What is a dive computer and do I need one?

A dive computer is an electronic device that tracks your depth, time, and ascent rate to help you stay within safe limits during a dive. It replaces traditional dive tables by automatically calculating how long you can remain at a given depth before needing to ascend. Most also show no-decompression time remaining, ascent speed, surface intervals, and temperature. They act as your personal record of pressure exposure across multiple dives.

You do not technically need a dive computer, but most modern divers use one because it is safer and far more convenient than tracking everything manually. It adjusts for your exact dive profile instead of assuming you stayed at one depth the entire time, which often gives you more usable bottom time. I will not dive without one. A dive computer is your single most important source of situational awareness underwater. Whether worn on your wrist or integrated into your console, it is one of the most valuable pieces of equipment you can own once you start diving regularly.

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