The metric RDP consists of three integrated tables designed to track your "Pressure Group"—a letter from A to Z representing the residual nitrogen remaining in your body.

Tracks how much nitrogen "off-gasses" while you are on the surface.

The planner consists of three primary tables designed to be used in sequence:

: Shows how much nitrogen leaves your body during a break on the surface. You enter with your ending pressure group and exit with a new, lower pressure group based on time spent out of the water. Table 3: Repetitive Dive Timetable : Used to find your Residual Nitrogen Time (RNT)

Accounts for residual nitrogen when planning a second or third dive. It provides your Adjusted No Decompression Limit (ANDL) , which is the maximum time you can safely stay at a specific depth given your current nitrogen load. Essential Rules for Safe Planning

Step-by-Step Guide: Planning a Repetitive Dive Using the Metric Table

Find your current Pressure Group () along the top row and your next planned depth ( 15m ) along the side.

Read directly down from that box to the bottom of the chart to find your new Pressure Group. Result: After

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Follow that row horizontally to the left to find your new Pressure Group letter.

Before running a calculation, you must understand these five foundational terms:

The Ultimate Guide to the PADI RDP Table Metric PDF: How to Plan Safe Dives Manually

This comprehensive guide covers how the metric RDP table works, how to read it, and how to use a digital PDF version to plan safe, successful dives. What is the PADI RDP Table (Metric Version)?

You enter the table with your ending Pressure Group from your previous dive, move across based on your Surface Interval (SI) time, and exit with a new, lower Pressure Group letter. Table 3: Repetitive Dive Timetable

Provides the Adjusted No Decompression Limit (ANDL) for your next dive, accounting for the nitrogen still in your system. Step-by-Step: How to Use the Metric RDP

is a foundational skill that ensures you can plan your dives safely, even if your tech fails.

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| Feature | Benefit | |---------|---------| | | Laminate for underwater slate or wet notes. | | No battery | 100% reliable on liveaboards or remote sites. | | Standardized | Matches PADI course materials globally. | | Searchable | Digital version allows “find” for depth/letter group. | | Free distribution | Dive shops/instructors can share legally with PADI permission (or with student materials). |

When using the metric table, divers must adhere to specific rounding and safety rules: