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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.


Shearwater Research Petrel 2 - RUN OUT SALE
Category Path: COMING SOON Brands-Manufacturers > Shearwater

Shearwater Research Petrel 2 - RUN OUT SALE

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

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Shearwater Research Petrel 2 OC/CC - Fischer - RUN OUT SALE
Category Path: COMING SOON Brands-Manufacturers > Shearwater

Shearwater Research Petrel 2 OC/CC - Fischer - RUN OUT SALE

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


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Shearwater Research Perdix 1 AI Dive Computer
Category Path: COMING SOON Brands-Manufacturers > Shearwater

Shearwater Research Perdix 1 AI Dive Computer

PRODUCT NOW SUPERCEDED TO PERDIX 2 TI SHEARWATER PERDIX 2 TI The Shearwater Research Perdix AI dive computer incorporates a powerful feature...
$1,499.00


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Shearwater Research Perdix 1 Dive Computer
Category Path: COMING SOON Brands-Manufacturers > Shearwater

Shearwater Research Perdix 1 Dive Computer

PRODUCT NOW SUPERCEDED TO PERDIX 2 TI SHEARWATER PERDIX 2 TI The Shearwater Research Perdix is a full decompression dive computer incorporating...
$1,430.00

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Shearwater Research Petrel 3 Computer
Category Path: COMING SOON Brands-Manufacturers > Shearwater

Shearwater Research Petrel 3 Computer

The Shearwater Research Petrel 3 OC/CC SA dive computer with Titanium bezel is a rugged and reliable technical dive computer with a whole range of...
$2,050.00
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Shearwater Research Petrel 3 OC/CC - Fischer
Category Path: COMING SOON Brands-Manufacturers > Shearwater

Shearwater Research Petrel 3 OC/CC - Fischer

The Shearwater Research Petrel 3 Fischer OC/CC EXT dive computer has all the modes and features of the Petrel 3, plus incorporates a Fischer 103 I/O...
$2,500.00
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Shearwater Research Petrel 3 OC/CC - Monitor AK (4-Pin)
Category Path: COMING SOON Brands-Manufacturers > Shearwater

Shearwater Research Petrel 3 OC/CC - Monitor AK (4-Pin)

The Shearwater Research Petrel 3 Fischer OC/CC Monitor AK (4-Pin) dive computer has all the modes and features of the Petrel 3, plus incorporates a...
$2,500.00
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Shearwater Research Perdix 2 TI Black Computer
Category Path: COMING SOON Brands-Manufacturers > Shearwater

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
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Shearwater Research Perdix 2 TI Dive Computer
Category Path: COMING SOON Brands-Manufacturers > Shearwater

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
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Shearwater Research Teric Watch Computer - BLACK
Category Path: COMING SOON Brands-Manufacturers > Shearwater

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
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Shearwater Research Teric Watch Computer - BLUE
Category Path: COMING SOON Brands-Manufacturers > Shearwater

Shearwater Research Teric Watch Computer - BLUE

The Shearwater Research Teric brings divers an everyday timepiece and dive computer of unprecedented capabilities. Different watch faces,...
$1,835.00
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Shearwater Research Teric Watch Computer - SILVER
Category Path: COMING SOON Brands-Manufacturers > Shearwater

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
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Shearwater Research Teric Watch Computer - BRONZE (Limited Ed.)
Category Path: COMING SOON Brands-Manufacturers > Shearwater

Shearwater Research Teric Watch Computer - BRONZE (Limited Ed.)

The Shearwater Research Teric - Bronze (Journeys Edition) brings divers an everyday timepiece and dive computer of unprecedented capabilities....
$1,835.00
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Shearwater Research NERD 2 Dive Computer - Stand Alone
Category Path: COMING SOON Brands-Manufacturers > Shearwater

Shearwater Research NERD 2 Dive Computer - Stand Alone

The Shearwater Research NERD 2 Stand Alone is a heads up (HUD) dive computer. The Near Eye Remote Display (NERD) incorporates a powerful feature set,...
$3,000.00
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Shearwater Research NERD 2 Dive Computer - Fischer
Category Path: COMING SOON Brands-Manufacturers > Shearwater

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
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Shearwater Research NERD 2 - DiveCAN Monitor (5-Pin)
Category Path: COMING SOON Brands-Manufacturers > Shearwater

Shearwater Research NERD 2 - DiveCAN Monitor (5-Pin)

The Shearwater Research NERD 2 DiveCAN is a heads up (HUD) dive computer. The Near Eye Remote Display (NERD) incorporates a powerful feature set,...
$3,400.00
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Shearwater Research NERD 2 - DiveCAN Monitor AK (4-Pin)
Category Path: COMING SOON Brands-Manufacturers > Shearwater

Shearwater Research NERD 2 - DiveCAN Monitor AK (4-Pin)

The Shearwater Research NERD 2 DiveCAN Monitor AK (4-Pin) is a heads up (HUD) dive computer. The Near Eye Remote Display (NERD) incorporates a...
$3,400.00
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Divesoft Freedom Advanced Bottom Timer
Category Path: COMPUTERS GAUGES and COMPASSES > Bottom Timers

