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Scuba Forum / General / May 2006Logging total bottom time in your log book
I am new the sport of diving and for that matter discussion groups, as this will be my first. Is total bottom time also kept as a running total (like logging flight hours) or does it go back to zero after SIT of 12 hours or more? >I am new the sport of diving and for that matter discussion groups, as this > will be my first. Is total bottom time also kept as a running total (like > logging flight hours) or does it go back to zero after SIT of 12 hours or > more? Total bottom time is for bragging purposes only. > Total bottom time is for bragging purposes only. I'd agree "98%", with a smallish exception of when you're first starting out. I think that its generally useful to keep track of Total Bottom Time (TBT) as a tool to remind you how little real time you've spent doing diving. The problem is that "a day's worth of bottom time" sounds like a lot until we remember that a generic 3 credit educational class is ~3 hours/week for 15 week semester = 45 hours, and that's just for one class. It takes a lot of days of diving to get more hours of practice than just what most people got playing Dodgeball in Middle/High School :-) -hh > I think that its generally useful to keep track of Total Bottom Time > (TBT) as a tool to remind you how little real time you've spent doing [quoted text clipped - 7 lines] > It takes a lot of days of diving to get more hours of practice than > just what most people got playing Dodgeball in Middle/High School :-) Totally agree with this. Dive count falls into place with this idea. Easy example, this morning, did a single dive at the "local" hole in the ground. Compared to 8 years ago, when I did 4 dives in the same place in a day. Spent more time in the bottom chamber than I did in all 4 dives years ago, only difference I see is I got more experience back then doing "touch & goes", descents & acsents. Today, just did a little deco, and as a side note, used half the gas (one set dub AL80s vs 4 AL80s). Doing fewer dives a year, but a hell of a lot more time actually where I wanna be, and less time percentagee wise in deco than used to spend in "transit". (Wonder if we can convince SW into one longer dive Lee?) <grin> Curtis > (Wonder if we can convince SW into one longer dive Lee?) Hell, I got the double 120s and can put an AL80 on each side... I'm game... >> (Wonder if we can convince SW into one longer dive Lee?) > > Hell, I got the double 120s and can put an AL80 on each side... I'm > game... Damn, wasn't trying for MJBs bottom time record.......has he stopped logging yet? Curtis >>> (Wonder if we can convince SW into one longer dive Lee?) >> [quoted text clipped - 3 lines] > Damn, wasn't trying for MJBs bottom time record.......has he stopped > logging yet? Let's not get Francis's panties awedge.  SignaturePopeye "If one does as God does enough times, one will become as God is." -Dr. Hannibal Lector. www.finalprotectivefire.com ""Magilla"" wrote > Spent more time in the bottom chamber than I did in all 4 dives years ago, > only difference I see is I got more experience back then doing "touch & > goes", descents & acsents. There's something to be said for number of dives. A large number does several things that a single, longer one doesn't. Perhaps the most important is that it gives experience in planning and executing the dive, everything from ensuring the equipment is there, to setting it up, to cleaning it after the dive. It also gives a relatively new diver the chance to make small mistakes that they learn from instead of one big one with results they are not around to learn from. A nice benefit is that a lot of dives tends to give a diver exposure to a lot of people and an opportunity to learn from their mistakes instead of making all of them personally. The same thing goes for exposure to a lot of places. Of course, it also tends to keep newer divers out of deco until they're ready to add that risk to the ones they've learned to deal with over the years. > Today, just did a little deco, and as a side note, used half the gas (one > set dub AL80s vs 4 AL80s). Doing fewer dives a year, but a hell of a lot > more time actually where I wanna be, and less time percentagee wise in > deco than used to spend in "transit". I find it odd that you think you used to spend a higher percentage of your time in transit. Your transit time, these days, is certainly slower than it used to be, even without the deco stops along the way. One of the many things we live long enough to learn is that ascending slower than your bubbles may not always be enough. Deco time tends to increase faster than bottom time increases as slower tissues become more saturated. I would think the proportional time spend in deco and ascent would be considerably greater. On the other