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When this happens underwater it will leave the diver without any decompression information at the time when it is most needed. Other computers, for example Delta P's VR3, will continue to function, providing 'best guess' functionality whilst warning the diver that a stop has been missed, or stop ceiling violated.
Some dive computers are able to calculate decompression schedules for breathing gases other than air, such as nitrox , pure oxygen , trimix or heliox. The more basic nitrox dive computers only support one or two gas mixes for each dive. Others support many different mixes. Most dive computers calculate decompression for 'open circuit' scuba where the proportions of the breathing gases are constant: Other dive computers are designed to model the gases in some 'closed circuit' scuba rebreathers , which maintain constant partial pressures of gases by varying the proportions of gases in the mixture: There are also dive computers which monitor oxygen partial pressure in real time in combination with a user nominated diluent mixture to provide a constantly updated mix analysis which is then used in the decompression algorithm to provide decompression information.
The Office of Naval Research funded a project with the Scripps Institute of Oceanography for the theoretical design of a prototype decompression analog computer. Had this error not occurred, the U. Navy Tables might never have been developed, and divers might have been using instrumentation to control their dives from on. The decompression meter was distributed directly by SOS and also by scuba diving equipment firms such as Scubapro and Cressi. It was very simple in principle: The chamber pressure was measured by a bourdon tube , calibrated to indicate decompression status.
The device functioned so poorly that it was eventually nicknamed "bendomatic". In , Stubbs and Kidd applied their decompression model to a pneumatic analogue decompression computer. Several analogue decompression meters were subsequently made, some with several bladders for illustrating the effect on various body tissues, but they were sidelined with the arrival on the scene of electronic computers.
Dive computer - Wikipedia
In ,  the Hans Hass - DecoBrain , designed by Divetronic AG a Swiss start-up, became the first decompression diving computer, capable of displaying the information that today's diving computers do. The DecoBrain was based on A. A drawback was that if the diver was faced by a ceiling, he did not know how long he would have to decompress.
The EDGE's large, unique display, however, featuring 12 tissue bars permitted an experienced user to make a reasonable estimate of his or her decompression obligation. Orca Industries continued to refine their technology with the release of the Skinny-dipper in to do calculations for repetitive diving. Even by the late s, the advent of dive computers had not met with what might be considered widespread acceptance. Combined with the general mistrust, at the time, of taking a piece of electronics that your life might depend upon underwater, there were also objections expressed ranging from dive resorts felt that the increased bottom time would upset their boat and meal schedules, to that knowledgeable divers felt that the increased bottom time would, regardless of the claims, result in many more cases of Decompression sickness.
The basic issue was made clear by Andrew A. Pilmanis in his introductory remarks: From this perspective, this workshop can begin the process of establishing standard evaluation procedures for assuring safe and effective utilization of dive computers in scientific diving. After meeting for two days the conferees were still in, "the early stages of development," and the "process of establishing standard evaluation procedures for assuring safe and effective utilization of dive computers in scientific diving," had not really begun.
Over the course of several hours the suggestion prepared by Sharkey and Heinmiller was edited and turned into the following 13 recommendations:. As recorded in "Session 9: General discussion and concluding remarks: These 13 points had been thoroughly discussed and compiled the night before, so that most of the additional comments were for clarification and precision. The following items are the guidelines for use of dive computers for the scientific diving community.
It was again reinforced that almost all of these guidelines were also applicable to the diving community at large. The remarkable thing about this process is that after the AAUS workshop the opposition to dive computers crumbled, numerous new models were introduced, the technology dramatically improved and dive computers became, virtually overnight, the standard pieces of diving equipment that they are today. This dive computer, based on the RGBM model, includes an underwater communication system that enables divers to transmit text messages, also featuring SOS and homing capabilities, and digital 3D compass.
The risk of the decompression algorithms programmed into dive computers may be assessed in several ways, including tests on human subjects, monitored pilot programs, comparison to dive profiles with known decompression sickness risk, and comparison to risk models. Studies at the University of Southern California Catalina Hyperbaric Chamber ran dive computers against a group of dive profiles that have been tested with human subjects, or have a large number of operational dives on record.
The dive computers were immersed in water inside the chamber and the profiles were run. Remaining no-decompression times, or required total decompression times, were recorded from each computer 1 min prior to departure from each depth in the profile. Evaluation of decompression algorithms could be done without the need for tests on human subjects by establishing a set of previously tested dive profiles with a known risk of decompression sickness. This could provide a rudimentary baseline for dive computer comparisons. If the decompression algorithm used in a series of dive computers is considered to be acceptable for commercial diving operations, with or without additional usage guidelines, then there are operational issues that need to be considered: From Wikipedia, the free encyclopedia.
Instrument to record dive profile and calculate decompression obligations in real time. Hydrospace Explorer Trimix and rebreather dive computer. International Journal of the Society for Underwater Technology. Society for Underwater Technology. Retrieved 7 March American Society for Clinical Pathology Teleconference. Norwegian University of Science and Technology. Undersea and Hyperbaric Medical Society: A Review of 83 Cases".