Divesoft Freedom Advanced Bottom Timer

The Divesoft Freedom Advanced Bottom Timer has been specially developed in order to meet the needs of technical divers using ratio deco for...
$875.00
Sale: $805.00
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Divesoft Freedom CCR Bottom Timer
Category Path: COMPUTERS GAUGES and COMPASSES > Bottom Timers

Divesoft Freedom CCR Bottom Timer

The Divesoft Freedom CCR Bottom Timer (without Cable) has been specially developed in order to meet the needs of technical divers using ratio deco...
$1,399.00
Sale: $1,287.08
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Divesoft Freedom Nitrox Analyser Add-on
Category Path: SCUBA and WATERSPORTS > Scuba Diving TECHNICAL > Tech Computers and Accessories > Tech Computer Accessories > Divesoft Accessories

Divesoft Freedom Nitrox Analyser Add-on

The Divesoft Freedom Nitrox Analyser is an additional device for the Freedom computer for nitrox analysis (the measuring of oxygen concentration in...
$252.00
Sale: $231.84
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Garmin Descent G1 Solar Watch Dive Computer
Category Path: COMPUTERS GAUGES and COMPASSES > Dive Computers

Garmin Descent G1 Solar Watch Dive Computer

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
Sale: $1,011.08
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Garmin Descent G1 Watch Dive Computer
Category Path: COMPUTERS GAUGES and COMPASSES > Dive Computers

Garmin Descent G1 Watch Dive Computer

Descent G1 series of dive computers. Just like the brand’s previous Mk2 models, the G1s sport multi-type dive technology, a variety of health...
$949.00
Sale: $873.08
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Garmin Descent Mk1 Titanium Watch Dive Computer
Category Path: COMPUTERS GAUGES and COMPASSES > Dive Computers

Garmin Descent Mk1 Titanium Watch Dive Computer

This product has been discontinued, please see the new Garmin MK2 here .   Explore worlds of adventure, underwater or topside, with the Garmin...
$2,199.00
Sale: $2,023.08
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Garmin Descent Mk1 Watch Dive Computer
Category Path: COMPUTERS GAUGES and COMPASSES > Dive Computers

Garmin Descent Mk1 Watch Dive Computer

This product has been discontinued, please see the new Garmin MK2 here.   Explore worlds of adventure, underwater or topside, with the Garmin...
$1,999.00
Sale: $1,839.08
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Garmin Descent Mk2 Watch Dive Computer
Category Path: COMPUTERS GAUGES and COMPASSES > Dive Computers

Garmin Descent Mk2 Watch Dive Computer

The Garmin Descent Mk2 with Stainless Steel bezel is the watch-sized dive computer for you if you want a truly smart dive computer! Think high-end...
$2,149.00
Sale: $1,977.08
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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
Sale: $2,299.08
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Garmin Descent Mk2S Watch Dive Computer
Category Path: COMPUTERS GAUGES and COMPASSES > Dive Computers

Garmin Descent Mk2S Watch Dive Computer

Have you always gazed fondly at the Garmin Descent Mk2 dive computer, maybe even tried one on but thought it was just a bit big to use as an everyday...
$1,499.00
Sale: $1,379.08
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Mares Genius Dive Computer
Category Path: COMING SOON Brands-Manufacturers > Mares

Mares Genius Dive Computer

The Mares Genius Dive Computer is a colour screen dive computer made for any diver whether you dive air, nitrox EANx or Trimix. The large backlit...
$1,739.95
Sale: $1,513.76
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Suunto DX Watch Dive Computer - Sillver Elastomer Strap
Category Path: COMING SOON Brands-Manufacturers > Suunto

Suunto DX Watch Dive Computer - Sillver Elastomer Strap

The Suunto DX watch-sized dive computer with Silver Elastomer strap and USB cable, built on the award-winning Suunto D9tx platform, is the ultimate...
$1,000.00
Sale: $870.00
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Suunto EON Steel Black Wrist Dive Computer
Category Path: COMING SOON Brands-Manufacturers > Suunto

Suunto EON Steel Black Wrist Dive Computer

The Suunto EON Steel Black Wrist Computer is the new standard for advanced/technical diving. The long-anticipated EON Steel Black sets new standards...
$1,499.00
Sale: $1,304.13
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Suunto EON Steel Black Wrist Dive Computer with Tank POD
Category Path: COMING SOON Brands-Manufacturers > Suunto

Suunto EON Steel Black Wrist Dive Computer with Tank POD

The Suunto EON Steel Black Wrist Computer and Tank POD Multi Transmitter is the new standard for advanced/technical diving. The long-anticipated EON...
$2,048.00
Sale: $1,781.76
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Garmin Descent Mk3i Watch Dive Computer with Silicone Band
Category Path: COMING SOON Brands-Manufacturers > Garmin

Garmin Descent Mk3i Watch Dive Computer with Silicone Band

Order in item - not typically held in our Rye store. Please allow 3-4 days delivery KEY FEATURES Dive computer with a 1.2" AMOLED display,...
$2,899.00
Sale: $2,522.13
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Garmin Descent T2 Transmitter
Category Path: COMING SOON Brands-Manufacturers > Garmin

Garmin Descent T2 Transmitter

$899.00
Sale: $782.13
Save: (13%)

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