hand, being able to spend more continuous time at your desired depth certainly gives you a chance to do things that would not be possible otherwise. > (Wonder if we can convince SW into one longer dive Lee?) <grin> I doubt it. I'm sure you remember the PADI lecture we got the last time we visited them. This time, we won't have Ric's advanced warning that the crew should let us dive as we chose without too much interference. Regardless, I'm still not set up for really long dives. I'll take a small bottle of 50% with me, but more to facilitate the second dive than to extend the first. Lee > I find it odd that you think you used to spend a higher percentage of your > time in transit. Your transit time, these days, is certainly slower than it > used to be, even without the deco stops along the way. One of the many > things we live long enough to learn is that ascending slower than your > bubbles may not always be enough. I think that he's talking about transit time in a cave -- basically horizontal, not vertical... I think he's comparing the difference of making a couple of no-deco dive that did not allow him much time at the area of the cave in which he was interested vs a single, albeit longer, dive where he was able to spend more time in that section of the cave... He's saying the the sum of these transit times is more than the deco time he now does with a single dive in addition to being able to spend more time in that section of the cave... > I doubt it. I'm sure you remember the PADI lecture we got the last time we > visited them. This time, we won't have Ric's advanced warning that the crew > should let us dive as we chose without too much interference. Regardless, > I'm still not set up for really long dives. I'll take a small bottle of 50% > with me, but more to facilitate the second dive than to extend the first. Awh, 'ell Lee, a quick trip to Home Depot and we can rig you up some stage bottles... Hell, we might even be able to rig you up poor man's manifold with a short HP hose between two first stages for some back gas... A couple of beer cans for spacers between the tanks and we're ready to go... >> I doubt it. I'm sure you remember the PADI lecture we got the last time >> we [quoted text clipped - 5 lines] >> 50% >> with me, but more to facilitate the second dive than to extend the first. > Awh, 'ell Lee, a quick trip to Home Depot and we can rig you up some > stage bottles... Hell, we might even be able to rig you up poor man's > manifold with a short HP hose between two first stages for some back > gas... A couple of beer cans for spacers between the tanks and we're > ready to go... The setup issue is more me than the equipment. I can rent manifolded twins of any size I like and a bladder appropriate to the setup, have plenty of regulators sitting around and don't have to go anywhere for the hardware to rig stage bottles. I dive for fun and, for me, worrying about a lot of unfamiliar equipment handing all over me is not fun. I'll probably take the time to get comfortable with what it takes to carry more gas before I do the Oriskany, but am not likely to do so for a dive I am happy doing with equipment I'm familiar with already. Lee > There's something to be said for number of dives. A large number does > several things that a single, longer one doesn't. In the early stages, quite true. >> Today, just did a little deco, and as a side note, used half the gas (one >> set dub AL80s vs 4 AL80s). Doing fewer dives a year, but a hell of a lot [quoted text clipped - 4 lines] > time in transit. Your transit time, these days, is certainly slower than > it used to be, even without the deco stops along the way. Then, TDT was 120 min, yesterday, 62. Time at cork, then 20-24 min, yesterday 25 min. That meant about 96 to 100 min in transit. Yesterday did 7 minutes at 60 ffw, leaving 30 minutes in transit. So, comparing the 4 dives of years ago with the one dive of today, very easy to make the statement. I get considerably more time out of a bottle than I used to, so the early dives were very short. Also, the usage of better breathing mixtures and more aggressive tables lowers the time spent in deco, even with slower ascents. Add to that some planned multilevel diving, right about where a deep stop may have been. BTW, I was already doing deep stops & slow ascents then. >> (Wonder if we can convince SW into one longer dive Lee?) <grin> > > I doubt it. I'm sure you remember the PADI lecture we got the last time > we visited them. Yeah, but my PADI cards have expired....... Curtis >>I am new the sport of diving and for that matter discussion groups, as this >> will be my first. Is total bottom time also kept as a running total (like >> logging flight hours) or does it go back to zero after SIT of 12 hours or >> more? total bottom time is cumulative. >Total bottom time is for bragging purposes