For the math behind deco check out the links I just put up with Eric Bakers
stuff. The Fortran source code is there if you are really into it.

Tables software is a tool. You give a guy a set of building plans, this does
not make him a carpenter. You give a guy a deco software this does not make
him a tech diver.

But looking at the plans and studying them carefully can give you insight as
to how a house is built. Running tables on a deco planner can give you
insight on how deco works.

Sure you can learn the math and the egg-head theory but why waste the time.
Get Decoplanner and do hypothetical dives. Read Eric Bakers stuff (which
while quite interesting is way over my head) if you wish.

What I like to do on deco planner is do a range plan and study it, you can
see the trends and extrapolate in your head what the deco should be between
a set of bottom times quite easily without needing to do mathematical
calculations in your head. Trust me, you will have plenty of other things
which will need your full and undivided attention during your dive.

   Jim

 -------------------------------------------------------------------
 Learn About Trimix at http://www.cisatlantic.com/trimix/

> From: Steve <sfkenney@ea*.ne*>
> Date: Thu, 31 May 2001 23:45:51 -0700
> To: Jim Cobb <Cobber@ci*.co*>, Z <mzurl@be*.ne*>, Fltechdiver
> <fltechdiver@mikey.net>, Tech Diver <techdiver@aquanaut.com>
> Subject: Re: TriMix Computer Vote RESULTS
> 
> 
> "learning deco so that one does not need a computer or tables,"
> 
> I didn't just pull this one out of my hat, this is advocated by a respected
> diver. This is the way I want to conduct my helium deco dives. Bottom timer,
> depth gauge and the knowledge. My diving is easy to manage 10-40 minutes
> bottom time and not very deep. If I keep my EAD to less than 100' and O2
> less than 1.4 then managing the helium slow ascents and extra stops is the
> next step. I don't want to learn the lazy way with a laptop and deco
> software to cut tables. I want to know the math behind the theory. I will
> check into those books you mention. Thanks for the advise.
> 
> Steve
> 
> on 5/31/01 8:57 AM, Jim Cobb at Cobber@ci*.co* wrote:
> 
>> Steve-
>> 
>> Thanks for the complements o
> 
>> n the website, I appreciate it. You need to read
>> it a  bit more carefully, however, as the answers to your questions are
>> contained within the web site.
>> 
>> I am also concerned at your self-imposed 150' air limit, I think that an EAD
>> of 100 is a bit more appropriate. From the general tone of your post I think
>> that perhaps you may need a few more dives under your belt and perhaps some
>> training and/or tutelage on the practice of Deco diving.
>> 
>> You don't really "learn" helium, all He does is make your dive safer. What
>> you
>> really need to be very good at before you do serious Deco diving is gas
>> management, Deco bottle preparation and utilization. You really need to be
>> perfectly comfortable under water in all conditions and not have any
>> tendencies to stress out when problem arise, and indeed problems *will* arise
>> sooner or later.
>> 
>> You also need to make sure your gear is squared away, no stupid bullshit like
>> OMS stuporwings, steel stages, suicide clips, convoluted hose routing etc.
>> Use
>> DIR guidelines (www.gue.com) and don't listen to the "old school" techdivers,
>> there are currently better ways to do things which are make techdiving more
>> survivable, particularly to the newbie.
>> 
>> Then dive your gear. Dive rec profiles with full doubles and stages and
>> practice, practice, practice. Helium is your friend, Oxygen is the thing to
>> worry about, it's the O2 that will kill you.
>> 
>> On the tables, it is insane to think that you can do gradient calculations in
>> your head, as one rocket scientist claimed he could do. After you do a whole
>> bunch of dives using a tables calculation program you begin to see trends on
