Do You Need to Buy Your Own Dive Computer?

Back in the day, tables were the only option. Now, nearly all recreational divers dive with a dive computer and they should.

The computer calculates depth, bottom time, speed of ascent, and NDL in real time. Tables give you a static plan. When you move between depths mid-dive, a computer adjusts. Tables don't.

Wrist-mount computers are the most common buy these days. They're small enough, readable underwater, and you can use them as a regular watch between dives. Hose-mounted computers are available but not as many buyers pick them anymore.

Entry-level computers start around a few hundred dollars and cover everything most divers needs. They give you depth tracking, bottom time, no-deco limits, dive logging, and often a simple freediving mode. Stepping up to mid-range includes transmitter compatibility, improved readability, and extra nitrox modes.

What new divers don't think about is how the computer handles. Certain computers are more cautious than others. A cautious like this algorithm gives you reduced bottom time. Liberal algorithms give more bottom time but with less safety margin. Neither is wrong. It comes down to your style and experience level.

Talk to the staff at a Cairns dive shop who uses a few different computers before buying. Staff will have honest opinions on which ones hold up and what's just marketing. Most good dive stores publish buying guides and comparisons on their sites as well