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Proceedings of Advanced Scientific Diving Workshop. Smithsonian Institution, Washington, DC. The SOS decompression meter". Diving and Hyperbaric Medicine. Canadian Institute of Aviation Medicine Report. Advances in Underwater Science Proceedings of the American Academy of Underwater Sciences Eighth annual scientific diving symposium.
American Academy of Underwater Sciences. Impact on the diving community". Undersea and Hyperbaric Medicine. Navy Decompression Computer Article by Capt. Diving Science and Technology Corp. Operational Variability in 49 Models of Diving Computer". Steller D, Lobel L, eds. Diving for Science Freediving Saturation diving Scuba diving Snorkeling Surface-supplied diving Atmospheric pressure diving Unmanned diving. Clearance diver Commercial offshore diving Diver training Frogman Hazmat diving Military diving units Police diving Professional diving Public safety diving Recreational diving Scientific diving Underwater archaeology Underwater photography Underwater videography.
Barotrauma Civil liability in recreational diving Decompression sickness Drowning Freediving blackout Dysbaric osteonecrosis High-pressure nervous syndrome Human factors in diving safety Hypercapnia Hypothermia Hypoxia medical Investigation of diving accidents Isobaric counterdiffusion Latent hypoxia List of diving hazards and precautions List of legislation regulating underwater diving List of signs and symptoms of diving disorders Nitrogen narcosis Oxygen toxicity Scuba diving fatalities Seasickness Silt out Task loading.
I wanted something simple and easy to read. The Zoop does the job very well. The only problem I had was learning to use the computer to access my dives, but once I got the system down it was easy. I picked up this dive computer to give to students and dive tourists. For my students it is easier to keep track of their dive times, ascent rates, and helps them understand how their time effects how long they can stay underwater with multi-level diving. The ability to reset the computer was the deciding factor to buy this for my classes.
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The oversized case is a little annoying, but not terrible. Pro's and Con's of the Cressi Leonardo dive computer: The price is good and it's a dive computer that will fit you at entry level but still work once you get more advanced. It's really easy to understand, and use on any recreational dive. Pro's and Con's of the Suunto Vyper dive computer: The only down sides are that it is not comfortable for her to wear during surface intervals, and the lack of integrated air means she has to monitor two separate gauges.
Pro's and Con's of the Suunto Zoop Novo dive computer: This is a simple and easy to use computer. You get good value of money, a realiable computer, that is perfect for a brand new diver, but will meet your needs for many dives. Pro's and Con's of the Aqualung i dive computer: For a multi-sport diver, scuba and free diver, this watch works very well in all situations.
Pro's and Con's of the Suunto D4i Novo dive computer: The menus are a little confusing, but they are easier enough to learn and navigate. Overall this is a great dive computer watch for any diver. Pro's and Con's of the Oceanic Geo 2. The screen has its drawbacks, but they are easy to overcome. The computer is light and comfortable. The battery only lasts about hours but is rechargeable and easy to hook up with the magnetic charger.
Pro's and Con's of the Cosmiq Plus dive computer: I have been diving with Suunto computer more than a decade, and upgraded to the D4i to get rid of an additional hose when diving in cold water with a dry suit. The D4i feels more like a watch than a dive computer, which is nice, because I can comfortably keep it on my wrist during surface intervals.
I love the free dive mode, as it helps me in my free dive depth and bottom time training. I love the simple interface of the Puck Pro. Sure it made be a little big, but that translates to being easy to read in almost any situation. I dive as often as I can, and the battery definitely gets a work out. So, the user changeable battery is an amazing feature.
Pro's and Con's of the Mares Puck Pro dive computer: I really enjoy the Oceanic VTX. The led display and Bluetooth integration make this computer feel futuristic and high class. The menus and setting are very easy to learn and modify, and the bright screen is very clear while diving. The only downside is that the screen dims automatically making it harder to read, and in bright sunlight the display gets a little washed out.
There is something to be said about a dive computer that is as beautiful out of the water as it is in the water. Plus, the D6i has all the features I need for my recreational diving. The display is still easy to read and manipulate even though it is watch sized. Pro's and Con's of the Suunto D6i dive computer: The Icon HD was a great purchase for many divers.
While the computer is big, and not easy to carry around on the surface, it is perfect when underwater. The display is the easiest to read that I have dived with. The color coded tank pressure lets me know at a glance where I am on available air. Perfect for the diver who wants it all. The Matrix is almost the perfect size for a watch dive computer, and the weight is great.
Diving with the Matrix is as easy and it's very reliable. The digital compass is fool proof. The only down side is that I still have to have an analog pressure gauge. Pro's and Con's of the Mares Matrix dive computer: All I need to say about this computer is wow. I love that it is comfortable on either wrist which allows me more flexibility with the tools I take with while working underwater. The abundant information available makes me feel safe and more at ease on my deeper and gas-mix dives.