>> how your particular Deco profile shapes up.
> 
>> Deco is not an exact science by any stretch of the imagination. A Deco
>> program
>> takes mathematical theories, various fudge factors and applies them to all
>> physiological types in all underwater situations. Wish things were that
>> simple.
>> 
>> Every individual is damaging his or her body to a certain extent when Deco
>> diving. You try to manage the damage, and the body repairs itself quite well
>> in most cases. As it is your body only you can tell when your profile is not
>> quite right and you need adjust appropriately. And you gain this knowledge
>> through experience and research. It is your ass.
>> 
>> So go back to the drawing board, Steve, and read my website, the books I
>> mention, Techdiver archives and anything else you can get your hands on
>> concerning Deco theory and practice, practice, practice.
>> 
>> Jim
>> 
>> On Thursday, May 31, 2001 12:40 AM, Steve <sfkenney@ea*.ne*> wrote:
>>> I take it you are the webmaster on the trimix site? Very good work BTW, it's
>>> a home mixers dream come true. I would like to try some helium diving this
>>> year. I'm somewhat concerned about the side effects, stiff joints flu like
>>> symptoms, problems from rapid ascents. Why do you need to make slow descents
>>> when using helium? With all the talk about the danger of deep air, I've set
>>> my limit at 150'. I want to learn to dive helium without computers and
>>> without cutting tables, just have the knowledge to calculate on the fly as I
>>> go.
>>> 
>>> Steve
>>> 
>>> 
>>> 
>>> on 5/28/01 5:25 PM, Jim Cobb at Cobber@ci*.co* wrote:
>>> 
>>>> Once you cut your tables you need to carry them down somehow. Some like to
>>>> tape them to flat plastic slates. Others combine a bottom timer to a
>>>> conformal
>>>> plastic slate. Mike Zurl contributed a nice page on how to make one where
>>>> you
>>>> don't need to use duct tape to write your numbers on.
>>>> 
>>>> Jim
>>>> 
>>>> On Sunday, May 27, 2001 10:42 PM, Steve <sfkenney@ea*.ne*> wrote:
>>>>> 
>>>>> Jim, what do you mean about your new wrist slate section? I'm not positive
>>>>> I
>>>>> want to get way into tech diving because I'm 48 years old but I do want to
>>>>> learn about it. Decompression theory is interesting and it's affects on
>>>>> the
>>>>> body is relevent to me even if I don't go real deep. I may decide down the
>>>>> road to volunteer for a recompression chamber.
>>>>> 
>>>>> 
>>>>> 1) Tables
>>>>> 2) No tables and no computer
>>>>> 3) Math equations??
>>>>> 4) Tabletop software programs
>>>>> 5) Wrist Computers
>>>>> by order of preference
>>>>> 
>>>>> Steve
>>>>> 
>>>>> on 5/27/01 10:35 AM, Jim Cobb at cobber@ci*.co* wrote:
>>>>> 
>>>>>> Get yourself a cheap laptop, Decoplanner from www.gue.com, see my new
>>>>>> wrist
>>>>>> slate section, purchase a uwatec bottom timer. Then take the $1000 you
>>>>>> save
>>>>>> and get yourself a proper set of wings, doubles and regs. If tech diving
>>>>>> is
>>>>>> what you want to get into, then you are all set. If you simply have to
>>>>>> get
>>>>>> a
>>>>>> computer for non-trimix deco dives then go for the DiveRite or Suunto
>>>>>> Viper
>>>>>> which has a gauge mode you can use for when you do the deep stuff.
>>>>>> 
>>>>>> Jim
>>>>>> -------------------------------------------------------------------
>>>>>> Learn About Trimix at http://www.cisatlantic.com/trimix/
>>>>>> 
>>>>>>> From: Steve <sfkenney@ea*.ne*>
>>>>>>> Date: Sun, 27 May 2001 09:43:57 -0700
>>>>>>> To: Jim Cobb <cobber@ci*.co*>, Z <mzurl@be*.ne*>,
>>>>>>> Fltechdiver
>>>>>>> <fltechdiver@mikey.net>, Tech Diver <techdiver@aquanaut.com>
>>>>>>> Subject: Re: TriMix Computer Vote RESULTS
>>>>>>> 
>>>>>>> I didn't see the post where I could vote on computers. I don't think I
>>>>>>> would
>>>>>>> buy one for $1900 unless I was a professional diver and they were proven
>>>>>>> to
