While a dive computer is by no means a required piece of SCUBA diving gear, it simplifies certain aspects of diving, allowing you to focus on the fun parts of diving. Since dive computers have gotten smaller, more feature-rich, and less expensive in the past 10 years, finding a diver without at least one dive computer is becoming increasingly rare.
Here are some features to look for when purchasing a new Dive computer:
- Air Integration: Some dive computers not only replace your depth gauge, they can also replace your tank pressure gauge. Typically adding advanced functionality such as calculations for remaining bottom time based on depth, tank pressure, and current breathing rate, air-integrated computers add a wealth of information to your dive. Some divers are concerned about reliability; however, if you continue to practice what you learned in training by checking your pressure every minute or two, even if a computer fails, you can still safely return to the surface. The only potential downside is an increase in cost.
- Integrated Compass: Even if you can replace your traditional gauges by upgrading to a dive computer (especially if it’s air-integrated), you’ll still need a compass. Some dive computers now include digital compasses so you can have all the benefits of big, clunky gauges in one compact package.
- Enriched Air: If you plan to dive with enriched air (nitrox, trimix, or pure O2), make sure you pick a computer that is either compatible or allows for gauge mode (based on depth gauge and bottom timer).
Style: The two most common styles are integrated into a console or wrist-mounted. Wrist mounting is better for streamlining, but because it requires a smaller package, it can increase the price.
- Decompression Model: This is a bit technical, but several scientific models determine how long a dive computer suggests you can stay underwater. Suunto’s RBGM (Reduced Bubble Gradient Model) is known to be one of the most conservative; others are less so, and a few will even let you select which model you want to use.
- PC Compatibility: Some dive computers have optional PC sync cables that allow you to download your dive data into your desktop or laptop to analyze your dives. These cables are usually optional accessories and are not included with most dive computers.
- Activation Mode: Most dive computers are wet-activated, which turns on when they hit the water. Sometimes, you’ll need to turn it on before getting in the water.
- Battery: Some dive computers must be sent in to the manufacturer to have the battery serviced, some can be replaced by the diver and some offer rechargeable batteries. Choose what will be most convenient for you based on your diving habits.
- Transmitters: If you choose to buy an air-integrated computer, you may have the option to track air pressure from more than one tank. Typically, extra transmitters aren’t included, so be sure to budget based on your needs.
- Backlight: Most dive computers have a backlight so you can see them during a night dive. If you frequently dive at night or in dim conditions, ensure your laptop features some form of illumination.
- Audible Alerts: Some computers allow you to set audible alerts for depth, bottom time or tank pressure. If you aren’t reliable when checking your computer, these audible alerts may save your life.
