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  1. EFX

    Dive Calculation Spreadsheet

    Fixed it. Clicking on the link above will work.
  2. EFX

    Perdix CEIL, does it take into account the estimated off-gassing on ascent (with an assumed ascent rate)?

    I forgot about TTS (time to surface). Of course, an assumed ascent rate is needed to calculate the time it takes to get to the surface without exceeding GFHi. I was thinking only of the calculations for ceiling and NDL NDL doesn't need to predict the ascent rate because it is concerned solely...
  3. EFX

    Perdix CEIL, does it take into account the estimated off-gassing on ascent (with an assumed ascent rate)?

    That's correct. At the current time, there are no dive computer options you can download that mimic crystal balls.
  4. EFX

    Perdix CEIL, does it take into account the estimated off-gassing on ascent (with an assumed ascent rate)?

    The dive computer makes calculations based on the current conditions of your dive. No calculations are done based on assumed future data (i.e. ascent rates). The dive program is on a loop that repeats every second (this could be faster or slower on some computers). Every second, tissue...
  5. EFX

    Question Outdated training manuals

    When the group does a deco dive do you decide on a plan using the same algorithm or do you let each student follow their own plan using their own algorithm and settings?
  6. EFX

    Diving with gradient factors for a new recreational diver

    Is it monotonic or monotonous?! :)
  7. EFX

    Gradient Factors - What is Everyone Using?

    Well, because of the gravity of the situation it's all relative anyway.
  8. EFX

    Gradient Factors - What is Everyone Using?

    The faster TC's (tissue compartments) are already set for higher m-values throughout the entire dive. Take a look at the m-value tables for Buhlmann ZH-L16 in the paper "Understanding m-values" by Erik C. Baker, P.E.. Included are values for half-time (HT) and slope. Unless you're doing a very...
  9. EFX

    Gradient Factors - What is Everyone Using?

    For any change we make, especially a change made to the models, we have to ask: What benefit do we get out of it. Setting GF's for 16 tissue compartments makes things more complicated and may have unattended consequences for our safety. We already don't know exactly how conservative a dive will...
  10. EFX

    Swim-through or cave?

    This is the key answer. Personally, I will not go through any swim through restrictions that are over about 6 ft. unless my buddy(s) are on long hoses and everyone has discussed the hazard pre-dive.
  11. EFX

    Altitude questions

    I added the altitude capability to my spreadsheet. You can enter the final destination altitude and the time it takes to get there and it will happily calculate all the tissue compartment pressures, CurGF, SurGF, and more. It adds an altitude segment after the surface interval (air and O2 if...
  12. EFX

    Altitude questions

    I think the rule of "don't drive over a 5,000 ft mountain pass" after a dive has to do with the lack of tracking the pressures in your tissues as you ascend the mountain. Whereas, on a dive at 7,000 ft altitude your dive computer is tracking your tissues and will adjust the NDL time accordingly...
  13. EFX

    Should I wear a snorkel or not

    Sorry, I wasn't clear. The last few sentences of my post above refer to people at the shore diving under a breaking wave to escape it, NOT scuba divers out at sea.
  14. EFX

    Should I wear a snorkel or not

    One more piece of information on waves I found fascinating. There are generally two types of waves: wind-driven and tsunamis. As indicated by the description wind-driven waves build up by the wind. You can always dive under these waves to calmer water below although for very large waves you may...
  15. EFX

    Question Calculate repetitive dive group with safety stop on O2

    The current version of my scuba dive excel spreadsheet allows entry of an altitude and all calculations will be based on using that altitude. It also supports two nitrox gasses for accelerated deco and breathing 100% O2 on the surface followed by an air surface interval if needed. Each dive...
  16. EFX

    Should I wear a snorkel or not

    The book I read is called "The Power of the Sea" by Bruce Parker a former chief scientist of the National Ocean Service. You can get it from Amazon. Another interesting fact regarding waves the book mentioned is their power. Wave power goes up by the fourth power of the height. For example...
  17. EFX

    Should I wear a snorkel or not

    I read in a book about the dangers of storms at sea. The research said that non-breaking waves (swells) can never capsize a boat no matter how large. However, waves that break will always capsize a boat if the wave height is as high or higher than the boat is long. Also mentioned were three...
  18. EFX

    No stop limit vs. No stop time remaining

    So, let's keep the conversation focused on the calculation of NDL. I'm currently diving at a depth of 60 ft. I glance at my computer to discover that my NDL is 30 minutes. At that point in time I have three options: (1) I can stay at the current depth, (2) I can go deeper, or (3) I can go...
  19. EFX

    No stop limit vs. No stop time remaining

    Yes. However, you must realize that you are applying a human trait to a computer program that cannot do any thinking. The dive program simply processes real-time data based on sensor input, stored dive profile parameters and past data. An assumption implies that there is a possibility of another...
  20. EFX

    Question NITROX (in less than 40 foot of water)

    Compare it to another analyzer known to be accurate.
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