>>>>>>> work well. Are there two brands on the market now, Dive-Rite and Abyss?
>>>>>>> I
>>>>>>> believe they monitor three gases and you can switch gas on the fly,
>>>>>>> sounds
>>>>>>> impressive.
>>>>>>> 
>>>>>>> What are the options for a beginner tech diver?
>>>>>>> 
>>>>>>> 1) Tables
>>>>>>> 2) Tabletop software programs
>>>>>>> 3) Wrist Computers
>>>>>>> 4) No tables and no computer
>>>>>>> 5) Math equations??
>>>>>>> 
>>>>>>> Steve Kenney
>>>>>>> 
>>>>>>> 
>>>>>>> 
>>>>>>> 
>>>>>>> on 5/25/01 3:54 PM, Jim Cobb at cobber@ci*.co* wrote:
>>>>>>> 
>>>>>>>> Yes, this vote shows that there are 21 IANTD instroketors on Mikey's
>>>>>>>> list
>>>>>>>> here and 4 normal people. This might explain why you boys seem to have
>>>>>>>> such
>>>>>>>> a hard time filling tech trips down there, not enough trimix
>>>>>>>> computers...
>>>>>>>> 
>>>>>>>> Anyway, moving right along...
>>>>>>>> 
>>>>>>>> -------------------------------------------------------------------
>>>>>>>> Learn About Trimix at http://www.cisatlantic.com/trimix/
>>>>>>>> 
>>>>>>>>> From: "Z" <mzurl@be*.ne*>
>>>>>>>>> Date: Fri, 25 May 2001 18:23:09 -0400
>>>>>>>>> To: "Fltechdiver" <fltechdiver@mikey.net>
>>>>>>>>> Subject: TriMix Computer Vote RESULTS
>>>>>>>>> 
>>>>>>>>> ALL -
>>>>>>>>> 
>>>>>>>>> At this time, it appears anyone who was going to vote did so.  As a
>>>>>>>>> result,
>>>>>>>>> I have decided to release the results of the first DeeperStuff
>>>>>>>>> Technical
>>>>>>>>> Dive Debate.
>>>>>>>>> 
>>>>>>>>> Question:
>>>>>>>>> Would you use a wrist-mounted TriMix computer?
>>>>>>>>> 
>>>>>>>>> RESULTS:
>>>>>>>>> 
>>>>>>>>> NO     4
>>>>>>>>> YES    21
>>>>>>>>> 
>>>>>>>>> YES BY A LANDSLIDE !!!
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> Z's Analysis:
>>>>>>>>> To some, it might appear that voter turnout was low. I believe this
>>>>>>>>> was
>>>>>>>>> due
>>>>>>>>> to a small population of trimix rated divers to begin with.  Since
>>>>>>>>> FLTechDiver is monitored by hundreds' I suspect many were afraid to
>>>>>>>>> vote
>>>>>>>>> due
>>>>>>>>> to their lack of experience in this area.  Although I will not divulge
>>>>>>>>> the
>>>>>>>>> names of those who voted, many are well respected "mix" divers, and at
>>>>>>>>> least
>>>>>>>>> a couple  admitted currently owning a "mix" computer.
>>>>>>>>> 
>>>>>>>>> I will admit the landslide surprised me.  I figured we were in for a
>>>>>>>>> much
>>>>>>>>> closer tally.  This also confirms what I have always believed, that
>>>>>>>>> many
>>>>>>>>> monitor these lists without voicing their opinion which is in direct
>>>>>>>>> contradiction to a few VERY vocal participants.
>>>>>>>>> 
>>>>>>>>> Someone asked me how I was going to vote.  For the record, I said
>>>>>>>>> "YES"
>>>>>>>>> (if
>>>>>>>>> I could find a mix computer I liked that is)!
>>>>>>>>> 
>>>>>>>>> Z
>>>>>>>>> www.deeperstuff.com
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> ============================================================
>>>>>>>>> To contact the list administrator, email
>>>>>>>>> Mike Rodriguez at mikey@mi*.ne*
>>>>>>>>> To UNSUBSCRIBE from this list, send a message to:
>>>>>>>>> listserv@mi*.ne*
>>>>>>>>> and in the *BODY* of the message type:
>>>>>>>>> unsubscribe FLTechDiver
>>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> --
>>>>>>>> Send mail for the `techdiver' mailing list to
>>>>>>>> `techdiver@aquanaut.com'..
>>>>>>>> Send subscribe/unsubscribe requests to
>>>>>>>> `techdiver-request@aquanaut.com'.
>>>>>>> 
>>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> --
>>>>>> Send mail for the `techdiver' mailing list to
>>>>>> `techdiver@aquanaut.com'....
>>>>>> Send subscribe/unsubscribe requests to
>>>>> `techdiver-request@aquanaut.com'.
>>>>> 
>>>>> 
>>>> 
>>>> 
>>> 
>>> 
>> 
>> 
>> --
>> Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
>> Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
> 
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