Why is it important to keep a log of EANx dives?

Keeping a log of EANx (Enriched Air Nitrox) dives is crucial for tracking exposure to both oxygen and nitrogen. When diving with enriched air, the higher percentage of oxygen can lead to increased oxygen toxicity if exposure limits are exceeded, particularly at greater depths and during longer dive times. Monitoring dive profiles in conjunction with oxygen exposure helps to ensure that divers remain within safe limits and reduces the risk of oxygen toxicity.

Moreover, tracking nitrogen exposure is equally important as it helps divers understand their residual nitrogen load from previous dives, which can influence planning for subsequent dives. This information is essential for managing safe ascent rates and minimizing the risk of decompression sickness.

By logging dives, divers can refer back to their previous experiences, which aids in future dive planning and increases overall safety. This practice also serves as a valuable record for divers' experience levels and certifications.