At what altitude are US Navy air decompression tables approved for depth without corrections?

The US Navy air decompression tables are specifically designed and validated for diving at depths below 300 feet without requiring any altitude corrections. This is significant because as divers go deeper, their bodies absorb more nitrogen, and the risk of decompression sickness increases. By maintaining the use of these tables within the 0-300 feet range, divers can safely follow the established guidelines without needing to adjust for the effects of higher altitudes, which can complicate decompression strategies.

When operating at altitudes above 300 feet, divers must take into account the decreased atmospheric pressure. This altered environment can affect nitrogen absorption and elimination, necessitating modified dive planning to prevent decompression sickness. Therefore, the approved altitude for using the US Navy air decompression tables directly reflects the safe operational limits of the tables without adjustments for altitude.