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  1. K

    Question GF Low

    What makes you say there would be independent anchor depths per compartment?
  2. K

    Gradient Factors - What is Everyone Using?

    GF at surfacing is not really a measure of risk. It is simply the GF of the limiting compartment. That might be one fast compartment, with the rest way behind, for a short deep dive, falling quickly at the surface. At the end of a longer dive it would be one of many similar slow compartments...
  3. K

    ???Future of Open Circuit Mixed Gas and Rebreather Diving???

    Once you have been diving CCR for a while so that is second nature you might get away with big gaps between dives. However, if you never get fully practiced post qualification you will always be a bit uncomfortable and probably at increased risk. Also there is a high fixed cost of ownership...
  4. K

    Minimum Experience for Rebreather Training

    It is good for long dives too. Even in the 30-40m range a twinset can be the limiting factor, given you are prepared to do deco.
  5. K

    Is it possible to haul a single cylinder worth of scuba gear, suit included on a motorcycle. If so, has anyone ever done this?

    I have seen it done with a rebreather (basically sitting on the pillion seat) on a full size BMW. I can’t remember where he put the bailout.
  6. K

    Minimum Experience for Rebreather Training

    Using a rebreather involves quite a lot of extra hassle. Even keeping the kit current, cells expire, many more cylinders need to be o2 clean and in test, is a pain. Yesterday I was thinking “should I get this cylinder tested and so dump a load of trimix, or bet if I have to bailout (using that...
  7. K

    Rebreathers and Rotator cuffs

    I did something nasty to my shoulder stretching one morning. No impact or obvious injury but a scan showed inflammation internally in places it should not have been. To begin with I could not thread my own belt into my trousers. A load of work with a physio mostly fixed me. For a while I had...
  8. K

    How to differentiate muscle joint pain due to tiredness from being bent

    Get in a chamber. Does it stop hurting? Yes => bent, no => still not sure.
  9. K

    Apple Watch Ultra — what dive software is in the works?

    As we see from OrcasC205 export app that is not really a problem.
  10. K

    Trip to RSDS in October

    While I understand it is possible to get from Hurghada to Marsa Shagra I think you will find it takes quite a while. Marsa Alam airport is much closer If you can get a flight there. When I went in 2015 there was a transfer from the airport via a rickety old coach. The roads, coach etc are rather...
  11. K

    Difference between MB levels and Gradient Factors

    Maybe you should just tell the student that you are not an expert with their computer. Are you concerned that a fast ascent will mean the computer tells them not to dive for 24 hours? What do you usually teach students to do following a fast or uncontrolled ascent? “Go on O2 and monitor for...
  12. K

    Difference between MB levels and Gradient Factors

    On Friday I did a bunch of fast ascents from 6-8m teaching CBL (controlled buoyant lifts). The main way students (and instructors TBH) mess this up is by adding too much gas and not dumping soon enough, this can lead to less control than ideal and I was seeing 14-18 m/minute worst case. My...
  13. K

    Apple Watch Ultra — what dive software is in the works?

    They explicitly ask if the reason to get depth is for a scuba diving app.
  14. K

    Apple Watch Ultra — what dive software is in the works?

    I have had no reply after a couple of weeks. I have all the deco code done years ago as an exercise in understanding how GF works. I am not sure if what they are doing is altogether sensible as choosing “blessed” developers seems like a way to be responsible for blessing developers who have bugs.
  15. K

    Had my first student today

    I guess you must be a Rescue Diver. Rather than piss about in the DM/Instructor/Course Director pyramid scheme join a club and do the IFC Instructor Foundation Course (IFC) (next round starts in September Events). This skips being a dogs body for some dive shop and has a path to being able to...
  16. K

    Apple Watch Ultra — what dive software is in the works?

    This link is for support to read various sensors at quite a low level. That API is intended to be used by proper health data capture apps, probably as part of proper academic studies. Apple want to review the use of those APIs always due to privacy concerns. There is a completely different set...
  17. K

    New diver, looking at Suunto D5

    I am not sure what you are saying here so I will guess. The idea with dissolved gas models is not really that if you go past a limit there will be bubbles all of a sudden. The idea is that if you go past a limit you see a particular percentage of test subjects getting bent. For the application...
  18. K

    New diver, looking at Suunto D5

    It is pretty hard to express what sort of a **** you have to be to get locked out. Anyone that manages that is very unlikely to be competent to judge the extent of their mistake and know what sort of risk they run. The gauge mode switch lock out I agree is stupid.
  19. K

    New diver, looking at Suunto D5

    For the dissolved gas models, which these computers all are really, there are two things happening. The first is constantly calculating the actual gas tensions in the model’s compartments. The second is comparing those gas tensions with some limit. If you go over the limit then you can carry...
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