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help needed 2 years, 2 months ago #2328

  • frosty
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what is the minimum surface interval required between a dive to 20 meters/70 feet for 29 minutes followed by a dive to 14 m eters/50 feet for 39 minutes? minimum surface interval= ------- hope someone can help thanks
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Re:help needed 2 years, 2 months ago #2329

  • Wookie
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ok assuming you are using PADI RDPs you will get you dive groups of M for the first dive P for the secound which don't intersect on the surface interval chart so it'd be 0, but minimum surface interval according to PADI is 1 hour.

Is this part of actual planning or a question someone has given you as practice for OWD or something?
Last Edit: 2 years, 2 months ago by Wookie.
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Re:help needed 2 years, 2 months ago #2330

  • frosty
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hi wookie.its in the padi book chapter 5 i got the m and p but becaus they did not intersect i got confused your a real help thank you.
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Re:help needed 2 years, 2 months ago #2332

  • Wookie
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I've found PADI are really not very good with their questions/ reviews. I've found myself pulling my hair out on a few occasions with their structure or choice of wording. It does get you questioning yourself when you do know the answer..

Good luck with the rest of it
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Re:help needed 2 years, 2 months ago #2333

There is no minimum surface interval required. You do however need to ensure you do a 3 minute @ 5metres safety stop as you'll come within 3 pressure groups of a no decompression limit. Used PADI eRDPml to calculate the above.
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Re:help needed 2 years, 2 months ago #2334

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yes you're right ninja_wolf1, PADI doesn't say the min hour in that case sorry. Just a precautionary thing I've been taught else where..

The eRDP is a lot easier that the manual RDP tables isn't it? I was taught tables, but the Mrs got aways with the eRDP calculator
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Re:help needed 2 years, 2 months ago #2335

Never ever used the RDP but used the ErdpML for my DM recently and would swear by it. Intuitive and I picked it up in 10 mins and not having used it for 3 months used it again today with no problem. Has to be a sign of how easy it is as I'm thick
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