Ratio decompression

Ratio decompression is a method used in scuba diving to calculate a decompression stop strategy. It is a rule-based approach that simplifies the complex calculations required in traditional decompression theory.

Overview

Ratio decompression was developed to provide a simpler and more intuitive method for planning decompression stops. It is based on the principle that the amount of nitrogen absorbed by a diver's body is directly proportional to the depth and duration of a dive. By using a set of ratios, divers can quickly calculate their decompression requirements without the need for complex mathematical calculations or reliance on dive computers.

Method

The method involves dividing the total depth of a dive by a specific ratio to determine the required decompression stop times. The ratios used are based on empirical data and vary depending on the type of dive and the gas mix used. For example, a common ratio used for air dives is 1:3, meaning that for every meter of depth, three minutes of decompression are required.

Advantages and Disadvantages

The main advantage of ratio decompression is its simplicity. It allows divers to quickly calculate their decompression requirements and adjust their dive plan accordingly. This can be particularly useful in situations where a dive computer is not available or fails during a dive.

However, ratio decompression also has its limitations. It is less precise than other methods of decompression planning and does not take into account factors such as individual physiological differences, previous dive history, or the effects of cold and exercise. As such, it should be used with caution and as part of a comprehensive dive plan.

See Also

• Decompression (diving)
• Decompression sickness
• Dive computer
• Diving cylinder

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