How should divers record their EANx dives in their logbook?

Logging dives with enriched air nitrox (EANx) is crucial for maintaining a complete and accurate dive history, which helps in future dive planning and safety. By noting the gas mix, divers can ensure they are aware of the specific nitrox blend used during each dive. This is important for understanding the implications of that mix on the diver's no-decompression limits, surface intervals, and potential risks of oxygen toxicity, which can vary depending on the oxygen content of the gas.

Additionally, documenting any incidents or unusual occurrences during a dive can provide valuable information for future dives and can aid in identifying patterns or issues that need addressing. This comprehensive logging reinforces good practices and contributes to the overall safety and preparation for future diving activities.

The other options suggest a more limited approach to dive logging which does not capture the critical details necessary for safe diving with nitrox. Only logging the maximum depth or dive time fails to provide the important context and safety information that the gas mix provides, while stating that logging is unnecessary neglects the importance of tracking dive specifics and incidents.