PADI Divemaster Certification Practice Exam

In using the RDP, how can one determine the adjusted no decompression limit (ANDL) for a repetitive dive?

1. Check temperature conditions during the dive

2. Calculate based on the previous dive depth and a surface interval

3. Estimate based on diver experience

4. Review logs of previous dives

The correct answer is: Calculate based on the previous dive depth and a surface interval

Determining the adjusted no decompression limit (ANDL) for a repetitive dive involves using a systematic approach based on the previous dive’s depth and the surface interval. When a diver completes a dive and then repeats a dive within a certain timeframe, the residual nitrogen in their body from the first dive affects the no decompression limits for the second dive. To accurately find the ANDL, one needs to refer to the Recreational Dive Planner (RDP), which provides tables and guidelines. These tables take into consideration the depth of the previous dive and the length of the surface interval, allowing for an adjustment to be made on the maximum allowable time for the new dive. This adjustment is crucial as it accounts for the diver's body still having some absorbed nitrogen from the earlier dive, which could lead to complications if ignored. The other options do not provide a methodical or reliable means to determine the ANDL. Checking temperature conditions or estimating based on diver experience do not take into account the actual physiological effects of previous dives. Reviewing logs of previous dives offers historical context but does not offer the specific calculations needed for the next dive within the RDP framework. Thus, calculating based on the previous dive depth and the surface interval is the correct approach to ensure safety