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as per / von: 01 / 2024

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• Here we put together a hit list of the top most queries,
• i.e. all these search strings which the users key into a search engine,
• these strings are quoted here literally.
• (It means, we are not responsible for a cryptic syntax or a weird expression)
• But anyway we try to provide here a section with:
• Questions & Answers ( Q & A )
• to these search strings
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• Promise!

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  Abbreviations / Abkuerzungen

  here we used the following abbreviations for the A-sections:

• RG: Repetitive Group / Wiederholungs Gruppe
• SI: Surface Intervall / Oberflaechenpause
• NDL: No Decompression Limit / Nullzeitgrenze
• n.a.: not applicable

  The following tables for Air Diving are used / folgende Tabellen fuer Luft-TG werden benutzt:

• PADI RDP(r)
• USN old
• USN 2008
• DCIEM
• DECO 2000

  Nota Bene:
  please be aware that the letters of the RG are not interchangeable from the various tables!
  I.e.: a "F" from the DCIEM is something completely different from a "F" in the DECO 2000 or the USN system
  due to the different methods in calculating and the different decompression algorithms.
  The only comparable parameters are the physical ones, for e.g. a time in minutes.
  I.e.: varying NDL or varying length and/or depth of the deco stops.

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  Q & A:
  latest first / die aktuellste zuerst
  (last update: 01/2024)

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  Q: using the rdp table what is the ending pressure group for the following three dive profile?
  dive 1 24 m/82 ft for 20 minutes surface interval 44 minutes
  dive 2 16 m/49 ft for 33 minutes surface interval 37 minutes
  dive 3 11 m/38 ft for 61 minutes ?

  A:
  for BOTH versions (IMPERIAL & METRIC) it is: W
  even if inbetween they differ and the conversion ft/m is different as per above ...

  IMPERIAL Version:
  dive 1 – 82 ft for 20 minutes: ==> 90 ft / 21': M
  surface interval – 44 minutes: M ==> F, 49 ft -> 50 ft / RNT: 24'
  dive 2 – 49 ft for 33 minutes: 50 ft, 33 + 24 = 57': R
  surface interval – 37 minutes: R ==> J, 38 ft -> 40 ft / RNT: 44'
  dive 3 – 38 ft for 61 minutes: 40 ft, 61 + 44 = 105'--> 111': W

  METRIC Version:
  dive 1 – 24 m for 20 minutes: 25 m / 21': K
  surface interval – 44 minutes: K ==> E, RNT: 21'
  dive 2 – 16 m for 33 minutes: 16 m, 33 + 21 = 54', 56': S
  surface interval – 37 minutes: S ==> K, 12 m / RNT: 49'
  dive 3 – 11 m for 61 minutes: 12 m, 61 + 49 = 110' -> 116': W

  using the conversion factors from the USN Diving Manual Rev. 7
  from feet (length) to m (length) and NOT from FSW (pressure)
  82 ft -> 24.99 = 25 m
  49 ft -> 14.94 = 15 m
  38 ft -> 11.58 = 12 m

  Q: 11 m 39 feet and stay for 46 minutes what would your pressure group?

  A:
  => 11 m --> 12 m, 39 feet --> 40 feet
• PADI RDP: 12 m (NDL 147 min), 49 min --> RG K
• USN old: 40 ft (NDL 200 min), 50 min --> RG F
• USN 2008: 40 ft (NDL 163 min), 53 min --> RG F
• DCIEM: 40 ft (NDL 150 min), 60 min --> RG D
• ZH-86: 12 m, 125 min --> RG G, req. deco stop 3 m / 1 min
• DECO 2000: 12 m (NDL 140 min), 54 min --> RG E

  Q: decompression time after a 90 minute 48 foot dive

  A:
  => 48 feet --> 50 feet / 15,2 m (--> 16 m resp. 18 m)
• PADI RDP: RG n.a. (NDL 72 min)
• USN old: (50 feet / 90 min) RG K --> No Stop Dive
• USN 2008: (50 feet / 92 min) RG M -->No Stop Dive
• DCIEM: (50 feet / 100 min) RG I, deco stop: 10 feet / 6 min
• DECO 2000: (18 m / 90 min) RG n.a. deco stop: 3 m / 25 min

  Q: 50' diving ndl

  A:
  => 50 feet --> 15,2 m (--> 16 m resp. 18 m)
• PADI RDP: NDL 72 min
• USN old: NDL 100 min
• USN 2008: NDL 92 min
• DCIEM: NDL 75 min
• DECO 2000: (15 m) NDL 72 min, (16 m --> 18 m) NDL 45 min

  Q: diving for 45 minutes on 16 meter

  A:
• PADI RDP: RG O
• USN old: (60 feet / 50 min) RG H
• USN 2008: (55 feet / 50 min) RG H
• DCIEM: (18 m / 50 min) RG F
• DECO 2000: (18 m / 45 min) RG F

