Dive computers

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

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)?


-hh

-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.

I am going to begin Diving after 25 years.
The dive computers are a new thing for me.
Anybody heard of any bad incidents or problems or failures?
Do they really make diving more worry free or can they be a chore.
would I be happy with one or will I enjoy the dive more using the
traditional analogue systems and figure out the dive table myself on
land.
Thanks
Harlan

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?

On Fri, 11 Nov 2005 19:45:11 GMT, gocart <harlanjs@pacbell.net> wrote:

>I am going to begin Diving after 25 years.
>The dive computers are a new thing for me.
>Anybody heard of any bad incidents or problems or failures?
>Do they really make diving more worry free or can they be a chore.
>would I be happy with one or will I enjoy the dive more using the
>traditional analogue systems and figure out the dive table myself on
>land.
>Thanks
>Harlan


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gocart wrote:

> I am going to begin Diving after 25 years.
> The dive computers are a new thing for me.
> Anybody heard of any bad incidents or problems or failures?
> Do they really make diving more worry free or can they be a chore.
> would I be happy with one or will I enjoy the dive more using the
> traditional analogue systems and figure out the dive table myself on
> land.

Nothing wrong with knowing the tables. Everyone should. That way, when
they get a computer, they'll realize how much more bottom time they can
have. As for worry-free, nothing really is. I think in all the years of
diving with a computer, only one has crapped out on me, and it was a
backup computer (Areis Atmos Pro hockey puck). It was replaced under
warrantee and has worked great (taken it down on the Andrea Doria with me).

Seems like everyone agrees that the computer is the way to go and with
the price of the "basic efficient', according tho the reviews in Scuba
diver mag, Sherwood Profile down to less than 300 bucks I'm going for it.
As long as I keep within the safety zone I shouldn't have any problem.
Thanks,
Harlan