Dive Computers: A Guide for Reef Divers

Years ago, dive tables were the standard. At this point, most divers use a personal dive computer and for good reason.

Your computer tracks depth, time, ascent rate, and NDL in the moment. Tables give you a static plan. When you move between depths mid-dive, a computer adjusts. Tables don't.

Watch-style computers are the most common use these days. They're small enough, readable underwater, and you'll use them as a regular watch too. Console-mount computers are an option but not as many divers go that way now.

Budget computers start around a few hundred dollars and cover everything a recreational diver needs. You get depth, dive time, find more no-deco limits, a logbook, and often an entry-level freedive function. Stepping up to mid-range adds air integration, better readability, and more nitrox modes.

What new divers forget is algorithm differences. Certain algorithms are tighter than others. A cautious computer means less NDL. Looser ones give more time but at reduced safety margin. It's not right or wrong. It comes down to what you're comfortable with and experience level.

Ask people at a dive shop who dives with multiple brands before you decide. Staff will offer a straight answer on which ones hold up versus what's just marketing. Decent dive shops put out product guides and honest reviews on their websites too