
The main piece of information provided by a dive computer is the no-stop limit. A computer program will factor in depth and air, and calculate the limit. This program will then provide data on when to decompress or begin ascent. This information is also known by the "no remaining stop time".
Different preferences
There are several differences between different dive computers, but most do the same basic functions, such as displaying depth, tracking nitrogen loading, ascent rate, and logging the dive. Divers may choose one type of diving computer over another due to the fact that it offers different NDL times. The settings that are recommended for one computer might not be appropriate for another. Therefore, it is important to plan a dive before purchasing a dive computer. Also, compare various models before deciding which one is best for you.

Functions
A dive computer is designed to help you stay safe when you're underwater. It will run calculations using your information and then compare that information with the relevant dive tables to determine how long you have at deep. The calculations are not difficult to understand, but it's important to be familiar with the range of your computer's liberal-conservative bias. A liberal-leaning computer is the best choice if you want to maximize your bottom line and increase safety.
Display
The dive computer's display screen, whether mounted on a wrist-mounted pressure gauge or mounted on a submersible water gauge, provides data that can help to avoid decompression. Divers may find it useful to have additional features such as water temperature and compass direction. Diver computers may even let users download their data to a personal PC, which can prove helpful for accident investigators. These features can make a divecomputer invaluable, especially for investigating the cause of an accidental accident.
Safety limits
Diver computers can use many algorithms to calculate the decompression time. Although acceptable DCS is between two and five percent, these numbers can vary depending on individual vulnerability and accidents. The US Navy, commercial diving and other organizations often strive to achieve DCS levels of 0.1 percent or 0.025%. To ensure maximum safety, a dive computer should be able correctly run the decompression algorithm. But diving with a computer can be more complicated than it looks.

Cost
It is crucial to choose the right dive computer for you in order to avoid any diving accidents. These devices use algorithms in order to determine how long a diver will be able stay underwater. While the algorithms for most dive computers are very generic, divers will have their own unique body composition or fitness levels. Different machines will recommend different stops. Some machines will recommend more no-flys than others. You can stay underwater for longer with any dive computer, regardless of what brand.