You can plan your dive and dive your plan using dive tables, a depth gauge and dive watch, but most scuba divers use a dive computer – it’s easier. A dive computer provides the real-time dive information you need, continually analyzing your depth – giving you more bottom time for going shallower and allowing you to maximize your dive time.
A dive computer takes depth and time information and applies it to a decompression model to track the dissolved nitrogen in your body during a dive. Your computer continuously tells you how much dive time you safely have remaining. Your computer combines a depth gauge, timer and sometimes a submersible pressure gauge (SPG) into a single, useful instrument. The majority of divers have a computer because it makes sense.
Computer Diver specialty course is intended to teach you how to use one and give you more advice about dive computers.