Dive Computer Guide: Do You Need One

Tables used to be how everyone dived. At this point, the majority of recreational divers use a dive computer and they should.

The computer monitors your depth, bottom time, ascent rate, and no-decompression limits in real-time. Tables can't do that. When you change depth partway through, it updates. Tables are set before you get in.

Wrist computers are the most common buy these days. They're compact, easy to read, and you can wear them as a watch as well. Console models are still around but less people pick them these days.

Entry-level computers start around $300-odd and do everything the average diver requires. You get depth tracking, here bottom time, NDL, log function, and usually an entry-level freedive function. Mid-range adds transmitter compatibility, improved screens, and extra mix modes.

The one thing buyers don't think about is conservatism settings. Certain models are more conservative than others. A cautious setting results in less NDL. Liberal algorithms allow longer time but at a thinner buffer. Both work. It just your style and how experienced you are.

Check with the staff at a dive shop who's used multiple computers before you decide. They'll offer a straight answer on what works and what's marketing. The better Cairns dive stores publish product guides and comparisons on their websites as well