Cindy, Dive Computer Guru — With 32 years of diving, I’ve seen the shift from dive tables to dive computers. As technology advances, the features and functions of dive computers evolve, making diving safer.

If you’re a new diver looking at getting yourself your very first dive computer, welcome! If you have a few hundred dives under your belt and are looking at updating your dive computer, welcome! While more advanced divers will likely already know what kind of computer they’re looking into getting, both novice and advanced divers will get some helpful tips for choosing a device that’s right for them. Let’s dive in, shall we?

Dear New Divers,

You may be asking yourself, why do I need a dive computer? The answer is fairly simple: for an easier and safer dive experience. Technically, with the use of dive tables that you learned in your scuba diving classes, you don’t need a computer, but just like calculators save you time and provide greater accuracy when it comes to long division, you’ll save valuable dive time by letting your computer do the thinking for you (and you won’t have to second guess your own calculations). Please note, you should still study your dive tables and get to know them since you never know when or if you’ll need to apply them, but computers make for a much more pleasant experience all together by safely increasing your bottom time. With some computers, even your dive logging experience is easier. Some dive computers let you connect right to your PC or smartphone to fill in your virtual logbook with the click of a button. But we’ll explore the details of that later.

You may also be asking yourself, what do dive computers do? Well, dive computers have the potential to do all kinds of things. The most important functions of a dive computer calculate your depth, elapsed dive time, and no decompression limit. The purpose of these functions is to let you know where you are in relation to the water’s surface and how slow your ascent will need to be to avoid that nasty decompression sickness (DCS). Each dive computer will have these core functions for your safety, but other additional features can vary depending on the computer.

So, what kind of dive computer should a new diver get? If you’re new to the world of diving and you start to shop around for a dive computer, the long lists of features and many different styles and even the tech terminology can seem rather overwhelming at first glance. The best advice we can offer when you’re about to drop some serious dollars on your first dive computer is—play around! Go to your local Divers Direct and ask about the selection of dive computers and each of their features and benefits. Do loads of online research if you can. Just get to know all you can about as many different computers as you can. That will help you feel out and analyze what might be the right computer for you. Additionally, as a beginner, it’s never a bad idea to start with a simpler, less expensive device. Using something simple to start off with will get you familiar with using a computer underwater. Also, you won’t have to worry about the potentially overwhelming aspect of trying to understand a dozen different features you may not even need as a new diver. With something simple, you’ll only need to learn the few necessary features the computer comes with so you can focus more on building your dive skill set and enjoying your dive rather than trying to navigate your way through a feature-packed computer.

One thing you should ask yourself when looking around at buying a dive computer is what kind of diver do I see myself becoming? That can possibly seem like an unanswerable question right now, especially if you only have a few dives in, but you may already have an idea about whether or not you’re hoping to advance to deep diving and other dangerous fun, or you may already be set on sticking with recreational diving. Basically, the answer to that question will let you know if you’ll only need a basic computer, or if you’ll want a computer that has room to grow while you do.

Dear Not-So-New Divers,

It’s possible that you’ve used the same dive computer you’ve had since you were a novice diver up to this point, or maybe you’ve had a few dive computers already and you’re looking for something that may be a better fit for your nautical needs. Either way, if it’s time for a new device, here are some questions you may want to ask yourself about your current computer: What feature or features do you feel may be lacking from your current computer? Do you wish it could do more? Like what? Do you feel the algorithm could be adjusted to better suit you? Think about the things that may make your dive experience even easier or more pleasurable. Dive computers have come a long way, and it’s not impossible to find something that not only meets your needs, but exceeds them as well.

Dive Computer Considerations for the Novice, the Advanced, and every Diver in between:

No matter if you’re shopping for your first dive computer or if you’re shopping for your fifth, there are a few things to consider when browsing around for new gear.

First of all, you need to get a general idea of what your budget is for this equipment. Dive computers have a wide range of prices averaging from around $150 to $1,500. That’s a huge jump and every kind of dive computer you can think of fills the space between. Keep in mind—less expensive doesn’t necessarily mean a poor product, and an extravagant price tag doesn’t always make something the best. The best product is the product that’s the best for you—simple as that. Once you’ve considered your budget, search within that range and try to find everything you need within that number. Don’t worry, whatever your budget is, you should still be able to find a suitable dive computer with a variety of features.

Air Integrated Console—Oceanic Pro Plus X

Something else to consider is whether or not you want your computer to be air integrated. An Air Integrated dive computer analyzes how much air or nitrox is left in your tank and adds the information to your computer’s screen like with the ScubaPro M2 Mantis and Suunto Eon Core wrist computers. This is obviously a desirable feature but can add on to the product’s price significantly.

Speaking of air, if you use or potentially plan to use Nitrox on your dives, it’s a good idea to have a dive computer that can switch between gases and has a range Nitrox capability. New Divers, just so you know, diving with Nitrox requires some additional training, but it can increase both the length of your dives and the safety. Most dive computers come with this capability, but it’s always a good idea to double check. 

Perhaps the most important aspect of your dive computer is its algorithm. This is the feature that is most concerned with your safety, tracking the amount of nitrogen you’re absorbing into your bloodstream while you’re down, and amazingly enough, there are multiple algorithms out there in the dive computing world. Some algorithms are more conservative than others which really just means they calculate a slower ascent with more/longer stops. Suunto computers are known to use highly conservative algorithms, and if you’re a less experienced diver, a more conservative algorithm is a good place to start to have the safest experience possible. Though, there are some brands like Aqua Lung that tend to use more liberal algorithms which allow for more bottom time but a faster ascent. Some computers that let you adjust the algorithm when you figure out your body’s ascending preferences and capabilities, and other computers can even self-adjust in response to your current biometrics.

