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----- Original Message ----- From: "Don Burke" <donburke56@ne*.ne*> To: <techdiver@aquanaut.com> Sent: Thursday, May 24, 2001 2:57 AM Subject: Re: rockin' & reelin' <snip> | | For the second question, I ascend. Screw the line, that's what a knife is | for. So now you have to remark the line? or bin the whole line? as the markings are now out of calibration? - I just see all this line marking as a convolution and a source of confusion. <snip> | | How about if I find four interesting objects about 150 feet off the wreck on | various bearings? With less than 20 feet of vis and any current at all, | that can get pretty complicated. | yes, the distance line would be used - but I would know how long it took to get out there & hence back. If we couldn't get back to the wreck for what ever reason, cut the line & ascend. In this case use the spool & DSMB (Plus buddy has a DSMB to) | In any case, I don't remember the last time I made a dive where gas pressure | was useful for navigation. I may never have made one. The cavers may do it | all the time. | Navigate by pilotage & compass - the turn pressure is just that & do reciprocal bearing/direction | Now I _really_ don't like it. One of the things I want is a "gofer", not | someone on the same profile as I am. huh? I *always* want someone on the same profile as I am + next to me. We don't do 'same ocean Buddy' over here. <snip> | | Didn't you _just_ lose three people wreck diving in the Firth of Forth? Can't comment as I don't know the circumstances - what happened? <snip> | All the captains I have gone with can hook a wreck with someone on the bow | to tend the anchor. I've never seen a boat over about 25 feet where the | captain can set an anchor for safe diving by himself. I've had anchors slip | too many times to bet my life on one. They often take a chunk of wreck with | them. | We don't anchor to the wrecks. We have (usually) a large weight, which is precisely dropped on to the wreck, allowing for the tide. Our Skippers pride themselves on getting the part of the wreck the divers want to explore. You can see the line on a good color sounder, going down onto the wreck. The line has a large bouy & a trailing smaller bouy (the size of a soccer ball) so that the direction & strength of the tide can be determined. Even though the rough time of slack water is known, this is still only a prediction. A skillful Skipper will 'shot' the wreck & estimate the exact time of slack water - the smaller bouy usually gets dragged under due to the tide. When it resurfaces, it is safe to dive. We usually only get a tidal 'slack' window of around 30 minutes in the English channel - sometimes a bit more on a neap tide & sometimes less or no slack on a spring. <snip> | | That must be a heck of a boat. If I'm too heavy for the ladder, I tie off | some stuff and get it later. If the boat is about to leave, there are | plenty of people standing around to help since they want to go to. The | stuff can sit on the deck while I get a little breather. | | Don The boat is 16' x 42' shown in the picture (with the hydraulic elevator) http://www.wdi.co.uk/divetime/htm/mainframes.htm & is one of the most popular in the UK. 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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