teric Straps Kit-DUAL Colour (5 Options) - Yellow. The Shearwater Research Teric Dual Colour Strap Kit is a replacement 22 mm...
$80.00
Shearwater Research
Shearwater Research Teric Straps Kit-DUAL Colour (5 Options) - W
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Teric Straps Kit-DUAL Colour (5 Options) - W

Shearwater Research Teric Straps Kit-DUAL Colour (5 Options) - White. The Shearwater Research Teric Dual Colour Strap Kit is a replacement 22 mm wide...
$80.00
Shearwater Research
Shearwater Research Teric Straps Kit-DUAL Colour (5 Options) - G
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Teric Straps Kit-DUAL Colour (5 Options) - G

Shearwater Research Teric Straps Kit-DUAL Colour (5 Options) - Green. The Shearwater Research Teric Dual Colour Strap Kit is a replacement 22 mm wide...
$80.00
Shearwater Research
Shearwater Research Teric Straps Kit-DUAL Colour (5 Options) - B
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Teric Straps Kit-DUAL Colour (5 Options) - B

Shearwater Research Teric Straps Kit-DUAL Colour (5 Options) - Blue. The Shearwater Research Teric Dual Colour Strap Kit is a replacement 22 mm wide...
$80.00
Shearwater Research
Shearwater Research Straps Kit for Perdix and Petrel
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Straps Kit for Perdix and Petrel

The Shearwater Research Elastic Strap Kit is a genuine Shearwater accessory designed to replace old, worn or damaged straps on your Perdix or Petrel...
$20.00
Shearwater Research
Shearwater Research PET Screen Protector Assembly Kit for Teric
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research PET Screen Protector Assembly Kit for Teric

The Shearwater Research PET Screen Protector for the Teric watch sized dive computer is longer lasting. Assembly kit includes: 2 x PET Screen...
$20.00
Shearwater Research
Shearwater Research Screen Protector Film-Perdix 2/Petrel 3
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Screen Protector Film-Perdix 2/Petrel 3

This peel and stick clear display protection film is die cut to fit only the Shearwater Perdix model dive computer. This is the genuine OEM...
$8.00
Shearwater Research
Shearwater Research Screen Protector Film for Petrel
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Screen Protector Film for Petrel

This model film protector has now been superceeded by Shearwater and has been replaced with a new screen protector  which can be found Here....
$8.90
Shearwater Research
Shearwater Research Screen Protector Film for Peregrine
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research Screen Protector Film for Peregrine

This peel and stick clear display protection film is die-cut to fit only the Shearwater Peregrine model dive computer. It does NOT fit other...
$10.00
Shearwater Research
Shearwater Research REPLACEMENT Battery Cap - Radial Style
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research REPLACEMENT Battery Cap - Radial Style

This is a Shearwater Research Radial Battery Compartment Cap for Shearwater Petrel 2 and NERD dive computers with blue O-ring. Effective Spring 2016,...
$50.00
Shearwater Research
Shearwater Research REPLACEMENT Socket Cap - Fischer
Category Path: Scuba and Watersports > Scuba Diving Technical > Tech Computers and Accessories > Tech Computer Accessories > Shearwater Accessories

Shearwater Research REPLACEMENT Socket Cap - Fischer

The Shearwater Research Fischer Socket Cap is a genuine replacement socket cap for Shearwater Research dive computers. Covers the Fischer 103A socket...
$40.00

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