What is one consideration when supervising divers not familiar with local altitude conditions?

When supervising divers who are not familiar with local altitude conditions, it is crucial to ensure that their dive computers are set appropriately for the environment in which they are diving. Specifically, diving at altitude can significantly affect how gas is absorbed and released by the body due to the lower atmospheric pressure.

Dive computers that are set for sea level do not account for these changes in pressure and can lead to erroneous readings and an increased risk of decompression sickness. Therefore, using dive computers that are correctly adjusted for altitude ensures that the divers are receiving accurate information regarding their time underwater and depth, which is vital for safe diving practices in higher elevation locations.

In contrast, using regular depth gauges and standard dive tables might not provide the needed adjustments for altitude, which could compromise safety. Providing a detailed map of local wildlife, although useful for general knowledge and interest, does not relate to the critical safety considerations involved in altitude diving supervision.