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SCUBA-L  February 2001, Week 2

SCUBA-L February 2001, Week 2

Subject:

Re: Reaching out for dive computer help!

From:

Paul Braunbehrens <[log in to unmask]>

Reply-To:

Scuba diving discussion list <[log in to unmask]>

Date:

Fri, 9 Feb 2001 15:23:55 -0800

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (105 lines)

The algorithms in the computer are based on certain things, such as a
slow ascent rate and safety stops.   If you don't do these things,
the computer starts to penalize you, and you are faced with less
bottom time and possibly longer safety stops on subsequent dives.  If
you don't want to have a computer control your diving, don't wear
one!  The whole point of the computer is that it keeps track of what
you do and keeps you within a certain level of risk.  This computer
allows you to specify 3 settings of "riskiness", so you can even
choose a fairly risky profile.  You don't have to do any safety
stops, and the computer gives you plenty of bottom time on the higher
risk setting.

The Vyper is the best computer out there right now, IMO, at least in
that price range.  It has a few minor flaws, they all do, but this is
not one of them.  The most glaring flaw is that if you hit the light
button, the light won't stay on for very long.  This makes it really
hard to do a slow ascent on a night dive.  The other flaw is that
when you change nitox percentages, the computer changes a half second
after you hit the button, so it's quite possible to hit the button a
bunch of times, to go from say 36% to 21%, and have it scroll past,
to 50%.  Because it takes a second for the computer to react, you
might think it's on 21%, and jump in the water.  Once the computer
submerges, you can't change the mix.  All you can do is go to the
surface, hold your arm out of the water for 5 minutes, and then reset
the mix without getting the contacts under water.  The obvious
solution to that one is to make sure you have the right mix set, even
if you are turning green and your buddy is already in the water.

If after all this anybody still prefers a MonitorII, I'd be happy to
sell mine for much less than the $800 I paid for it.

As for prices for the Vyper, why not look at the online stores.  I
would check fifthd first, but there are ohers, here's a list:

http://www.scubaworldsacto.com/
http://www.anywater.com/
http://www.atlanticcatalog.com/
http://www.bambooreef.com/
http://www.divesource.com/default.htm
http://www.diverdans.com/
http://www.divernet.com/
http://www.diversdirect.com/do/index.html
http://www.diversdiscount.com/indexaspcart.asp
http://www.dolphinscuba.com/
http://www.twodeep.com/Equipment/equipment.html
http://www.Submersiblesubmarines.com/pages/questions.html
http://www.goscuba.com/Main.html
http://www.h20adventuregear.com/
http://www.westmarine.com/cgi-bin/ncommerce3/ExecMacro/home.d2w/report
http://www.fifthd.com/gear/
http://www.landfallproductions.com/
http://www.leisure-pro.com/
http://www.lloydbaileysscuba.com/catalog.htm
http://www.marinskindiving.com/
http://www.discountdivers.com/index.html
http://www.northeastscubasupply.com/whips.html
http://www.pacificscuba.com/
http://www.russub.f2s.com/
http://www.scubaduba.com/schome.html
http://www.dacordistributors.com/
http://www.silent-submersion.com/
http://www.sportdiverhq.com/
http://www.tekdiver.com/bcs.asp
http://www.Submersiblesubmarines.com/
http://www.miamifantasias.com/

Cheers!

Huntzinger, Hugh A [AMSTA-AR-CCL-B] wrote:
~
>Poe Lim writes:
>>
>>  The absolute 3 minute stop issue is a myth, frequenty
>>  mentioned because it does do a 3 minute countdown, but there
>>  is no penalty to ignoring it...BUT if you do a continuous
>>  fast ascent, it will give you a 3m ceiling for 3 minutes,
>>  which is compulsory. And that 3 minutes countdown will
>>  continue even if you dip under 6m for 30 seconds or so.
>
>
>We had discussed some of this last fall.   My recollections are that one
>reportedly could blow off the 3 minute 'recommended' safety stop without any
>repercussions, but a qualifying fast ascent would prompt a fixed 3 minute
>'mandatory' SS.  If the diver fails to complete the entire duration of this
>stop by any amount, it results in his M-values being modified by some (not
>clearly specified) amount on subsequent dives.
>
>I agree that this approach is better than a complete lockout, but I suspect
>that I am uneasy and suspicious because this whole process of modification
>of M-values on subsequent dives reminds me far too much of the infamous
>Cochran Nemesis.
>
>
>Overall, this is probably more of a documentation issue to work through for
>those such as myself who are so inclined.  However, if the M-values can be
>modified, from a design standpoint, I would expect the computer's display to
>clearly report this information in real-time.  Any insight on if it does?
>
>
>
>-Hugh

--
Paul B.

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