What are two essential considerations when planning multiple dives using EANx?

When planning multiple dives using Enriched Air Nitrox (EANx), adjusting maximum depth and managing surface intervals are crucial considerations.

The primary reason for adjusting maximum depth lies in the relationship between the percentage of oxygen in the EANx mixture and the depth of the dive. Higher nitrogen content at greater depths increases the risk of nitrogen narcosis and other decompression-related issues. Understanding the maximum depth for the specific blend of EANx being used helps in avoiding accidental exceeding of the operational limits for that gas.

Managing surface intervals is equally important as it allows the body to eliminate accumulated nitrogen from previous dives during the break between dives. Surface intervals provide necessary time for decompression, especially after deeper dives or when higher percentages of nitrogen are used. A well-planned surface interval helps to minimize the risk of decompression sickness on subsequent dives, ensuring that the diver remains safe throughout the diving activity.

Focusing on these factors is vital for maintaining safety and optimizing nitrogen loading and off-gassing, which are key to a successful multi-dive experience using EANx.