What adjustments must be made when planning dives at altitude?

When planning dives at altitude, adjustments for lower ambient pressure are essential due to the changes in the atmospheric pressure associated with elevation. As you ascend to higher altitudes, the ambient pressure decreases, which affects the way gases behave in the body and during diving operations.

In underwater diving, the partial pressure of gases — particularly nitrogen — is crucial to avoid issues such as decompression sickness. At lower ambient pressures, the amount of nitrogen dissolvable in the body is reduced. This means divers need to account for these effects by adjusting their dive profiles, which typically includes using a modified dive table or computer that reflects the decreased pressure.

In essence, the correct response emphasizes the need to recognize and adapt to the unique challenges that altitude presents to ensure safe diving practices. Understanding this adjustment is vital for safely managing nitrogen absorption and ensuring that divers follow appropriate limits and procedures at high altitude locations.