How many methods should be used to determine the depth at a dive site before operations?

Using two methods to determine the depth at a dive site before operations is considered best practice for safety and accuracy. Relying on one method alone may not provide a comprehensive understanding of the site’s depth, leading to potential hazards during the dive. For instance, the first method could be a direct measurement using a dive computer or depth gauge, while the second method might involve referencing nautical charts or other navigational aids that provide depth information.

Employing two methods ensures that the diver or supervisor cross-verifies the data, reducing the chances of error due to equipment malfunction or inaccuracies in charts. This approach reflects a commitment to safety and thoroughness, essential principles in scuba diving operations. By utilizing multiple sources of information, divers can better plan their dive, assess potential risks, and enhance overall situational awareness.