  Q: decompression limit for 60 feet

  ndl for 18m; what is the no decompression limit for 18 meters; decompression limit for 18 meters in diving; nullzeitgrenze fuer18 meter
  A:
  => 60 feet / 18,2 m (--> 18 m resp. 21 m)
• PADI RDP: NDL 56 / 45 min
• USN old: NDL 60 / 50 min
• USN 2008: NDL 60 min
• DCIEM: NDL 50 min
• DECO 2000: NDL 45 / 31 min

  Q: 18m/60ft for 40 min

  A:
• PADI RDP: 41 min, RG P
• USN old: RG G
• USN 2008: 45 min, RG H
• DCIEM: RG E
• DECO 2000: 45 min, RG F

  Q: decompression time 65 feet x 65 minutes

  A:
  => 65 feet --> 70 feet / 21,3 --> 21 or 22 m
• PADI RDP: n.a.
• USN old: 70 feet, 70 min, RG L --> deco stop: 10 feet / 14 min
• USN 2008: 70 feet, 70 min, RG N --> deco stop: 20 feet / 24 min ( 13 min with 100 % O2)
• DCIEM: 70 feet, 70 min, RG J --> deco stops: 20 feet / 3 min + 10 feet / 19 min
• ZH-86: 21 m, 70 min: deco stop: 3 m / 24 min ( with the Buehlmann safety factor)
• DECO 2000: 21 m, 70 min, RG n.a. --> deco stop: 6 m / 5 min + 3 m / 16 min
• DECO 2000: 21 m, 70 min, RG n.a. --> deco stop: 6 m / 9 min + 3 m / 24 min (with the Buehlmann safety factor)

  Q: 40 mins at 20 m dive

  A:
• PADI RDP: RG R --> safety stop required
• USN old: 70 feet, RG H --> No Stop Dive
• USN 2008: 70 feet, 42 min, RG I --> No Stop Dive
• DCIEM: 21 m, RG F --> deco stop: 3 m / 5 min
• DECO 2000: 21 m, 41 min, RG F --> deco stop: 3 m / 5 min

  Q: max time for 20 meter dive rgbm

  A:
  assume: dive with AIR at SEA LEVEL
• 1) the table from RGBMdiving.com
• 60 feet: 55 min RGBM NDL
• 70 feet: 45 min RGBM NDL
• max. depth on 2nd. dive always: - 30 feet (MINUS 30 feet!)
• min. SI: + 3 h

• 2) the NAUI RGBM Air table:
• table entries: 70 feet / 21 m
• 1 st. dive: 40 min RGBM NDL
• 2 nd. dive: n.a. (max depth 50 feet / 15 m: 80 min RGBM NDL)
• 3 rd. dive: n.a. (max depth 30 feet / 9 m: 150 min RGBM NDL )
• min. SI: + 1 h!
• safety stops required at 15 feet +/- 3 feet for 3 min.

  Q: decompression stop after 16 minutes at 26 meters

  A:
  no deco stops required, safety stop recommended
• PADI RDP: --> 30 m, NDL 20 min
• NAUI RGBM: --> 27 m, Max Dive Time (MDT): 25 min
• USN old: --> 27 m, NDL: 30 min
• USN 2008: --> 28 m, NDL: 30 min
• DCIEM: --> 27 m, NDL: 20 min
• DECO 2000: --> 27 m, NDL: 18 min

  Q: 30 m no deco

  A:
  assume air, immediate descent
• PADI RDP: 20 min, safety stop required: 3 min @ 5 m
• USN old: 100 feet; 25 min
• USN 2008:100 feet; 25 min
• DCIEM: 15 min
• DECO 2000: 15 min
• RGBM: 20 min, safety stop required: 3 min @ 15 feet

  Q: NDL 30 m with EAN32, Nitrox 32

  A:
  assume SEA LEVEL, immediate descent
• Deco 92 EAN32: 24 min
• DECO 2000 (EAD @ 24 m): 23 min
• PADI RDP EAN 32: 30 min, safety stop required: 3 min @ 5 m
• NAUI EAN32: 30 min
• RGBM: 30 min, safety stop required: 3 min @ 15 feet, 2nd dive to only 21 m!

  Q: decompression obligation scuba 100 feet 60 minute

  A:
  assume AIR
• DECO 2000: n.a.
• ZH-86: 9 m/3 min, 6 m/13 min, 3 m/35 min
• DCIEM: 30 ft/6 min, 20 ft/9 min, 10 ft/43 min
• USN 2008: 20 ft/81 min

  Q: no deco time limit 28% at 130 ft

  A:
  assume 28% means EAN28
• for e.g. NOAA NITROX 28%: 15 min
• pls. cf. entry #[149], page A-4
• EAD = [ (1 - fO₂)/0.79) * (Depth + 33) ] - 33
• or any other AIR table, at EAD = 119 feet

  Q: 40 m NDL

  A:
  assume air, immediate descent
• PADI RDP: 9 min, safety stop required: 3 min @ 5 m
• USN old: 130 feet; 10 min
• USN 2008:130 feet; 10 min
• DCIEM: 39 m: 8 min; 42 m: 7 min
• DECO 2000: 39 m: 9 min; 42 m: 7 min
• RGBM: 10 min, safety stop required: 3 min @ 15 feet

  Q: air dive 43 m, 50 minute bottom time, water temperature 11 degree

  A: assume 45 m or 150 feet instead of 43 m due to cold water
  
• PADI RDP: n.a.
• USN old: 150 ft., 50 min; deco stops: 30 ft/12 min, 20 ft/23 min, 10 ft/51 min; TTS = 89 min
• USN 2008: 150 fsw, 50 min; descent rate = 75 fpm/23 m per min; deco stops: 50 ft/3 min, 40 ft/15 min, 30 ft/28 min, 20 ft/170 min; TTS = 220 min
• USN 2008: 150 fsw, 50 min; descent rate = 75 fpm/23 m per min; deco stops: 50 ft/3 min, 40 ft/15 min,
  in-water decompression with 100 % O₂: 30 ft/15 min, 20 ft/45 min; TTS = 88 min with in-water O₂
• DCIEM: 45 m, 50 min; deco stops: 15 m/6 min, 12 m/7 min, 9 m/8 min, 6 m/27 min, 3 m/73 min; TTS = 121 min
• ZH-86: table n.a., ends at 24 min
• DECO 2000: table n.a., ends at 22 min
• ZH-83 (predecessor of ZH-86); 45 m, 50 min; deco stops: 15 m/5 min, 12 m/7 min, 9 m/15 min, 6 m/27 min, 3 m/41 min; TTS = 98 min
• ZH-83 (predecessor of ZH-86); 45 m, 60 min; cold water correction;
  deco stops: 18 m/ 2 min, 15 m/6 min, 12 m/12 min, 9 m/20 min, 6 m/29 min, 3 m/50 min; TTS = 121 min
• ZH-86: computer simulation with DIVE V 2_99, 45 m with depth safety factor, 50 min;
  deco stops: 18 m/2 min, 15 m/7 min, 12 m/14 min, 9 m/21 min, 6 m/36 min, 3 m/68 min; TTS = 153 min
• DECO 2000: computer simulation with DIVE V 2_99, 45 m, 50 min;
  deco stops: 18 m/3 min, 15 m/10 min, 12 m/11 min, 9 m/14 min, 6 m/42 min, 3 m/101 min; TTS = 186 min

  Q: 15 mins @ 60 metres air

  A:
  assume: immediate descent, sea level
• PADI RDP: n.a.
• USN old: 200 ft., 15 min; deco stops: 30 ft/1 min, 20 ft/4 min, 10 ft/10 min; TTS = 19 min
• USN 2008: 200 fsw, 15 min; descent rate = 75 fpm/23 m per min; deco stops: 30 ft/2 min, 20 ft/22 min; TTS = 31 min
• DCIEM: 60 m, 15 min; deco stops: 12 m/5 min, 9 m/6 min, 6 m/8 min, 3 m/16 min; TTS = 35 + 6 min
• ZH-86: 60 m, 15 min; deco stops: 12 m/2 min, 9 m/4 min, 6 m/6 min, 3 m/15 min; TTS = 31 min
• DECO 2000: 60 m, 14 min; deco stops: 15 m/1 min, 12 m/2 min, 9 m/4 min, 6 m/6 min, 3 m/14 min; TTS = 32 min

  Q: 20 min @ 60m decompression air

  A:
  assume: immediate descent, sea level
• PADI RDP: n.a.
• DECO 2000: n.a.
• USN 2008: 200 fsw, 20 min; deco stops: 40 ft/5 min, 30 ft/6 min, 20 ft/43 min; TTS = 61 min
• DCIEM: 60 m, 20 min; deco stops: 15 m/5 min, 12 m/5 min, 9 m/6 min, 6 m/10 min, 3 m/33 min; TTS = 59 + 6 min
• ZH-86: 60 m, 21 min; deco stops: 15 m/3 min, 12 m/4 min, 9 m/6 min, 6 m/11 min, 3 m/28 min; TTS = 52 + 6 min

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  We are not quite sure, how to answer these ones competently: :-))

  --> "german" original:
  dekompresionszeit nach tauch ganz bei 60 m
  "english" version, correspondingly:
  decompresiontime after div whole with 60 m

  
  as well this one:
  --> "german" original:
  o2 verbrauch empirischer wert fick fΓΌr berechnung
  "english" version, correspondingly:
  o2 consumption empirical value fuck fΓΌr calculation

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