What is the purpose of using a dive computer or tables during Nitrox diving?

The primary purpose of using a dive computer or dive tables during Nitrox diving is to manage no-decompression limits and avoid overexposure to nitrogen. When divers use enriched air (Nitrox), the composition of the gas being breathed has less nitrogen than standard air, which changes the way divers need to plan their dives.

Divers rely on dive computers or tables to determine the safe limits for time and depth to prevent nitrogen narcosis or decompression sickness. By keeping track of nitrogen absorption based on the specific mix of gases being used, divers can safely extend their bottom times or increase their safety margins.

While tracking depth and duration of the dive, monitoring heart rates, and ensuring proper equipment use are important aspects of diving safety, they are not the primary reason for using a dive computer or tables in the context of managing Nitrox dives. The foremost goal is ensuring safe exposure to the gases involved, thus making dive computers and tables critical tools for dive planning and safety.