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The no-decompression limit at 18 meters is 48 minutes and that will take you to pressure group S. This information can be found in any Table or wheel RDP (recreational diving planner) and it is basic. If you do not know how to use this table, you shouldn't really be diving. If you are in a course, then you will have a lot of time to practice. Dont forget to dive well within your no decompression limit. Live on the edge, Dive safe.
NoD limit for 18m (or 60ft) is 60 minutes. Anything past 60 minutes you will owe decompression. Thats if you have enough air to be at that depth for that long.
As long as he wants if he has enough gas to do the required decompression. But if you are asking what the no-stop time limit is, it doesn't exists since any dive to 100 meters (328 feet) requires mandatory decompression.
Scuba divers who surface too quickly after a deep dive are prone to decompression sickness.
use your log book enter all info into PDC
The most basic function of a diving computer is to track decompression status so divers don't get sick in the water. They can also help make calculating dive tables, depths and times easier.
1. Discontinue Dive 2.Seek Medical Attention 3. Consult a dive physician.
Don't dive too deep. Don't exceed no-decompression limits for the depth you dive to. (limits are available in any of the dive calculating tables) Ascend at a slow pace.
2 hours 29minutes
48 minutes
1 hour and 45 minutes
It depends on many variables, such as the time the diver stays at a particular depth, the temperature, level of diver exertion, diver's physiology, etc, etc. Dive tables or a dive computer is used to calculate how long it is safe for the diver to stay submerged. The primary limitation on dive duration/depth during a day is how much Nitrogen the diver has absorbed into his or her tissues. Exceeding the safe limits can cause decompression illness. These limits are only rough guidelines however, as some people are at higher/lower risk for decompression illness based on their physiology, level of heath and fitness, and other factors.