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Cindy, Dive Computer Guru— With over 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.
A dive computer makes every scuba dive easier, safer, and more enjoyable. While you can technically rely on dive tables you learned in class, a dive computer does all the calculations for you, tracking depth, time, and decompression limits automatically. Think of it as a calculator for your dive: faster, more accurate, and stress-free. You should still understand dive tables in case you ever need them, but using a dive computer saves time, reduces error, and gives you peace of mind underwater. Many dive computers also make logging dives effortless. Some models connect to your phone or computer, allowing you to instantly upload your dive data and maintain a detailed digital logbook.
A dive computer’s main job is to monitor your depth, dive time, and no-decompression limit to help prevent decompression sickness (DCS). These core features keep you safe throughout your dive.
Depending on the model, dive computers can also:
Your safety comes first, but dive computers also make dives smoother, more efficient, and more enjoyable.
If you’re buying your first dive computer, the number of features and technical terms can feel overwhelming. Start simple—look for a reliable, easy-to-use model within your budget. Entry-level dive computers offer all the essential safety functions without unnecessary extras.
Before purchasing, visit your local Divers Direct to try out different models, ask questions, and get hands-on experience. A comfortable, straightforward computer will help you learn faster and focus on building your dive skills.
Think about your diving goals. If you plan to stick with recreational dives, a basic model is likely enough. But if you see yourself advancing to deep or technical diving, consider a dive computer that offers gas-switching, air integration, or customizable algorithms—features that can grow with you as your skills progress.
Here are a few key factors to keep in mind when choosing your next dive computer:
Budget: Dive computers range from around $150 to $1,500. More expensive doesn’t always mean better—focus on finding a model that fits your needs and comfort level.
Air Integration: Air-integrated dive computers display your remaining tank pressure and gas consumption directly on the screen, though this feature adds to the cost.
Nitrox Compatibility: If you plan to dive with Nitrox, make sure your computer can handle gas switching and varying oxygen percentages.
Algorithm Type: The computer’s algorithm determines your no-decompression limits and ascent profile. Some, like Suunto, are more conservative—great for newer divers.
Memory and Logging: Frequent divers may prefer a model with larger memory or wireless syncing. Casual vacation divers may not need as much storage.
No-Fly Time Feature: For traveling divers, this feature helps calculate safe surface intervals before flying.
Mounting Style: Choose between wrist-mounted, console, or heads-up display (HUD) options based on comfort and visibility.
Whichever you choose, comfort, readability, and ease of use are key.
While dive computers dominate today, some divers still prefer analog gauges. These provide simple readings for tank pressure and depth, often paired with a compass. If you like a hands-on, tech-free experience, analog systems still work well—just remember you’ll need to rely on dive tables and your own calculations.
Protect your investment with accessories like screen protectors, replacement batteries, and tank transmitters for air integration. A dive compass is another must-have tool for navigation—Google Maps won’t help you find that shipwreck!
There’s no one-size-fits-all answer to “What dive computer should I get?” Your ideal choice depends on your experience, budget, and diving goals.
The best dive computer is one that:
Do your research, try different models, and invest in a dive computer that helps you dive smarter, safer, and with more confidence.
What is a dive computer?
A dive computer is an electronic device used by scuba divers to measure and display various dive parameters in real time, such as depth, time, and no-decompression limits. It helps divers manage their dive profiles to avoid decompression sickness.
How does a dive computer work?
A dive computer uses sensors to monitor depth and time, applying decompression algorithms to calculate safe ascent profiles. It continuously updates information on no-decompression limits, ascent rates, and surface intervals to ensure safe diving practices.
What is no-decompression limit (NDL) on a dive computer?
The no-decompression limit (NDL) is the maximum time a diver can stay at a certain depth without needing to perform decompression stops during ascent. Dive computers calculate and display this limit in real time, helping divers avoid decompression sickness.
How do I care for and maintain my dive computer?
Rinse your dive computer with fresh water after each dive to remove salt and debris. Store it in a cool, dry place, avoid exposing it to extreme temperatures, and regularly check for firmware updates. Replace batteries as needed and have it serviced by a professional if required.
Can I use my dive computer for different types of diving?
Yes, most dive computers are versatile and can be used for recreational, technical, and freediving. Ensure your dive computer has the appropriate settings and features for the type of diving you plan to do, such as gas mix support for technical diving.