 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
| HomeArticlesDiving DestinationsLearning Scuba DivingMarine LifeMiscellaneousDiscussion GroupsGeneralScuba EquipmentScuba LocationsAustralian ScubaUK ScubaDirectoryScuba Clubs |
Scuba Forum / General / July 2006TUSA IQ700 Dive Computer?
Hi All I have an IQ 700 Dive Computer and it has the worst manual I have ever seen! I have emailed TUSA to ask them if they have an updated manual (the one on the web site is the same as the awful boxed one). The manual contains numerous inaccuracies and omissions! Does anyone else have one of these dive computers who can explain the different modes to me? Cheers, Kulgan. > Does anyone else have one of these dive computers who can explain the > different modes to me? P.S. The manual can be found here http://www.tusa.com/PDFs/IQ700_manual.pdf Specifically: 1. I don't understand what the Gage mode is for - why would you use this rather than Dive Mode? 2. Why is there a Log mode and a Profile mode? What is the difference? Can anyone help??? Thanks, Kulgan. > Specifically: > > 1. I don't understand what the Gage mode is for - why would you use > this rather than Dive Mode? When you want a bottom timer and a depth guage, and only a bottom timer and a depth guage. When you are diving deco profiles, with some other gas on your person, Dive Mode doesn't do you any good at all. > When you want a bottom timer and a depth guage, and only a bottom timer > and a depth guage. When you are diving deco profiles, with some other > gas on your person, Dive Mode doesn't do you any good at all. Many thanks for your help on this. Just so I'm clear, am I right that this mode is for when you are doing an unusual dive that you can't program into the computer? The computer locks into this mode for 48 hours after activation, presumably because the unusual dive means that the computer cannot accurately calculate your Nitrogen retention etc. Thanks again for the help! Do you have any thoughts on the difference between Profile and Dive Log modes? Thanks, Kulgan. > Many thanks for your help on this. Just so I'm clear, am I right that > this mode is for when you are doing an unusual dive that you can't > program into the computer? You don't program dives into the computer... The computer calculates your nitrogen absorption of the various body tissue groups / compartments depending upon depth and time and determines a no decompression limit from there... For a square profile, it probably doesn't make any real difference compared to using tables, but for profiles where you spend some time on the bottom and then work your way up, you get credit for the time you spent at shallower depths... Let's say you were doing a wall dive and it started at 20 ft and descended well past recreational depths... Let's say you dive for an hour, but you did a bounce dive to 150 ft... With the tables, you would have to calculate the entire 1 hour dive at 150 ft, whereas the computer is going to only count that time spent at the various depths that you visited... > You don't program dives into the computer... The computer calculates > your nitrogen absorption of the various body tissue groups / > compartments depending upon depth and time and determines a no > decompression limit from there... Correct in context, but it does not consider computers that allow you to set one or more gas mixes. Lee > Correct in context, but it does not consider computers that allow you to set > one or more gas mixes. Correct, but since he was asking about computers, I figured that he was just a beginning diver anyway and tailored my response to that... I didn't want to confuse him too much by bringing up tissue absorption rate models vs actual micro bubble formation... <grtin> > Many thanks for your help on this. Just so I'm clear, am I right that > this mode is for when you are doing an unusual dive that you can't > program into the computer? The computer locks into this mode for 48 > hours after activation, presumably because the unusual dive means that > the computer cannot accurately calculate your Nitrogen retention etc. Divers doing deep or long dives requiring decompression will use a decompression strategy that is far different from the one that the computer has. They will carry one or two extra gases to facilitate the decompression, and the computer in "dive mode" can't handle that. They will also use a bottom gas containing some helium, which has different absorption/elimination rates. The computer is not calculating your actual nitrogen absorption. It is running a mathematical model that approximates data obtained through observations, massaged for general using input from insurance companies. We know these models are not real. Hi Many thanks for everyone who replied to help me out on this. I am now a lot clearer! I'm still not sure about the difference between Dive Log and Dive Profile mode, so if anyone has any insight on this, that would be great! Thanks again, Kulgan. > I'm still not sure about the difference between Dive Log and Dive > Profile mode, so if anyone has any insight on this, that would be > great! Normally, the dive log mode gives you general information about the dive, things like what equipment you used, what your maximum and average depth was, what the temperature was, when you started and ended, etc. It's the kind of information you would fill out in a log you keep to record your dive history. Profile mode normally steps you through the dive, one time period at a time, telling you what your depth and, perhaps other things, were at each point during the dive. Some download programs combine the two in their printable output, recording all the basic stuff and giving you a graph of your profile. You can learn a lot about your diving from that kind of graph. Lee > Some download programs combine the two in their printable output, > recording all the basic stuff and giving you a graph of your profile. You > can learn a lot about your diving from that kind of graph. Download? Printable output? My Suunto gives me all that right on the face of the "watch". And it tells time real good too. >> Some download programs combine the two in their printable output, >> recording all the basic stuff and giving you a graph of your profile. >> You can learn a lot about your diving from that kind of graph. > Download? Printable output? My Suunto gives me all that right on the > face of the "watch". And it tells time real good too. Cool. If you could just get it to calculate MODs correctly and give you a more reasonable ND time, it would be an excellent computer. Rumor has it, the gauge mode is great. Lee Fully agreed, Greg! u2 a D9 or you a D6? Frank >> Some download programs combine the two in their printable