Pro's and Con's of the Shearwater Perdix dive computer: The EON steel is everything a diver could possibly want in a dive computer. The large color display is easy to read and decipher the different information for the diver. I loved that I can custom the data I see. The price is high, but is worth paying for. I have never felt better protected when diving with a computer, and the durable construction dissolves fears of dropping or damage from falling tanks. Pro's and Con's of the Suunto Eon Steel dive computer: Two huge features stood out to me when I picked up the Petrel.
I use this computer for work and play, but being able to record every dive makes sure I am covered and backed up if there are ever any questions or issues with work. Diving with the computer is beautiful and easy. The large and bright screen never leaves me guessing on my air or dc times. I was quite happy to plan with my dive tables and logbook and spend the money on more dive trips. When I started working and diving every day , sometimes times, my computer became one of my favorite things. It is a lot easier to look at my wrist to get information about my depth and bottom time than to have to bend down and check my gauges all the time.
Having mine on my wrist means I tend to look at it a lot more often too. Another win for streamlining! Checking information on the wrist is easier than to bend down on a guage console - Credit: Tables assume that you go straight down and stay at that level or series of levels for the time you planned exactly.
But what if you spend a lot of time looking at a turtle at 18 metres 60fsw and spend half the time at 24 meters 80fsw? It seems like a small thing but your computer will tell you how much more or less bottom time you will get and change your dive plan as you go.
Your computer does not simply let you know the bottom remaining time for the current dive. It will also let you calculate your surface interval and plan your next dives. A table does this great when doing only a few dives, but when you are doing a lot of repetitive diving every day you have to remember you still might have nitrogen in your body the next morning.
Some will even connect to your computer, automatically filling in an e-logbook and giving you detailed graphs and statistics. There are various alarms that you can set on some computers to let you know when stuff happens. I never want to hear the 5 minutes of bottom time remaining alarm, but it has been helpful sometimes when I was distracted. I use my safety stop one a lot, which I have set to let me know when I get to 5 meters 16fsw and then counts down 3 minutes.
I also find the rate of ascent alarm useful, which lets me know when I am going up too quickly. Not all watches work very well when regularly exposed to pressure at depth and not all computers can be worn around town. Is it useful to you having one device that does both? Some computers wirelessly connect to a transmitter in your first stage and can give you information about remaining air pressure. They will also tell you how quickly you are consuming your air and will calculate how much time it will take you at your current depth before you use it up. Another great feature available on some computers is keeping track of different gas blends and oxygen exposure when diving with enriched air and Nitrox.
Some will even manage multiple blends and allow you to switch between them during a dive. Some computers have an electronic compass. They are supposed to be a little less sensitive to having to be perfectly level and can remember headings for you. I have heard mixed opinions about how useful and accurate they are. Some computers have built in GPS allowing you to tag a specific coordinate to navigate towards — such as your dive boat. Does your computer have to be sent in to a dealer to have the battery changed? These computers will cost you a bit more in the long term as you will have to pay each time.
Computers come in all sorts of shapes and sizes, have different features and big cost differences. In some parts of the world they can be a status symbol like the sexy Suunto titanium range and in other places they almost never see them. I always read reviews and talk to people about their equipment before buying anything.
Think about whether looks are important, what features you need, how often you will use it and how much you want to spend. Remember that your computer is only accurate about your own dive. Your buddy might go a little deeper or enter the water sooner than you. Always use the most conservative computer and have a backup plan just in case. Which Dive Computer do you use? Do you have any personal advice to share with others?
Leave a comment below! A few months after I started diving regularly I bought the Galileo Luna with air integration and I absolutely love it. Like you I love the ascent alarm and quick access to a 3 minute timer. The compass, however, I find to be too slow — I prefer a non-digital. I just bought a dive computer and will be using it for the first time next week in the Philippines.
Best entry level dive computer
I have used a dive computer while doing the dives for my certification. At the time, having the computer was re-assuring. After that I never used a computer and always felt a bit uncomfortable. Of course, I have used one before, and I would definitely want one. It helps a lot and makes your dive more stress-free.
But I do not see a rush in buying one. I still manage to cope without one, and will make thorough research before purchasing one. I believe that a dive computer must be the first you buy of dive equipment. It is critical to be able to dive safe and you have every opportunity to calmly log your dives with the correct information after the dive. Besides my mask and fins which I bought before I was certified the computer was my first, and it have saved my life. In a ripping downwards current the computer was a lifesaver.
I have learned to live with the changes that have made a C card a ticket for a resort dive. One of the things i do not disagree with is the dive computer. How can that diver be independent and responsible? Computers are ubiquitous and will help the new generation of divers stay involved. So I am for them. Still I was able to keep diving, once I got a holed of a dive table, and the holiday was saved. I understand what you are saying about a dive computer, I spend a lot of money on two Atomic Cobalts.
Too many just rely on an electronic piece of equipment, that may need a new battery at the wrong time or they forgot how to use it. It tells you where to turn, etc.
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Go ahead and watch what happens when it stops working during a trip…. And this is where training comes in. Know your consuls, check depth, air, and your surroundings as often as you can.