FAQ ABOUT DIVE COMPUTERS

Products - Computers

FAQ ABOUT DIVE COMPUTERS

The Garmin Descent Mk2 builds on the features of their popular fēnix® 6X multi-activity smartwatch to add SCUBA diving functionality in addition to the many non-diving related features. The MK2i model adds support for hoseless gas pressure integration, sometimes called air integration (AI), with separately purchased optional Descent T1 wireless pressure transmitters. Based on the fēnix® 6s, the Mk2s is a physically smaller version of the Mk2. For more details see our TekTip Descent Model Differences

Currently, only the Descent MK2i with SubWave model supports hoseless gas pressure integration, sometimes called air integration (AI), with a separately purchased optional Descent T1 wireless transmitter. The Garmin Descent models without the "i" in the model name do not include the technology necessary to support monitoring gas cylinder pressure.

The Garmin dive computers sold by Dive Gear Express support English by default and include a language pack that also supports: Български (Bulgaria), Čeština (Czech), Dansk (Danish), Deutsch (German), Eesti (Estonian), Eλληνικά (Greek), Español (Spanish), Français (French), Hrvatski (Croatian), Italiano (Italian), Latviešu (Latvian), Lietuvių (Lithuanian), Magyar(Hungarian), Nederlands (Netherlands), Norsk (Norwegian), Polski (Polish), Português (Portuguese), Русский (Russian - East Slavic), Română (Romanian), Slovenčina (West Slavic), Slovenščina (South Slavic), Suomi (Finnish), Svenska (Swedish), Türkçe (Turkish), and Yĸpaïaϲbĸa (Ukrainian).

All Garmin watches always support English, but have two different firmware versions that in turn each supports a specific language pack software download. The firmware version of the watch depends on the country of the authorized retailer: Asian Pacific (APAC) that supports the CJK ideographic character sets OR Rest of the World (RoW). The firmware between the APAC and RoW versions is different, so changing the language is not just a matter of downloading a different language pack. The Descent models sold by Dive Gear Express are the RoW version, not the APAC version, and do not support Chinese, Japanese or Korean languages.

The Perdix AI is a richly featured technical diving computer and the Peregrine is an extended range sport diving computer. They have identical color display screens with very similar core feature sets and operation.

The Perdix AI is a best-in-class technical dive computer that includes support for Trimix, VPM alternative deco algorithm, wireless air integration, an electronic compass and rebreathers.The Peregrine can best be thought of as a value engineered Shearwater dive computer appropriate for Air and Nitrox divers that supports multi-gas planned decompression diving, yet without compromising on quality or ease-of-use.

Compared to the very deep rating of the Perdix design, the Peregrine low profile case design is appropriate for the depth limits of Air and Nitrox divers thus allowing significant cost reduction. Omitting the wireless air integration radio receiver and the electronic compass generates further savings. No need to support mixed gas and closed-circuit also allows for simplified software. The Perdix is powered with any AA size battery and the battery is user changeable; the Peregrine is powered with an internal rechargeable Li-ion 900mAh battery.

No, the Shearwater Research Peregrine dive computer does not have the internal hardware for support of RF transmitters to display the cylinder gas pressure, commonly called wireless air integration (AI). Shearwater tells us they have no plans to add AI to the Peregrine.

Frankly, the Peregrine is a value engineered computer for which the AI feature does not make much sense in that price range because a single transmitter costs almost as much as the computer itself. If the AI feature is a requirement for your diving, we suggest you consider either the Perdix AI or the Teric.

All Shearwater air integrated dive computer models are compatible with both the SWIFT transmitter and what Shearwater now calls their "legacy" transmitter. Both transmitters are also compatible with each other.

In 2021, Shearwater Research introduced a next generation tank-pressure wireless transmitter named the SWIFT that replaces their previous legacy transmitter that was originally manufactured by Pelagic Pressure Systems (PPS). PPS has been supplying their transmitter, made in Taiwan, to various dive computer manufacturers such as Aeris, Aqualung, Hollis, Oceanic, Sherwood, Shearwater and Tusa for many years. The good news is Shearwater tells us that any transmitter marked on the body with "FCC ID MH-8A" (the registration number of the PPS transmitter), regardless of the brand, will work with their Perdix AI, Teric and NERD 2 model air integrated dive computers. However, multiple PPS transmitters tend to interfere with the signals from each other and we recommend using the PPS transmitter only in single tank applications.

While both transmitters are compatible, the Shearwater SWIFT has many improvements over the legacy PPS transmitter:

  • The Swift active interference avoidance system allows many more transmitters to work side-by-side without signal interference.
  • The Swift indicator LED provides quick diagnostic information.
  • The Swift is smaller than legacy Shearwater transmitters.
  • The Swift has a robust metal base that allows for hand installation without the need for special tools or wrenches.
  • The Swift’s double O-ring design reduces the chance of a flood after a battery change.
  • The Swift is unlikely to be mistaken for a tank valve knob.
  • The Swift was designed and built in British Columbia, Canada.

For answers to questions about the SWIFT, as well as compatibility with the legacy transmitter, visit their Swift Support FAQ.

The Shearwater dive computers sold by Dive Gear Express support English by default and also include language support for: Chinese-Simplified, Chinese-Traditional, French, German, Italian, Japanese, Polish, Portuguese, and Spanish.

The short answer is you do NOT need the VPM or DCIEM upgrade. These are additional decompression models available on some Shearwater dive computers as an optional alternative to the default Bühlmann GF gas content model used by all Shearwater dive computers (and most other dive computers) to compute no-decompression limits and decompression schedules for dives. For recreational diving, there is no expert consensus that VPM or DCIEM is better than Bühlmann, and some recent studies suggest VPM may be worse. If you don't understand the differences and why you would choose one or the other, Dive Gear Express and Shearwater recommends sticking with the factory default of Bühlmann 30/70.

There are a variety of aftermarket silicone covers and metal bull-bars for dive computers that are available on Amazon, eBay, Etsy, and even at some dive retailers. Although these aftermarket accessories may enhance the cosmetic appearance of the device, in our experience they do not provide any significant additional protection. Dive computer manufacturers may not warrant their devices when used with the untested aftermarket covers as they have been known to obstruct, obscure or even damage the computer functions. There are also aftermarket 3D printed mounts for dive computers, again untested with the possibility of causing malfunction or even the loss of a device.

We have consulted with the manufacturers of the dive computers we sell and learned they express disdain for these aftermarket products. Our dive computer manufacturers tell us that they have delivered the best possible product and appropriate accessories after extensive research and development. The fact is, the addition of these aftermarket products cause more problems than any dubious benefits they may provide. Thus Dive Gear Express, as a respected major retailer for all the dive computers we carry, does not recommend or sell unapproved aftermarket dive computer accessories for this critical piece of life support equipment.