Dive Computers: Do You Need One

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Years ago, dive tables were how everyone dived. Today, most divers wear a wrist-mount computer and for good reason.

A dive computer calculates your depth, time, speed of ascent, and no-deco limits in the moment. Tables give you a static plan. When you move between depths mid-dive, the computer recalculates. A table can't.

Watch-style computers are what most people buy now. They're compact, readable underwater, and you can wear them as a regular watch between dives. Console computers are an option but not as many divers this resource choose them anymore.

Basic computers run about $250-400 and handle everything a recreational diver needs. You get depth tracking, dive time, no-deco limits, a logbook, and usually a simple freediving mode. Mid-range gets you transmitter compatibility, nicer readability, and extra gas compatibility.

The one thing new divers don't think about is algorithm differences. Certain algorithms are tighter than others. A tighter algorithm gives you reduced bottom time. Looser ones give more time but at reduced margin. It's not right or wrong. It comes down to your style and how experienced you are.

Talk to the staff at a local dive store who's used various computers before you decide. Good dive stores will give you honest opinions on what works versus what's hype. Decent dive shops publish product guides and rundowns online too

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