What should be included in the dive log and why is it important?

• A. Dive plan, start/end times, depths, gas usage, hazards, and any incidents; essential for regulatory compliance and incident investigation.
• B. The diver's personal opinions about the dive.
• C. Only the time.
• D. Gas usage only.

Answer: (A)

The main idea being tested is that a dive log should capture key dive details so safety, accountability, and learning can happen after each dive. Including the dive plan, start and end times, depths, gas usage, hazards, and any incidents creates a complete record of what was intended and what occurred.

The dive plan communicates the planned parameters and gas management, so supervisors and when needed investigators can see whether procedures were followed and risk was controlled. Start and end times and depths give a verifiable record of bottom time and exposure, which are essential for evaluating decompression status, planning future dives, and reviewing how the dive actually unfolded. Gas usage shows how much air or breathing gas was consumed and helps determine whether reserves were adequate, which is crucial for ongoing safety on subsequent dives. Recording hazards and incidents captures environmental conditions, equipment issues, or near-misses, enabling thorough review, learning, and trend analysis to prevent repeats.

This type of documentation is important for regulatory compliance, incident investigation, training verification, insurance considerations, and informed planning for future dives. A log that leaves out any of these elements misses critical data needed for safety and accountability.