What feature enables a dive computer to calculate more efficient decompression dives?

The feature that enables a dive computer to calculate more efficient decompression dives is time-to-surface calculation. This function allows the dive computer to analyze the current depth and remaining air supply and predict the optimal ascent profile based on the diver's exposure to pressures and the gas mix being used.

Knowing the time to the surface helps divers manage their ascent rate and decompression stops effectively. It assists in avoiding rapid ascents which can lead to decompression sickness by providing a calculated ascent strategy based on real-time data. This feature is particularly valuable for planning safe and efficient decompression profiles, ensuring that divers spend the appropriate time at required depths during their ascent.

Other features, while important, serve different purposes. Depth tracking monitors how deep the diver is, which is essential for safety but does not directly influence decompression efficiency. An ascent rate indicator helps divers maintain a safe ascent pace but does not calculate decompression stops. Gas mix adjustment is crucial for nitrogen management and can affect decompression outcomes, but it operates within the context of the broader dive plan rather than the immediate calculation of ascent dynamics.