A dive log should ideally also include which of the following?

A dive log serves as an important record for divers, capturing essential information about each dive. Including incidents or observations during the dive is crucial because it allows divers to track their experiences, learn from them, and improve their skills over time. Documenting observations can also provide valuable data for future dives, help with identifying patterns or changes in dive sites, and contribute to the overall safety and enjoyment of diving activities.

In contrast, while previous certifications, the name of the dive master, and the amount of air consumed are indeed important elements, they do not provide as direct a benefit in terms of ongoing learning and situational awareness as recording incidents or observations does. They may be part of the log but are secondary to reflecting on the actual experiences encountered during dives.