only. True. Signaturedillon I didn't climb to the top of the food chain to become a vegetartian. Residual Nitrogen Time in more important to me, sadly mine has been at 0:00 for way too long. >I am new the sport of diving and for that matter discussion groups, as this > will be my first. Is total bottom time also kept as a running total (like > logging flight hours) or does it go back to zero after SIT of 12 hours or > more? Some dive computers keep track of each dive, total time, and average dive time for however many dives you've logged. Those statistics, like the number of dives to a specified depth range or number in salt water or fresh water, are interesting to look back on and after enough dives will indicate your overall dive style. The total number of hours like the total number of dives is relevant only if you care about such things. It's your dive log and it's your information. Keep it in your log and later on you may be glad you did. >>I am new the sport of diving and for that matter discussion groups, as >>this [quoted text clipped - 11 lines] > It's your dive log and it's your information. Keep it in your log and > later on you may be glad you did. It's really valuable if you log faithfully, especially in the beginning. Helps know yoru time undewater, depth, weight, etc. I have been diving since 1998, and log every dive in my book. I think it is fun to go back and read the prior dives and my reactions. It is a good learning experience, and shows how you have matured as a diver, plus, i am a geek and also log where we dine, who we meet, etc. Some resorts will actually occasionally ask to see it for determination of your abilities. > I am new the sport of diving and for that matter discussion groups, as this > will be my first. Is total bottom time also kept as a running total (like > logging flight hours) or does it go back to zero after SIT of 12 hours or > more? Some of us got started before logging your dives was common... After I'd gone 20+ years without logging 'em, my attitude was basically, "why bother logging them now?"... Hell, I'm a pilot and I don't even log all my hours... >> I am new the sport of diving and for that matter discussion groups, as >this [quoted text clipped - 5 lines] >gone 20+ years without logging 'em, my attitude was basically, "why bother >logging them now?"... Hell, I'm a pilot and I don't even log all my hours... Just log enough to be able to say "legal and current". Signaturedillon I didn't climb to the top of the food chain to become a vegetartian. On Sun, 30 Apr 2006 15:16:48 -0500, Dillon Pyron >Just log enough to be able to say "legal and current". Hell, I usually fly solo, so even that is not that much of an issue for me... > I am new the sport of diving and for that matter discussion groups, as this > will be my first. Is total bottom time also kept as a running total (like > logging flight hours) or does it go back to zero after SIT of 12 hours or > more? A running total is probably what was intended. I never bothered with "total bottom time", but I find it useful and enjoyable looking back occasionally on other info I've logged over ten years of diving, especially specifics about headings, current, tide, temp, thermoclines, vis, critters seen, items salvaged, and any changes in gear configuration and effect, and any problems encountered, etc. One suggestion is to log info that helps you become a better diver, such as how you handled any problems encountered. It's purely personal, though. Like family photo's, reviewing your dive log with somebody will go over like a wet fart! 8^) Dave C scubacowboy wrote: > I am new the sport of diving and for that matter discussion groups, as > this > will be my first. Is total bottom time also kept as a running total (like > logging flight hours) or does it go back to zero after SIT of 12 hours or > more? Depends on what you want to record. Your log is yours. It is a record of your diving and, if you do it right, a series of stories to remind you, in later years, of things you did when you were younger. For the most part, those, other than you, who will ever care about your log want to know one or more of the following: Whether you've done a lot or only a few dives. Whether you've been diving recently. Whether you're competent to do the kind of dives you're planning. > It's purely personal, though. Like family photo's, reviewing your dive > log with somebody will go over like a wet fart! 8^) Unless you include photos as well. It can be as dull or as interesting as you chose to make it. Lee >I am new the sport of diving and for that matter discussion groups, as this > will be my first. Is total bottom time also kept as a running total (like > logging flight hours) or does it go back to zero after SIT of 12 hours or > more? There's log books fer diving??? Limey. |
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