Dive Computer Guide: Do You Need One

Back in the day, tables were how everyone dived. At this point, most scuba divers dive with a dive computer and they should.

The computer calculates depth, time, speed of ascent, and no-deco limits in real-time. Dive tables are a fixed calculation. When you move between depths during a dive, the computer recalculates. A table can't.

Watch-style computers are what most people use now. They're small enough, easy to read, and you can use them as a regular watch between dives. Console-mount models are available but less buyers go discover more that way now.

Basic computers start around $300-odd and cover everything the average diver would need. Features include depth tracking, dive time, NDL, log function, and sometimes an entry-level freedive function. Mid-range adds air integration, better readability, and extra gas compatibility.

The one thing new divers overlook is conservatism settings. Some models are more conservative than others. A tighter setting means reduced bottom time. Liberal algorithms extend time but at a thinner buffer. Both work. It just personal preference and your diving background.

Worth talking to people at a dive shop who dives with various models before you decide. Good dive stores will offer honest opinions on what's good and what isn't just marketing. The better Cairns dive stores publish product guides and rundowns on their websites as well