Monitoring with Nagios and NRPE
Sharafuddin M.A
- 8 min read
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PADI Recreational Dive Planner (RDP) in metric is a foundational tool for planning no-decompression dives using meters rather than feet. While dive computers are now standard, mastering the manual RDP is critical for understanding nitrogen absorption and passing PADI certification exams Core General Rules Depth & Time Rounding : If your exact depth or time is not listed, always use the next greater value (e.g., a 13m dive is planned as 14m). Bottom Time Definition
: Calculated from the start of your descent to the beginning of your final ascent to the surface or safety stop. Ascent Rate : Do not exceed 18 meters per minute. Repetitive Dives
: Always plan your deepest dive first. Subsequent dives should be shallower, with a maximum depth limit of 30 meters for repetitive dives. www.divetalking.com
A very specific topic!
The PADI RDP (Residual Nitrogen Time) Table, also known as the Recreational Dive Planner, is a tool used by scuba divers to plan safe dives and avoid decompression sickness. Here is an informative text regarding the PADI RDP Table in metric units (depth in meters and time in minutes):
What is the PADI RDP Table?
The PADI RDP Table is a table that helps divers plan safe dives by calculating the maximum allowed dive time for a given depth, based on the amount of residual nitrogen in their body. The table takes into account the depth and time of previous dives, as well as the surface interval between dives.
How to use the PADI RDP Table (Metric Version)
The metric version of the PADI RDP Table is used as follows:
PADI RDP Table (Metric Version) - Key Points
Here are some sample values from the PADI RDP Table (metric version):
| Depth (m) | Single Dive Time (min) | Repetitive Dive Time (min) | | --- | --- | --- | | 10 | 55 | 45 | | 15 | 40 | 35 | | 20 | 30 | 25 | | 25 | 20 | 18 | | 30 | 15 | 12 |
Understanding the PADI RDP Table
The PADI RDP Table provides a conservative approach to dive planning, helping divers avoid excessive nitrogen absorption and reduce the risk of decompression sickness.
When using the table, keep in mind:
Download or Accessing the PADI RDP Table (Metric PDF)
You can find the PADI RDP Table in metric units in PDF format through various online resources, such as:
Make sure to verify the authenticity and accuracy of the table, as incorrect information can lead to serious safety risks.
By understanding and using the PADI RDP Table (metric version), divers can plan safe and enjoyable dives while minimizing the risks associated with scuba diving.
The PADI Recreational Dive Planner (RDP) metric version is a set of three tables used to calculate no-decompression limits (NDLs) and manage nitrogen levels for scuba diving. Core Tables Overview
The metric RDP is divided into three interconnected sections:
Table 1: Single Dive Planning – Provides NDLs for depths up to 42 meters and assigns a Pressure Group (PG) letter (A–Z) based on dive time and depth.
Table 2: Surface Interval Credit – Shows how your Pressure Group changes as you off-gas nitrogen during a surface interval (SI).
Table 3: Repetitive Dive Planning – Gives the Adjusted No-Decompression Limit (ANDL) and Residual Nitrogen Time (RNT) for subsequent dives based on your current Pressure Group. Critical Rules for Use
To ensure safety, you must strictly follow these table rules:
Round Up Only: If your exact depth or time is not listed, always use the next higher (deeper or longer) value.
Safety Stops: Required if you dive to 30 meters or deeper, or if your dive ends in a gray box on the table. Padi Rdp Table Metric Pdf
Descent/Ascent Rates: Maintain a steady descent rate and an ascent rate no faster than 18 meters per minute.
The "Rule of 9": It is strongly recommended to make each successive repetitive dive shallower than the one before it.
WXYZ Rule: If you end a dive in pressure groups W or X, a minimum surface interval of 1 hour is required. For Y or Z, the minimum is 3 hours. Key Planning Metrics PADI RDP TABLE - Table Met | PDF | Scuba Diving - Scribd
PADI Recreational Dive Planner (RDP) (Metric version) is a specialized decompression table designed specifically for no-stop recreational diving. Unlike older tables like the US Navy versions, the PADI RDP was developed by Diving Science and Technology (DSAT) to better account for the nitrogen absorption patterns seen in multiple, repetitive dives. Core Function and Structure
The RDP consists of three interconnected tables used to calculate safe "no-decompression limits" (NDLs), which is the maximum time a diver can stay at a specific depth without requiring decompression stops during ascent. Table 1: No-Decompression Limits & Group Designation : Maps your depth and time to a Pressure Group
(a letter from A to Z) representing the amount of residual nitrogen in your body. Table 2: Surface Interval Table
: 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)
, which must be added to your actual planned dive time for your next dive to ensure you don't exceed safety limits. goprocaribbean.com Key Safety Rules for the Metric RDP
To plan a second dive, you use the "Rule of Thirds" or the table on the back/bottom of the card to calculate Residual Nitrogen Time.
The short answer: No. You will waste hours searching for a file that either doesn't exist legitimately or is too poor quality to trust your life with.
