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Shearwater Perdix Dive Computer

Shearwater Perdix Dive Computer
Shearwater Perdix Dive Computer Shearwater Perdix Dive Computer Shearwater Perdix Dive Computer Box Shearwater Perdix Contents

The Shearwater Perdix dive computer - Powerful, simple, reliable and smaller. A multi gas dive computer for Air, Nitrox, Trimix, Oopen Circuit, Closed Circuit Rebreather diving with HR display, slim design, extended battery life. The Shearwater Perdix is one of the most popular and reliable dive computers on the market. In stock - Dispatched in 1 day.

SKU 13007
Add Extra SAFT 3.7 battery
Add VPM-B Upgrade* PIN

The Shearwater Perdix dive computer - Powerful, simple, reliable and smaller. A multi gas dive computer for Air, Nitrox, Trimix, Oopen Circuit, Closed Circuit Rebreather diving with HR display, slim design, extended battery life. The Shearwater Perdix is one of the most popular and reliable dive computers on the market. Merging state of the art manufacturing techniques, innovative engineered materials, and consumer feedback, Shearwater research has successfully developed the low-profile, sleekly contoured design of this computer without sacrificing features vital to technical divers.



Underwater Explorers Ltd. (DirDirect) is an authorised Shearwater dealer based in the UK with world-wide delivery. Shearwater Research designs and manufactures computers for divers demanding more from themselves and their diving experience.  Whether you're an air, nitrox, multi gas trimix  or closed circuit rebreather diver, Shearwater Research offers products which are powerful, simple and reliable. The Perdix is both Open Circuit and Closed Circuit trimix enabled straight out of the box and is the current favourite among technical divers.

Similar to the past generation Petrel 2, the Shearwater Perdix multi gas computer  is both Open Circuit and Closed Circuit rebreather enabled straight out of the box. It's 30% extended battery time is complemented by the new slimline case, a stunning 2.2" full colour HD display with a renown Shearwater simple two button operation, a 3 axis tilt compensated digital compass and an integrated bungee mount.  With 5 programmable gases in each OC/CC mode, fixed PO2 and two button BO on closed circuit, colour coded warnings, simple to use adaptive menus, user replaceable battery, the Shearwater Perdix comes with multiple decompression algorithms - Bühlmann ZHL-16C with Gradient Factors - and user adjustable conservatism. Optional VPM-B pin is available both on purchase or afterwards. Looking for the Perdix Air Integrated? Click Perdix AI.

Multiple Dive Modes

  • Open Circuit Tec (Trimix)    
  • Open Circuit Rec (Air and Nitrox)    
  • Closed Circuit - Fixed PPO2   
  • Gauge (Bottom Timer)
  • 5 Gases Each Mode (Air, Nitrox, Trimix)

Shearwater Perdix Dive Computer


  • Contoured Low Profile Technical Dive Computer
  • 2.2” Full Colour HD Display
  • OC, CC Fixed Po2, Trimix enabled
  • Bühlmann ZHL-16C with Gradient Factors - User Adjustable Conservatism
  • Optional VPM-B
  • Open Circuit, 5 Gases
  • Closed Circuit, 5 Gases,
  • 2 Button Push Quick OC Bailout
  • 3 axis, tilt compensated, digital compass
  • Gauge Mode
  • Simple Yet Advanced User Interface
  • User Customisable Display
  • Colour Coded Warnings
  • Simple to Use Adaptive Menus
  • Automatic Screen Brightness
  • Customizable Flip Screen
  • Metric and Imperial
  • Multiple Languages (English, French, Simplified Chinese, Traditional Chinese, Korean & Japanese)
  • Dive Log Downloads via Bluetooth
  • User replacable single AA Battery
  • Perdix does not support external PO2 Monitoring (Check Petrel 2 - EXT)

Package includes:

  • Computer
  • Hard carry case
  • Preinstalled screensaver
  • Straps
  • AA battery (Please note optional SAFT battery also available - read underneath)



Shearwater Perdix Dive Computer


Optional VMP-B Upgrade

The Perdix comes with Bühlmann ZHL-16C algorithm with Gradient Factors installed but you can upgrade it to VPM-B with a special PIN, giving you the option of using the standard GF deco or switching to VPM-B. Once you select this option we will organised to the unlock code for your specific model and serial number. You will then need to update your firmware to the latest firmware before using the PIN code.

VPM or the Varying Permeability Model is a decompression algorithm that attempts to model the behavior of bubbles within the human body during decompression. The algorithm was initially developed by David Yount in laboratory testing and coded into Fortran by Erik Baker.

Shearwater Research has implemented VPM-B according to the original Erik Baker Fortran specification. In addition to implementing the Baker model, Shearwater Research has added a new option. VPM-B dive profiles often have deep stops to control bubble formation with reduced time at shallow depths. The reduced shallow depth time can be quite aggressive with VPM-B so Shearwater Research has included a VPM-B Gradient Factor Surfacing (GFS) option. VPM-B/GFS allows VPM-B dives to be executed while ensuring that a gradient factor of 90% is never violated.


