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It also dose not take much experience, (big word here on this list) to look at your reel and get an approximate of how much is out, depth is what your bottom timer tells you, line out can only tell you only the scope of the current, that your both moving in. Paul Komrowski -----Original Message----- From: Don Burke [mailto:donburke56@ne*.ne*] Sent: Wednesday, May 23, 2001 1:17 PM To: techdiver@aquanaut.com Subject: Re: rockin' & reelin' From: Dave Robbins <dir@Po*.co*> > In the UK, we use Delayed Surface Marker Bouys (DSMB) all the time. > What you will find, is once the bouy is deployed, the line will go out at an angle - often about 20 degrees in tide (we always have *some* tide during deco) > All these knots and pretty stripes will be meaningless to some degree if the bag is at an angle (even with zero tide there will be surface wind, which will pull the bag away from the diver). If I'm hanging off a bag, I'm probably drifting, which means I either didn't make it to the wreck or somehow got lost on the bottom. In such a case there would be no problem with being attached to the bottom, so no problem with relative current. If I'm hooked to a wreck, I must have seen it and seeing my depth guage is unlikely to be a problem. If my depth guage has failed and my buddy's has failed, an unmarked line won't be any more meaningful than a marked line. My trig isn't too bad and I can remember the cosine curve well enough to get by. It's not like I'd have something else to do. :) > The 6m (20 foot) marker will be useful, but the 21m (70 foot) will be too far out to be useful. The real reason for the markings is to measure horizontal distances on or near the bottom. In this neck of the woods (Norfolk, VA area), sorting through debris fields at much less than 100 feet in about 15 foot vis is quite common. I'd really like a decent system to figure out how far off the tie-in I am. The goal is to obtain said markings without reducing the line's utility as a safety device. If the utility of the line can be improved, I'm all for it. > why are you diving, if you can't see your gauges @ 70' ? The entering argument (for me) is that the dive didn't start that way. I only do braille dives on _very_ short profiles and only with a small objective. If you need a zero vis dive done to the point a deco obligation is involved, Ametek Straza makes some fairly good ROVs. Buy one with a good forward looking SONAR. I'll be going trout fishing that day and my cellphone will be turned off. I didn't bring up zero vis in this thread and I have been wondering how I would see my watch and pressure guages. I consider zero vis one of the "Chicken Little" factors in this discussion since I start thinking about what is for lunch if I hit the water and can't see my own fins. Cave divers may have a different opinion. Personally, I'm an incurable candyass about such things. > The other thing to consider, is that commonly, a red DSMB is used for a normal ascent. If the diver needs more gas, he would deploy a small yellow DSMB up the existing line. This would be attached with a double ender & slides up the line, so that there are now a red & yellow marker on the same line @ the surface. The skipper/captain is briefed to know that this signal means 'please drop a 6m/Oxygen bottle to me' > Knots in the line *could* jeopardise this vital safety system. I can't see myself using such a system. Why no support divers? As far as the scenario of drifting, lost, blind, low on gas with a deco obligation, no support divers, lost buddy, and a bum depth gauge goes, (or a combination of three or four of these things) perhaps the gene pool would be better off if I didn't survive a dive I planned so well. If I survived, the boat would probably get hit by a meteor anyway. :) Don NetZero Platinum No Banner Ads and Unlimited Access Sign Up Today - Only $9.95 per month! http://www.netzero.net -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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