A dive computer will provide the main piece of information, which 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 data is also known to be the "no stopping time remaining".
Divers' preferences
Although there are many differences in the functions of different dive computers, they all perform the same basic functions such as tracking nitrogen loading and ascent rate and displaying the depth. Divers may choose to use one type of dive computer instead of another because it gives different NDL times. Divers may choose to use a different type of computer than what is recommended. It is important to plan your dive before purchasing a computer, and to test them out before you decide which model will be best for you.
Functions
Dive computers are designed to keep you safe 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. While you don't necessarily need to know the formulas, you should be able to identify where your dive computer is on the liberal-conservative spectrum. Liberal-leaning computers are the best for maximizing your bottom time and ensuring safety.
Display
Display screens on dive computers can be wrist-mounted, submersible pressure gauge mounted or both. They provide the information necessary to avoid decompression as well as ensure safe diving. Divers may find it useful to have additional features such as water temperature and compass direction. Some dive computers even allow users to download their data to a personal computer, which may be helpful to accident investigators. A dive computer is able to perform many functions, including helping to determine the cause of an incident.
Safety limits
Dive computers use a range of algorithms to calculate decompression times. Although acceptable DCS is between two and five percent, these numbers can vary depending on individual vulnerability and accidents. The US Navy and commercial diving communities often aim for a 0.1 percent mild to 0.025% serious DCS. To ensure maximum safety, a dive computer should be able correctly run the decompression algorithm. Divers may find it difficult to use a computer to dive.
Prices
Choosing the correct dive computer for your needs is essential to prevent any accidents while diving. These devices use algorithms to determine the maximum time a diver can stay under water. Although most computers use the same algorithms, each diver's body composition and fitness levels will be different. Different machines will recommend different stops. Some machines will recommend more no-flys than others. No matter which dive computer you choose it will enable you to stay underwater longer and less likely to get decompression sick.