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5.3. Dive computer limitations

While the dive computer's calculations are based on current decompression research

and technology, it is important to realize that the computer cannot monitor the actual

physiological functions of an individual diver. All decompression schedules currently

known to the authors, including the U.S. Navy Tables, are based on theoretical

mathematical models, which are intended to serve as a guide to reduce the probability

of decompression illness.

5.4. Nitrox

Diving with nitrox provides you with an opportunity to increase bottom times or reduce

the risk of decompression illness by reducing the nitrogen content in the gas mix.

However, when the gas mix is altered, the oxygen content of the mix is generally

increased. This increase exposes the diver to an oxygen toxicity risk not usually

considered in recreational diving. In order to manage this risk, the dive computer tracks

the time and intensity of the oxygen exposure and provides the diver with information

to adjust the dive plan in order to maintain oxygen exposure within reasonably safe

limits.

In addition to the physiological effects of enriched air on the body, there are operational

considerations to be addressed when handling altered breathing mixes. Elevated

concentrations of oxygen present a fire or explosion hazard. Consult the manufacturer

of your equipment to check its compatibility with nitrox.

5.5. Freediving

Freediving, and particularly freediving in combination with scuba diving, may present

risks that have not been researched and are not commonly known.