output, >> recording all the basic stuff and giving you a graph of your profile. >> You can learn a lot about your diving from that kind of graph. > > Download? Printable output? My Suunto gives me all that right on the > face of the "watch". And it tells time real good too. > Fully agreed, Greg! > > u2 a D9 or you a D6? D9, natch. I do have to report that I didn't once get into deco on my last trip, 30 dives over 10 days. The trick is to stay real shallow. >> Fully agreed, Greg! >> >> u2 a D9 or you a D6? > > D9, natch. I do have to report that I didn't once get into deco on my last > trip, 30 dives over 10 days. The trick is to stay real shallow. Have you had the software updated in your D9 <http://www.suuntoservice.com/safetynotice/diving/> John >>> Fully agreed, Greg! >>> >>> u2 a D9 or you a D6? >> >> D9, natch. I do have to report that I didn't once get into deco on my >> last trip, 30 dives over 10 days. The trick is to stay real shallow. > Have you had the software updated in your D9 Naw. I got the notice less than a week before leaving on my last trip, so I brought a backup computer instead. I hope it doesn't make the Suunto even more conservative. > Divers doing deep or long dives requiring decompression will use a > decompression strategy that is far different from the one that the > computer has. They will carry one or two extra gases to facilitate the > decompression, and the computer in "dive mode" can't handle that. They > will also use a bottom gas containing some helium, which has different > absorption/elimination rates. My new one can. > The computer is not calculating your actual nitrogen absorption. It is > running a mathematical model that approximates data obtained through > observations, massaged for general using input from insurance companies. > We know these models are not real. Read Al's last sentence carefully. It's important. As he notes, what the computer tells you is not based entirely on what is happening during that dive. It's based on what a computer presumes is happening based on the items it measures. Not all computers measure the same things and not all of them use everything they measure in their calculations. Computers give you a best guess, usually a pretty conservative best guess, as to what is going on. While they have proven quite reliable at keeping divers from getting bent, then have been exceptions. Don't push your luck too far. Lee > > Divers doing deep or long dives requiring decompression will use a > > decompression strategy that is far different from the one that the [quoted text clipped - 4 lines] > > My new one can. Divers doing deep or long dives requiring decompression will use a decompression strategy that is far different from the one that the computer has. ;-) Ask George M about trimix computers. > Read Al's last sentence carefully. It's important. As he notes, what the > computer tells you is not based entirely on what is happening during that > dive. It's based on what a computer presumes is happening based on the > items it measures. Not all computers measure the same things and not all of > them use everything they measure in their calculations. What I'm saying is that many of us believe that there is strong empirical and theoretical evidence that the Buhlmann model that is used in your computer and much of the planning software in use is flawed, especially for helium. The VPM is better, but not perfect either. > What I'm saying is that many of us believe that there is strong > empirical and theoretical evidence that the Buhlmann model that is used > in your computer and much of the planning software in use is flawed, > especially for helium. The VPM is better, but not perfect either. Until they can plug sensors into your blood stream and take real time measurements, no model will be perfect. No model *can* be perfect. It can be more or less accurate, though. > Until they can plug sensors into your blood stream and take real time > measurements, no model will be perfect. No model *can* be perfect. > It can be more or less accurate, though. Wouldn't they need to have the sensors in various other parts of your body since not all the parts off-gas at the same rate? > Wouldn't they need to have the sensors in various other parts of your > body since not all the parts off-gas at the same rate? Yeah, sure. I guess. They'd also need a Mr. Fusion and a flux capacitor, and they'd have to bounce the photon beam off the main deflector dish. (Don't worry boys, we're making sh.t up as we wish...) >> Wouldn't they need to have the sensors in various other parts of your >> body since not all the parts off-gas at the same rate? [quoted text clipped - 4 lines] > bounce the photon beam off the main deflector dish. (Don't worry boys, > we're making sh.t up as we wish...) Cochran is supposed to have its new flux capacitor computer ready by mid-2008, after they release the HUD mask. >> 1. I don't understand what the Gage mode is for - why would you use >> this rather than Dive Mode? > > When you want a bottom timer and a depth guage, and only a bottom timer > and a depth guage. When you are diving deco profiles, with some other > gas on your person, Dive Mode doesn't do you any good at all. Again, this does not consider computers that can handle multiple gas dives, as a few of them can. It also does not address the fact that almost all computers that have a gage, or gauge mode, will work in that mode to depths well beyond what their dive mode is designed to handle. A use of gage mode that I didn't see mentioned, is the recording of the dive for subsequent download when the planned profile is inconsistent with what the computer can handle. Lee Indeed, Lee, Dive Mode usually handles dives to maximum the "recreational" depths (30m, 40m, very little even up to 48m or 50m) where their gauge mode goes untill the max depth rating (mine Suunto D9 200 meters!) Frank >>> 1. I don't understand what the Gage mode is for - why would you use >>> this rather than Dive Mode? [quoted text clipped - 15 lines] > > Lee > Again, this does not consider computers that can handle multiple gas dives, > as a few of them can. There is a reason this does not consider computers that can handle multiple gas dives, Lee. He didn't ask about one. It's right up there in the title, so that's how I know. Please to be not confusing the new guys, eh? The least you could do is call him an a.shole, first. >> Again, this does not consider computers that can handle multiple gas >> dives, [quoted text clipped - 6 lines] > Please to be not confusing the new guys, eh? The least you could do > is call him an a.shole, first. He hasn't been around long enough to earn the title. Lee |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.