Shearwater Perdix Dive Computer

Battery Information:
Life (1.5V Alkaline) Brightness Modes:

  • Cave 100 Hours
  • Low 76 Hours
  • Medium 50 Hours
  • High 36 Hours

Life (Saft LS14500 3.6V Lithium) Brightness Modes

  • Cave 230 Hours
  • Low 200 Hours
  • Medium 130 Hours
  • High 100 Hours

Display Information:

  • 2.2", QVGA, Full Colour LCD
  • Always on LED backlight
  • 35% NTSC Colour Range


  • Surface - 152g (0.34 lbs) includes AA alkaline battery
  • In-Water - 42 g (0.09 lbs) includes AA alkaline battery

Wrist Attachment:

  • 2 x 3/4" elastic straps with locking buckles

Download the Shearwater Perdix Sell Sheet

Shearwater Perdix Dive Computer


How does the Perdix compare to the Petrel 2? Why do divers even buy the Petrel 2 instead of the Perdix?

The Shearwater Perdix has all the reliable functionality of the Petrel in a slimmer, lighter profile with longer run times on any given battery. The Perdix screen 2.2" isn't that small compared to the Petrel's 2.4" screen but some divers will continue to prefer the larger screen, higher profile and more traditional 'bulkier' housing with a rugged, strong feel (the Petrel). Petrel EXT version also allows rebreather PP02 monitoring. You can compare the Perdix and the Petrel computers by taking a look at this 2-page PDF Comparison Sheet.

If I decide to get a Petrel 2 instead, is Shearwater Research going to continue to release firmware upgrades for the Petrel 2?

Yes.  The original Petrel and Petrel 2 have the same firmware versions, and updates for either will continue to be posted in Shearwater's firmware downloads section.

What type of batteries can I use and what maintenance does it need?

This and other questions are answered directly by Shearwater Research in the online FAQ. Please click on Shearwater Online FAQ and select the Perdix from the top menu. You can also download the current Perdix AI Manual. Feel free to contact us any day, we are open every day.

While almost any kind of AA sized battery works with your Shearwater Perdix AI, the standard 1.5V alkaline battery (the type found in stores around the world) works best.

Shearwater Perdix Batteries

There are numerous types of AA sized batteries that will work in your Shearwater Perdix, read below for more details:

Shearwater recommends the AA 1.5V alkaline battery (e.g. the Duracell Coppertop) because it is:

  • Inexpensive
  • Available anywhere
  • Reliable
  • DGives about 45 hours of diving
  • As an added bonus your Perdix provides a useful “Fuel Gauge” display for these batteries.

LEAKAGE WARNING: Alkaline batteries are prone to leaking, especially when completely discharged. Do not store with a discharged alkaline battery installed.

The Saft 3.6V LS14500 battery (used by the Shearwater Predator) is also a good choice, primarily because it has the longest usable life (130 hours on medium brightness). However they are:

  • Expensive
  • Hard to find
  • Sensitive to temperature and storage conditions

In addition they are incompatible with the new “Fuel Gauge” feature so only three levels are given: Full, Low (Yellow) and Critical (Red).

Li-Ion - Rechargeable
The 3.7V Li-Ion 14500 battery is a good choice that can be purchased online. The AW brand is recommended and typically high quality. The brands Trustfire and Ultrafire can be good, but seem to come from a wider variety of sources and many users report getting duds. The Li-Ion batteries give about 40 hours per charge and are compatible with the new “Fuel Gauge” feature. Note that these batteries are actually about 4.2V when fully charged.

NiMH - Rechargeable
The 1.2V NiMH battery can also be used. These are commonly used in photo flashes and digital cameras, and can be purchased in most electronics stores. About 35 hours per charge can be expected. We recommend using the low self-discharge models typically labeled as “pre-charged”, “ready charged”, “stay charged” etc. and have capacities around 2000mAh. The older style high self-discharge batteries have higher capacities (around 2800mAh) but are not recommended. They will work, but will go dead in a few weeks just sitting on the shelf. Also, all NiMH batteries are incompatible with the new “Fuel Gauge” feature so only three levels are given: Full, Low (Yellow) and Critical (Red). If you have these batteries already from your photo flash, feel free to use them. However we do not recommend buying them for the Perdix as better choices are available.

Photo Lithium 1.5V
These are the best choice for cold water divers. Sold as the Energizer brand Advanced Lithium and Ultimate Lithium batteries. The 1.5V Photo Lithium batteries offer almost double the run time in a Perdix when compared to an alkaline battery. However they can cost about 4X as much as an Alkaline. They are a good choice if you want longer run time than alkaline batteries provide or if diving in waters colder than 8 degrees Celsius (46 degrees Fahrenheit) . They can be found in most department stores or electronics stores and also in many drug stores.

Zinc-Carbon 1.5V
1.5V Zinc-Carbon batteries are el-cheapo batteries commonly found in dollar stores. Although they work, they only provide about 10 to 15 hours and so are not recommended. However if they are all you can get on a tropical island somewhere, feel free to use them. Set the Perdix battery type to “1.5V Alkaline” when using zinc-carbon batteries.

[The above explanation has been taken from Shearwater's FQ https://www.shearwater.com/shearwater-product-faq/what-type-of-batteries-can-i-use-in-the-perdix/]

Shearwater Perdix Screenshots and Videos

Shearwater Perdix Dive Computer

Watch all Shearwater Videos on the Shearwater Youtube Channel
Want to know more about Shearwater computers? Check out this Interview with Bruce Partridge , founder of Shearwater Research in Canada

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