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Another wireless transmitter mounting question...

Discussion in 'Shearwater Research' started by BoatingDave, Jan 12, 2019.

  1. ChuckP

    ChuckP Barracuda

    # of Dives: 200 - 499
    Location: Cozumel
    461
    264
    63
    Transmitter fails - dive over. You should be on the boat with 500psi, a failure at anytime in your dive is no emergency, you simply end the dive even completing the safety stop.

    Computer failure with repetitive diving is either go back to tables or stay out of the water for 24hrs....

    This is recreational diving - no decompression. Back mount doubles for technical diving, with a reg failure, you shut that side down and call the dive - one SPG or AI is all they ask for - it could possibly be on the reg that fails hence you don't know gas remaining...

    A computer or AI failure is not an emergency nor a dive day ending event, they're failures of convenience. I personally feel more convenient recreational diving as streamlined as possible, I carry the bare minimum for the environment that I'm in - to each their own.

    I wear computer on the left, AI on the left - at times I'll tuck my hands in my waist strap for long periods of time, I'd guess that's when I've had drop out - again, it's happened a few times and comes right back - situational awareness helps realize it's not a big deal.
     
  2. Larryjd1

    Larryjd1 Angel Fish

    # of Dives: 200 - 499
    Location: In my crease or underwater in Northern California
    44
    33
    18
    I've never used an air integrated (AI) computer, but I am considering doing so for the benefits of having all of your info in one place, consumption calculations and more detailed history.

    However, if you have an SPG in addition to your transmitter, why would your dive be over if the transmitter failed? Wouldn't, say a Perdix AI or Teric, perform the deco calculations correctly anyway - or is there something I am missing here when using AI?
     
  3. scubadada

    scubadada Diver Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Philadelphia and Boynton Beach
    10,147
    5,442
    113
    @ChuckP

    My individual dives and series appear to be more important to me than to you.

    Good diving, Craig
     
  4. ChuckP

    ChuckP Barracuda

    # of Dives: 200 - 499
    Location: Cozumel
    461
    264
    63
    You are correct - dive continues on if you do have that back up. The AI does nothing for the NDL portion, depth etc of what the computer is telling you. Some computers will tell you total time to surface which takes into account gas being used and remaining but that is purely fluff...

    I'm just saying transmitter failure appears to be extremely rare, drop out for short times not so rare but manageable.
     
  5. scubadada

    scubadada Diver Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Philadelphia and Boynton Beach
    10,147
    5,442
    113
    Hi @ChuckP

    Your relative lack of experience betrays you
     
    caruso likes this.
  6. ChuckP

    ChuckP Barracuda

    # of Dives: 200 - 499
    Location: Cozumel
    461
    264
    63
    Don't know about that, I track, chart, look at review - all of that and some. One dive isn't a big enough deal for me though.

    Don't tell anyone - I use a Scubapro of Death G2 AI on the left and for the last 30 dives or so, a Peridix AI on the right - I'm trying to compare where things are at between the two - I wish G2 tracked NDL and I really wished I could log both computers in one software and do some overlaps.......

    There's hundreds of ways to dive, do what you enjoy!
     
  7. scubadada

    scubadada Diver Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Philadelphia and Boynton Beach
    10,147
    5,442
    113
    I dive an Oceanic VT3 running DSAT and a Dive Rite Nitek Q running Buhlmann ZH-L16C with GF, I can relate.
     
  8. caruso

    caruso Banned

    # of Dives: 200 - 499
    Location: Long Island, NY
    1,663
    1,184
    113
    That's the whole point of the SPG. If the transmitter fails, the dive isn't over because you've got the gas monitoring redundancy.

    I carry a primary AI, an spg, and a second AI. No lost dives for me.
     
  9. tbone1004

    tbone1004 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    15,367
    6,681
    113
    I have transmitters on both sides of my CCR rack *independent doubles*, and because I'm lazy usually have them both on the same set of doubles since those regulators do double duty.
    Arguably worse for transmitter dropout than on a single tank reg because the line of sight is worse when crossing. I have no transmission issues. The only time it has dropped out was when the batteries were very low on the transmitters. It would drop out when my arms were down, and I reached back towards my ear for ~5 seconds and it would pick it back up. No issues.
    I do not dive with a SPG when I am using transmitters. Huge increase in failure points for leaks *HP spools are the worst culprits*, and while it's not a major failure, it's an annoying one. I leave the SPG on the boat just in case.

    If the transmitter dies dies *which I haven't personally experienced*, the dive is over. If the dive is critical to complete, then you aren't going to be diving without other sorts of redundancy anyway, i.e. doubles or sidemount.

    IF you are an experienced diver, IF you have very consistent consumption, and IF you did your dive planning properly, you can finish most dives without a SPG at all. Hell it was done that way for decades. You have depth, air, and time limits for your dive. Your time limit is either going to be determined by your air limits or NDL limit. If limited by NDL, you should have written down the amount of gas that you "should" be back with. If that is say 1000psi, I would just finish the dive on that time limit. If your dive is limited by gas and you have it planned to be back on the boat with say 500psi which is 13cf in an AL80, you know that your SAC is on average 0.7cfm and you're diving at 70ft, you can do some quick mental math and say that you're going to consume around 2.5cfm at depth and if you cut your dive time by 5 minutes, then you should be back on the boat with around 1000psi. Cut your dive short by 4 minutes, or start heading to the surface 4 minutes early, and happy days.
    What is absolutely critical with this is that you know all of this information and did proper dive planning. I know for a fact that most instructor trainers are unable to do this, so it is never something that I would recommend to someone, but that is what I have as a contingency plan.
     
  10. scubadada

    scubadada Diver Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Philadelphia and Boynton Beach
    10,147
    5,442
    113
    It's interesting that, not too long ago, AI was nearly unacceptable, things have certainly changed.
     
    Compressor likes this.

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