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Pardon me for answering a post directed at George. With a primary and chase boat, the primary is just there for comfort/transport, and so if feasible may anchor on site. Chase boat is live, as would be a single vessel operating without a chase boat. The live boat follows the bag(s) of the ascending divers and carries the support diver(s). If you use an upline and get blown off with an anchored boat you are screwed. If the anchor drags and the boat crew is repositioning or recovering the anchor, and you have a problem, you are screwed. To plan these dives properly you need to keep the number of divers in the water to a minimum, and you need to schedule teams in and out in such a manner as to stagger the entries and exits, but plan your bottom times and entry times so that teams are exiting in short sequence. This makes it easier for the chase boat to manage support divers. Physical exertion of any sort, including struggling to maintain attitude and position during a hang on a line is a bad idea. Deco becomes less effective and you raise your chance of a DCS hit. By doing a drifting deco, you put the divers exertion level at essentially zero. This is especially important with a heavy sea on shallow stops. Also, a line tied to a wreck that is oscillating with a heavy sea above is likely to be severed by abrasion. As for the ships, this is the chase boat's (or single live vessel) responsibility, to either deter traffic or put safety divers in the water to make sure everyone is deep enough while the vessel passes. When a bag is located by the boat, surface personnel may elect to improve visibility by attaching a large scotson or other float to the ascent line. This is usually only necessary when there has been a change of conditions during the dive. -Sean On Sun, 29 Aug 1999 11:50:19 -0400, Paltz, Art wrote: >George, deep breathes! > >Drifting down by you is fine when you're drifting along a 100 mile long >wall. The current takes you along it. You're probably scootering cause >you're traveling a great distance too in a strong current. We're talking >about staying within a confined area when a current may be present. You're >group of divers pretty much stays in the same area cause the current is >pushing you along. Many people up here don't use scooters for traveling >because the wrecks are only so big. You can use one to swim to a spot then >drop it but personally I usually just swim the couple hundred feet to were I >want to be and leave the scooter on the boat. I usually go slow since I'm >looking for things > >Are you trying to say on a wreck where the wreckage is say within an 800 by >75 foot area that it's best to drop the divers in and have the boat drift at >a distance keeping relatively close waiting for divers to pop up? Can we >please stay focused here? We're not talking about reefs in the NE, we just >don't have them. We have wrecks that are finite areas on a desert of sand >(or mud) at the bottom of a vast ocean. > >I apologize to having to re-ask the question but I just can't seem to follow >your line of thinking. We're talking wreck diving here, not drift diving. > >When you wreck dive down there, does the boat anchor in? >Do any of the people come up the anchor line or an ascent line? > >We're not talking about teaching navigation here so please let's not talk >about this subject. What should you do if you are nowhere near the anchor >line and need to start your ascent? If the boat is drifting then I guess I >can see your point or drifting while ascending. Odds are the boat and >divers are all moving at relatively the same rate. If the boat is anchored >then I'm missing why ascending while drifting is safer than ascending on an >up-line of some kind. > >We need to stick to the questions asked and stop rattling and ranting. I >really want to understand this as I'm sure others do too. You're talking >like we're mind readers. Please try and make your points and stop with the >bashing. No one here has made any mention about Air diving, decompressing >on 80/20, etc. Why do you bring it up? Seems just another chance for you >to rant about this. Although this is a very good topic to cover it's just a >little difficult to follow the main topic when you're jumping all over the >place and calling names. > >If we are to learn anything we need to stick to one topic and solve that >first before moving on. > >Art. >P.S. Simply stating someone is wrong or calling them a stroke is not an >answer to the question at hand. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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