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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). The 6m (20 foot) marker will be useful, but the 21m (70 foot) will be too far out to be useful. why are you diving, if you can't see your gauges @ 70' ? 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. best, Dave On Tue, 22 May 2001, "Don Burke" wrote: > > From: Jim Cobb > > > > I'm not so sure about the knots, Don. > > Me neither. There are some ways to put a detectable bulge in a line while > not presenting much of a snag hazard and I'll try as many as I can. Having > never shot a bag using a line with knots in it, I see a trip to Rawlings in > my near future to try this out. I won't be hitting the ocean for a couple > of weeks due to the job. > > > If you do this make sure you bring a knot-free spool or reel for shooting > a lift bag. > > If I can't make the backup reel go without snags, it will be without knots. > > > I guarantee that the knots will snag on a deployment. > > Figure-eights normally behave themselves under most conditions. However, it > is entirely possible that I'll end up with Dacron markers in the line. I'll > let you know how it works out. > > 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'. regards, Dave -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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