Dive Computers: Practical Buyer's Guide for Reef Divers

Back in the day, tables were how everyone dived. Today, the majority of divers dive with a personal dive computer and for good reason.

The computer calculates depth, bottom time, speed of ascent, and no-decompression limits in real time. Dive tables are a fixed calculation. When you go shallower partway through, the computer recalculates. Tables are set before you get in.

Wrist-mount computers are the most common use now. They're small enough, easy to read, and you can wear them as a watch too. Console models are available but less buyers pick them these days.

Entry-level computers start around $250-400 and do everything most divers needs. Features include depth, dive time, NDL, dive logging, and sometimes an entry-level apnea mode. Mid-range includes wireless air monitoring, nicer readability, and more nitrox options.

Something new divers overlook is conservatism settings. Certain computers are tighter than others. A cautious other info algorithm means reduced no-deco time. More aggressive settings give more time but with less buffer. Both work. It just your style and your diving background.

Talk to someone at a local dive store who's used a few different models before you decide. They'll offer honest opinions on which ones hold up and what's hype. The better Cairns dive stores publish buying guides and comparisons on their websites too