Dive Computers: What to Know

Years ago, dive tables were the standard. Now, most recreational divers use a dive computer and they should.

The computer tracks depth, time, speed of ascent, and no-deco limits in the moment. Tables can't do that. If you move between depths mid-dive, it updates. Tables are set before you get in.

Watch-style extra resources computers are the most common buy these days. They're small enough, easy to read, and you'll wear them as a watch too. Console-mount models are still around but less buyers go that way anymore.

Basic computers start around $250-400 and do everything the average diver requires. You get depth, dive time, NDL, a logbook, and often a simple apnea mode. The $500-800 range includes transmitter compatibility, nicer readability, and extra mix modes.

Something people don't think about is how the computer handles. Certain computers are more conservative than others. A cautious computer gives you shorter NDL. Looser algorithms give more time but at reduced buffer. Both work. It comes down to personal preference and experience level.

Talk to people at a local dive store who's used multiple computers before you decide. Staff will offer a straight answer on what's good and what isn't marketing. Most good dive stores publish buying guides and comparisons online as well