A dive computer is a wonderful and very useful piece of equipment to own. I would say right after mask, snorkel and fins your next purchase should be a dive computer or a wetsuit. Just as there are many different types of people there are many different styles dive gear for you to pick. And a dive computer can come in many different styles. And they are all nitrox compatible right out of the box. All dive computers track your nitrogen loading and your safety stop. Most water activate and have altitude adjustments.
The basic “puck” style of dive computer is first up. A very popular entry level option, it can be worn on your wrist or in a console attached to your first stage. The come in 2 basic styles, the one button or two buttons. Both are very easy to learn to use, but the one button does take a little bit extra to learn. When you reach the setting you want to change you need to hold the button down for a few seconds. It takes just a little to get use to it. The Aqualung i300 has come along and made the two buttons even easier to use. They labeled the buttons advance and select.
Next is the watch style or wrist dive computer. And of course with in this style there are 2 main types, air integration with a transmitter and non air integration. I have personally dived both and own both. For teaching classes I use the non air integration style. It gives me all the information that I need and I have an SPG for air pressure. For my dive travels I am even more stream lined by having all my dive info on my wrist and no console or hose.
Finally we have the air integration console style computers. Most of these have quick disconnects so you can take the computer off the hose for easy logging of your dive info. Most will have bigger screens for those of us that might be a little eye sight challenged.
With just about any dive computer, you can download your dive information into an e-log book. Some have blue tooth capability. With one dive computer you can upload 3d maps of the dive sights and some have color screens. Most now have user changeable batteries and one even has a heart rate monitor.
So which dive computer is right for you? Well that depends on you, but I can offer one suggestion. Take the time to visit with your local dive shop as they can show you your options and walk you through the differences for each style and in our case even a few different manufactures.