The practical solution: Spend the $15 to $30 on the official PADI eRDP (digital) or the waterproof plastic table. Your safety is worth more than the price of a few tank fills. If you are simply studying for an exam, your dive instructor likely has a high-resolution digital copy they can share specifically for classroom use.
Remember: Dive tables are life-support equipment. Use the metric system properly—calculate your meters and minutes carefully—and always plan your dive, then dive your plan.
Disclaimer: This article is for educational purposes. PADI, RDP, and Recreational Dive Planner are registered trademarks of PADI. Always seek formal training from a certified professional before diving.
The PADI Recreational Dive Planner (RDP) metric version is a specialized tool used by scuba divers to calculate No Decompression Limits (NDL) and track nitrogen absorption across multiple dives. Unlike the imperial version, which uses feet, the metric table uses meters (m) to represent depth. 🛠️ Core Functions of the Metric RDP
The planner consists of three primary tables designed to be used in sequence: Table 1: No Decompression Limits
Finds the maximum time allowed at a specific depth for a first dive.
Assigns a Pressure Group letter (A–Z) based on depth and time. Table 2: Surface Interval Credit
Tracks how much nitrogen "off-gasses" while you are on the surface.
Assigns a new, lower Pressure Group based on your time out of the water. Table 3: Repetitive Dive Timetable
Calculates Residual Nitrogen Time (RNT) from previous dives.
Provides the Adjusted No Decompression Limit (ANDL) for your next dive. 📏 Key Metric Limits & Rules
When using the metric table, divers must adhere to specific rounding and safety rules:
Depth Rounding: If your exact depth is not on the table, always round up to the next greater depth (e.g., 11m becomes 12m).
Time Rounding: If your exact dive time is not shown, round up to the next value.
Maximum Depth: The recreational limit for most dives is 40 meters. Open Water divers are typically limited to 18 meters.
Safety Stops: Recommended for all dives at 5 meters for 3 minutes. They are mandatory if you come within three pressure groups of a limit. 🔄 Metric vs. Imperial Differences PADI Recreational Dive Planner (RDP) in metric is
While the planning method is identical, the values differ slightly due to rounding: Metric System Imperial System Depth Unit Meters (m) Max Depth Safety Stop NDL Example (10m/33ft) 219 minutes 205 minutes
Note: Never mix metric and imperial tables for the same dive series, as nitrogen tracking will become inaccurate. 💾 Essential Definitions
Actual Bottom Time (ABT): The total time spent underwater during a single dive.
Residual Nitrogen Time (RNT): Theoretical minutes added to a dive to account for nitrogen still in your body. Total Bottom Time (TBT): The sum of ABT and RNT ( ), used to find your final Pressure Group. The duration of that dive
How long you plan to stay on the surface before the next dive
I can then walk you through calculating your Pressure Groups and limits! Metric or Imperial? - Jump - Sail - Dive
The Recreational Dive Planner (RDP) is an essential tool for any scuba diver. Developed by PADI (Professional Association of Diving Instructors), it helps divers calculate their remaining Nitrogen limits to avoid Decompression Sickness (DCS).
While many modern divers use dive computers, understanding the Padi Rdp Table Metric Pdf is a core requirement for passing the Open Water Diver course. It serves as a vital backup and teaches the fundamental science of gas absorption. 📘 Understanding the PADI RDP Table (Metric)
The metric version of the RDP uses meters for depth and minutes for time. Unlike the US Imperial version (feet), the metric table is the global standard for most diving destinations outside the United States. The Purpose of the RDP Prevent DCS: Keeps you within "No Decompression" limits.
Track Nitrogen: Assigns a "Pressure Group" (letter A–Z) based on nitrogen levels.
Plan Surface Intervals: Calculates how much nitrogen leaves your body while on the boat.
Calculate Multiple Dives: Adjusts your limits for second or third dives in a single day. 🛠️ How to Read the Three-Table System
The PADI RDP is comprised of three distinct tables, usually printed on two sides of a waterproof card or available as a digital PDF. Table 1: Dive Profile & Pressure Group
This table correlates your Maximum Depth with your Actual Bottom Time. Find your depth at the top. Follow the column down to your dive time.
Follow the row to the right to find your Pressure Group letter. Table 2: Surface Interval Credit Nitrogen leaves your body as you breathe at the surface. Find your Pressure Group from Table 1.
Follow the row until you find a time range that includes your Surface Interval (the time you spent out of the water). Follow the column down to find your New Pressure Group. Table 3: Repetitive Dive Timings
This table tells you how much "residual nitrogen" you have left and how long you can stay down on your next dive. Use your New Pressure Group from Table 2. Find your planned depth for the next dive.
The intersection provides two numbers: Residual Nitrogen Time (RNT) and Adjusted No Decompression Limit (ANDL). 📏 Key Terms to Remember
No Decompression Limit (NDL): The maximum time you can stay at a depth without needing a decompression stop.
Pressure Group: A letter representing the theoretical amount of nitrogen in your tissues.
Safety Stop: A 3-minute pause at 5 meters, required for dives deeper than 30 meters or when approaching NDLs.