Air Integrated Wrist—
ScubaPro G2 with Transmitter

Do you think you’ll be a once-a-year diver, or maybe at most get in two or three dives a year? Or will you be diving every opportunity you get, once, twice, five times a week logging more 100 dives a year? Your dive frequency is going to matter when it comes to your dive memory storage. If you’re only planning on diving when you go on that annual vacation to the Florida Keys or when you finally save up enough for that trip to Hawaii or Indonesia, you won’t be needing much log memory in your computer. This is because you’ll likely get home or to the hotel and transfer your dive info right then and there, waiting until next year or next vacation to do it all over again. But if you live near a rad dive spot (or many dive spots) and plan on making every possible dive you can, you may want more memory capacity for your computer so that you don’t have to upload your log info every single time you get out of the water.

If you envision yourself as a traveling scuba diver, you’ll be high in a plane, then down to the depths of the sea, then back high on a plane again. If you’re not careful, this could be dangerous. A really great feature for a dive computer to have for anyone who plans on taking their dives to new places is a no-fly time calculator. Once you get out of the water, you need to wait a certain amount of time before you can get on a plane and fly back home or to your next destination. Instead of dealing with the anxiety of hoping your own calculations are correct, the accuracy of a dive computer can certainly help you stay safer on your travels. So, get yourself a computer with this feature if you have an international dive location in mind already—you’re going to need it!

And finally, how would you like to mount your dive computer? You can access your information from a console/boot mount connected to your BCD, like with the Mares Mission Puck 2 Dive Computer; you can view it wirelessly on your wrist with something like the Suunto D5; or you can even have the information projected right onto your mask lens when using computer like the ScubaPro Galileo HUD. When thinking about your computer mounting, the most important factor to consider is how comfortable you are with the device. Does it seem too bulky? If you’re exploring a wrist computer, are the straps comfortable? What about the screen size? Sure, a smaller screen may mean greater comfort, but it could also mean more difficult readability. And beyond practicality, what about style? Do you want a computer that can venture with you on land and help your scuba skills when you’re not even in the water? The Garmin Descent Mk1 Computer is stylish enough for you to wear into the office after your morning dive, has a heart-rate monitor to keep up with your exertion while you dive and your endurance training on the surface. If you’re exploring a console computer, will you mind the extra equipment hanging from your BCD, or could you feel like you have too many techy tentacles floating around your tank? While a wrist mount is certainly the most popular mounting style since it’s wireless and you always know where to find it, will you mind the bulky bit of gear on your wrist? Again, comfort is key, and you’ll find your own mounting preference once you try them out.

Don’t Call It a Comeback—Analog Gauges

Analogue GaugeMares Mission 3

It’s easy to get caught up in what’s new in the infinitely evolving world of technology, but sometimes it’s a good idea to stick with tried and true methods, where all you need are your analog gauges, your mind, and your intuition to guide your way through your dive. Digital dive computers simplify the mental process by making a time table for you to follow, but if you’re the kind of person that relies on your mind more than you rely on technology, using analog gauges and your tables may be the most comfortable route for you—especially if you’ve been using this system for years of diving and it’s been working pretty well so far.

If you’re a new diver though and you start looking into analog gauges, you’ll immediately notice the simplicity in use and information. Where you may have looked at digital computers and thought, “What am I even reading right now?” When you read up on a specific analog gauge, it will likely be pretty straight forward. Additionally, you are your own algorithm here, so you’ll be trusting yourself to know the time table for ascent depending on the dive. Every analog console will at least tell you your tank pressure. If you do not want an air integrated digital dive computer, you’ll be getting one of these analog gauges regardless. But, to make your mind the computer here, you’ll need a depth gauge as well, and some consoles come with both. The only additional feature you’ll be able to add on to your analog console is a compass, which is seen here with the Mares Mission 3 Gauge Console. This analog console has everything you need to get your underwater brain going when calculating your bottom time and get your fins flipping in the right direction.

Suunto SK8 Wrist Dive Compass

Other Nifty Tools

Even if you don’t have analog gauges at your side and are perhaps using a digital wrist computer, you’ll still need a Dive Compass to help you navigate your adventure. Google Maps won’t help you find that shipwreck, but a good, old fashioned compass sure will. You can either attach it to your BC, string it on your wrist band, or even get a slate with a compass attached to the top if you prefer. There are a few options here, but again, the main thing to ask yourself regarding what compass to get is where you’ll feel it’s comfortably mounted and convenient to locate.

So, you’ve picked out your dive computer, or maybe you feel like you’re on the right track towards it anyway. What now? Well, ideally, everything you need will come in one package, but if you just dropped a thousand dollars on a wrist computer, you’re going to want to protect and preserve it. So, maybe you get yourself a screen protector for your new computer. You could also possibly need a tank transmitter for your air integration. Or maybe you like to stay ultra-prepared and want to keep an extra battery on you. Either way, there could be some Computer Accessories you’d like to add that could help you stay prepared and keep your gear protected. 

The Short of It

Basically, there’s no quick answer for the question, “What dive computer should I get?” Regardless if you’re brand new or if have been around the reef a few times, you’re going to have to do some work and research to find the right style of computer for you. But at least now you have a few key features to look out for and questions to ask yourself on your search for the right equipment. Remember, the whole purpose of a dive computer is for safety and convenience, so find something that’s comfortable for you to use, easy for you to read and understand, and has the key features you’re looking for.