
The no-stop limit is what a dive computer gives you. A computer program will take into account depth and air in order to calculate this limit and offer data on when to begin the ascent or decompression stop. This data is also known as the "no stop time remaining."
Preferences of different people
There are many differences among different dive computers. However, all of them perform the same basic functions like displaying depth and tracking nitrogen loading. Divers might choose to use a different type of computer because they have different NDL times. As a result, the recommended settings for a specific computer may be different than those prescribed for another diver. Before you buy a dive computer, plan your dive and compare the models to find the best one for you.

Functions
A dive computer is designed for safety underwater. It calculates based on your information. Next, it compares that information to the dive tables in order to calculate how much time you have at sea. It doesn't take a genius math mind to understand the calculations. However, you should have an idea of where your diver computer falls on the liberal-conservative spectrum. Liberal-leaning computers are the best for maximizing your bottom time and ensuring safety.
Display
Whether wrist-mounted or mounted on a submersible pressure gauge, a dive computer's display screen provides the necessary data to avoid decompression and ensure a safe dive. Some dive computers also offer extra features, such as compass direction and water temperature, which may be important to divers. Many dive computers allow users to download their data onto a personal computer. This can be useful for accident investigators. These features can make a divecomputer invaluable, especially for investigating the cause of an accidental accident.
Safety limits
Diver computers use a range algorithms to calculate decompression rates. Although acceptable DCS is between two and five percent, these numbers can vary depending on individual vulnerability and accidents. The US Navy and commercial divers often want to achieve 0.1 percent mild DCS or 0.025% serious DCS. For maximum safety, a divecomputer should be able run decompression algorithms correctly. However, diving with a dive computer may not be as simple as it seems.

Cost
Diver accidents can be prevented by choosing the correct computer for you. These devices use algorithms which determine how long a diver is able to stay underwater. The algorithms of most dive computers are fairly generic, but each diver will have slightly different body composition or fitness levels. Different machines will recommend different stops. Some machines will recommend more no-flys than others. It doesn't matter what dive computer you choose; it will allow you to stay underwater for longer periods of time and lower the chance of getting decompression sickness.