Bottom Time: Total time from the start of the descent to the beginning of the final ascent. 📥 Why You Need a PDF Version
Carrying a physical plastic slate is standard, but having a Padi Rdp Table Metric Pdf on your smartphone or tablet is highly beneficial for: Pre-Trip Planning: Checking limits at home before you pack.
Study Aid: Practicing "find the Pressure Group" problems for the PADI exam.
Emergency Backup: A digital copy ensures you are never without a planning tool if your computer fails. ⚠️ Important Safety Limitations The RDP is designed for recreational diving only. Never exceed the "blacked out" areas of the table. Avoid "yo-yo" diving (going up and down repeatedly).
Ascent Rate: Always ascend slower than 18 meters per minute. Determine the maximum depth of your dive in meters
Altitude: These tables are not for dives above 300 meters elevation.
Are you currently studying for your Open Water certification?
Do you have a specific dive profile (Depth/Time) you want to practice calculating?
The PADI Recreational Dive Planner (RDP) Table (Metric) is a foundational, non-electronic tool for calculating safe "no-decompression" limits, utilizing a three-table system to plan repetitive dives in meters. While requiring a learning curve to master pressure groups, it serves as a reliable, essential backup to modern dive computers. For a visual guide to learning the tables, see this YouTube video. PADI RDP TABLE - Table Met | PDF | Scuba Diving - Scribd
Marta flattened the damp, salt-crusted printout on the dive boat’s bench. It was the RDP – the Recreational Dive Planner – in metric. A PDF she’d downloaded last night at the hostel, because her expensive dive computer had decided, at 22 meters, that its battery was a suggestion, not a requirement.
“You’re really going to do it with tables?” Leo, the DM, smirked, tapping his wrist-mounted computer. “Ancient history, babe.”
Marta didn’t answer. She traced her finger down the “40m” row. Her first dive: 24 minutes at 38 meters. She slid across to the Pressure Group: R. Then she flipped to Table 3 – the Surface Interval Credit. 2 hours and 15 minutes on the surface, drinking sweet tea and trying to forget the thrum in her ears.
Credit back to D.
Now for dive two. Planned depth: 28 meters. She ran her finger down from D to the 28m column. Her allowable bottom time was 19 minutes. The new computer on her wrist, Leo’s backup, was beeping 24 minutes already.
She looked at the wavering reef below. A massive green turtle, unbothered, soared over a fan coral. Her fin twitched. Just five more minutes. Who uses tables anymore?
But she remembered the feeling from the PDF – the tiny red numbers in the “Residual Nitrogen Time” box. That little crosshatched cell that just said No Stop Limits. The table didn’t argue. It didn’t glitch. It just stated a hard, mathematical truth: 28m for 24 minutes from Group D put you into Deco. Mandatory stop. And if you ignored it…
She tapped Leo on the tank. Held up five fingers, then pointed up. He raised an eyebrow but signaled back: Okay, but why? She just tapped her paper RDP, which flapped in the breeze.
On the way up, her safety stop at 5 meters, she felt it anyway – a faint, itchy ache in her right shoulder. Psychosomatic, probably. But as she broke surface and Leo gave her a confused thumbs-up, she held up the clingy PDF.
“My computer didn’t lie,” she said. “The table doesn’t know I’m young. It doesn’t know I’m hydrated. It just knows nitrogen. And nitrogen never forgets.”
That night, she laminated the PDF at a copy shop in Krabi. On the back, she wrote: Dive computer: tool. RDP: truth. And she never dove without it again.
The PADI Recreational Dive Planner (RDP) Metric Table, developed by DSAT, is a tool for managing nitrogen absorption during no-stop dives up to 40 meters, utilizing pressure groups from A to Z to calculate residual nitrogen. The system consists of three tables for managing, calculating, and planning repetitive dives, requiring divers to always round up depth and time to the next greater value. View the PADI Metric RDP PDF provided by A1 Scuba Diving.
Reading Dive Tables : 5 Steps (with Pictures) - Instructables
The PADI Recreational Dive Planner (RDP) in its metric version is a fundamental tool for managing nitrogen absorption and ensuring safety for recreational divers. Unlike Navy tables designed for deep or commercial work, the RDP was the first table created specifically for "no-stop" recreational diving, providing more liberal limits for the multi-level, shallower dives typically enjoyed by sport divers. Core Structure of the Metric RDP
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.
Table 1 (No Decompression Limits): Used for your first dive to find your starting Pressure Group based on depth (in meters) and bottom time.
Table 2 (Surface Interval Credit): Calculates how much nitrogen leaves your body while you are out of the water. Your Pressure Group "recedes" (e.g., from N to D) as time passes.
Table 3 (Repetitive Dive Planning): 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
To use the tables accurately and safely, divers must adhere to several non-negotiable rules:
The PADI RDP Table Metric PDF is an essential, non‑electronic backup for every diver who plans repetitive dives in meters. It is compact, reliable, and forms the foundation of dive planning skills in the PADI system. This write‑up serves as both a user guide and a content specification for creating or referencing the official PDF document.
Always dive within your training, plan your dive, and dive your plan.
