Dive computers

-hh wrote:

>
> I seriously looked at them several years ago, and at that point in
> time, pretty much all of the available products' interface designs were
> dangerous, in that they failed to clearly differentiate between time
> remaining due to air and time remaining due to no-deco limits...most of
> them did a "lesser of", whereas some actually blinked back and forth.
>
I have an Aladin AirZ Nitrox (hoseless AI). Mine shows remaining
no-deco time, shows remaining gas, and shows how much time I have left
at that depth and safely make it to the surface.

Dennis Willson wrote:

> I really like my air integrated computers. I know people that think they
> wouldn't like it, but none of the people I know that say that have
> actually used one.

CAUTION! This statement may be true, but it is meaningless in determining
the good/bad points of air integrated computers.

THINK about it...

Naturally the people who have one like it. Otherwise they would not
have one -- or would have got rid of it.

Similarly, the people who don't have one probably don't because they
don't like it.

Take a close look at WHO uses AI dive computers and who doesn't.

Ask yourself which group has the more experienced and more skilled divers.

If you "really like" your AI computer, it is likely because you like the
information it gives you -- specifically, remaining air time. Unfortunately,
the computer calculation of remaining air time has many assmptions, and
at least some of these are almost always wrong. As a result, no matter
what "remaining air time" the computer shows, you need to know from your
dive plan that this is high, low or (occasionally) right on. Since you
need to know that anyway, why bother with an AI computer? It is just one
additional thing that can confuse you.

--
Charlie Hammond -- Hewlett-Packard Company -- Ft Lauderdale FL USA
(hammond@not@peek.ssr.hp.com -- remove "@not" when replying)
All opinions expressed are my own and not necessarily my employer's.

On Mon, 14 Nov 2005 09:14:55 -0500, Lee Bell wrote:

> "BarryNL" wrote
>
>>> You should definately learn the tables... A dive computer is handy -- but
>>> if hte battery dies, and you haven't done your
>>> tables.. well; what's OK for next dive?
>>
>> Hmm, I did a dive yesterday with a maximum depth of 30m and a bottom time
>> of 38 mins. If my computer failed what's OK for the next dive on tables?
>
> Assuming you did not blow off decompression during the dive, there's no
> problem. Take out your tables and pick whatever the highest repetitive dive
> group is. Use that to plan your surface interval and next dive.
>
> While it is not usually possible to go from a multilevel dive computer to a
> specific repetitive dive group on any table, it is normally possible to go
> to a group that is at least as conservative as your actual condition. If
> you have not incurred a deco obligation that you failed to meet, then the
> highest group on your table has to be as, or more conservative than your
> actual group and, accordingly, can safely be used to plan your next dive or
> dives.
>
> If you do not know whether you met all deco obligations on a previous dive,
> then you really should have been paying more attention to what you were
> doing, and what your computer was telling you, during that dive and,
> frankly, are probably not competent to be planning a next dive until you've
> met the surface interval requirements of whatever computer you chose to use
> for the subsequent dive.
>
> Lee

Dive with more than one computer if you don't want to suffer the
pain of lost dive time due to a failed computer.

<nospam@all.please.net> wrote

> Dive with more than one computer if you don't want to suffer the
> pain of lost dive time due to a failed computer.

More than one computer that uses the same algorithm, please.

Lee

-hh wrote:
> nitespark <nitespark@cox.net> wrote:
>
>
>>-hh wrote:
>>
>>
>>>I seriously looked at them several years ago, and at that point in
>>>time, pretty much all of the available products' interface designs were
>>>dangerous, in that they failed to clearly differentiate between time
>>>remaining due to air and time remaining due to no-deco limits...most of
>>>them did a "lesser of", whereas some actually blinked back and forth.
>>>
>>
>>I have an Aladin AirZ Nitrox (hoseless AI). Mine shows remaining
>>no-deco time, shows remaining gas, and shows how much time I have left
>>at that depth and safely make it to the surface.
>
>
>
> To clarify, you mean that this particular dive computer model shows
> three numerical values simultaneously at all times?
>
> IE: (minutes/no-deco), (PSI), and (minutes/air-consumption)?

Here is what I use. It does not show air consumption rate such as CFM
on the display, but that data can be downloaded onto a PC. It does show
remaining PSI in my tank on a constant basis. Also does not show water
temp, but that data also shows when downloaded to a PC.

http://us.uwatec.com/products/air_z_...trox_wrist.asp

Main Display
------------------------
Upper left- Current Depth
Upper right- Dive Time
Lower left- Maximum Depth
Lower right- Time left for no deco

Center- Ascent rate and also CNS O2

Sub Display
------------------------
Left side- Tank Pressure
Right side- Remaining time to safely reach the surface (with reserve air)

Captain's log. On StarDate 14 Nov 2005 07:32:58 -0800 received comm from "-hh"
<recscuba_google@huntzinger.com> on channel rec.scuba.equipment:

: > Also another option I really like is the computer link. It allows me to
: > download my dives to the computer showing graphs of the dive profile.
:
: At an additional cost of usually around $100 (Suunto), since they often
: don't come standard with the dive computer itself.

FWIW: it came in the package with mine (Suunto D9). Included both the USB cable
and also the software (also free to download for everyone -- good to check out
before buying the computer).

martin

--
Martin Törnsten - http://martin.tornsten.com/


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Hi all,

Sorry for reviving an old thread, but I thought I ought to correct Hugh
(see below).

What looked like a typo to him is actually true: our new Sensus Ultra
device will be able to store about 2000 (TWO THOUSAND) hours of depth
and temperature profiles at a 10 second sampling interval. That's a 20-
fold increase in capacity over our existing model...pretty astonishing
for something the size of a matchbox, we think!

Kris Wilk
ReefNet Inc.
www.reefnet.ca


"-hh" <recscuba_google@huntzinger.com> wrote in
news:1131982378.654717.298570@f14g2000cwb.googlegr oups.com:

> YMMV, but I consider Les Wilk's dedicated datalogger, the "Sensus", to
> be a much better value product, as not only does it include
> multiple-OS support, but it has 5x the data logging capacity. More
> info on the Sensus can be found at:
>
> http://reefnet.ca/products/sensus/
>
> BTW, I think Les probably has a typo on his webpage...I think the new
> Sensus Ultra only will log 200 hours @ 10sec interval (not 2,000
> hours), as this would be double of the 100 hours @ 10sec that the
> Sensus Pro does.
>
> Also, the Sensus also uses an *open* file format that's very easy to
> export into other applications for doing whatever you want: within
> his GUI, you can do a copy-n-paste into MS-Excel, for example.