Dive Computer Buyer's Guide: Do You Need One

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Back in the day, tables were the only option. Now, nearly all scuba divers dive with a wrist-mount computer and for good reason.

A dive computer calculates depth, bottom time, speed of ascent, and no-decompression limits in real time. Dive tables are a fixed calculation. If you change depth during a dive, the computer recalculates. Tables are set before additional reading you get in.

Watch-style computers are what the majority of divers go for these days. They're compact, readable underwater, and you'll wear them as a watch as well. Console-mount computers are still around but less people choose them anymore.

Budget computers go for around $250-400 and handle everything most divers would need. Features include depth tracking, dive time, no-deco limits, a logbook, and usually a simple apnea mode. The $500-800 range adds wireless air monitoring, improved readability, and extra mix options.

Something people don't think about is conservatism settings. Some models are more cautious than others. A tighter computer means shorter bottom time. Looser algorithms extend time but at reduced safety margin. It's not right or wrong. It comes down to personal preference and your diving background.

Talk to someone at a dive shop who uses multiple brands first. Good dive stores will give you a straight answer on what works and what's marketing. Most good dive stores have buying guides and rundowns on their sites as well

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