What is the acceptable rate of ascent when using NAUI dive tables?

The acceptable rate of ascent when using NAUI dive tables is generally established to ensure divers can safely return to the surface while minimizing the risk of decompression sickness, also known as "the bends." The recommended ascent rate is 30 feet per minute, which allows divers to ascend quickly enough to avoid prolonged exposure to increased pressures while still providing enough time for inert gases, such as nitrogen, to safely leave the body.

This ascent rate helps facilitate controlled and gradual decompression, which is crucial for maintaining safety during a dive. Ascending too quickly can lead to the formation of gas bubbles in the bloodstream, resulting in serious health risks. Therefore, maintaining an ascent rate of 30 feet per minute is a guideline that promotes diver safety.

In this context, the other suggested rates are not consistent with the NAUI guidelines for safe ascent, as they either exceed recommended limits or fail to emphasize the importance of a controlled ascent in preventing dive-related injuries. Adhering to the established ascent rate helps ensure divers return to the surface safely and without complications.