From Nicholas McLaren,
Your Guide to Scuba Diving.
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Definition: The most basic dive computers will tell you your depth and dive time but it is also common for dive computers to calculate no-decompression limits over multiple dives. Many newer dive computers will also track air consumption and temperature and some even have built-in electronic compasses. Dive computers are commonly found attached to gauge consoles or worn on the wrist like a watch and can now be found built into masks.

Also Known As: Bottom Timer, Dive Watch