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Scuba Forum / General / December 2005

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Nathan and Nadine - 27 Dec 2005 09:25 GMT
Hello to you all,

My name is Nathan and my wife's name is Nadine. Now that we have
introductions out of the way...

We moved up to Alaska recently and are thinking about picking up
diving. I kick myself now for not having learned how when I spent a
year in Florida, but that's another story.

She and I love to spend time outdoors, currently we have more hiking
gear than is healthy.

We've been looking around locally and the dive shops around here are
running pretty good deals (I think?).

One dive shop is willing to give us our open water certification with
dry suit for a cost of $800 for the both of us. Is that a good deal? It
includes all equipment minus mask, fins, snorkel, gloves, booties, and
dive knife. I don't want to sound cheap, but the Army pays a meager
salary so I'm trying to get the most bang for my buck. Also, I've been
looking around online at dive equipment and various packages that are
being sold. So far, I'm finding everything to be between 800 dollars
(for equipment google finds hard to locate) to 1800 (for equipment that
google locates more reliably and looks really cool). Is that what I can
expect to spend on a full set of basic dive equipment?

Also, once we do ultimately get up and running, I'd like to put out the
invitation to anyone in the Anchorage area to go diving and/or hiking.
So far we've been pretty quiet and kept to ourselves for the most part,
which has taken its toll during the short days and long nights of
winter we've been having. I think it'd be fun for us to get out and
meet new people.

Also, if anyone would like to share pointers, hints, tips, etc. they
are more than welcome. I've always believed we have two ears and one
mouth because we should listen twice as much as we speak.

Feel free to email me personally, or reply here if it is easier.

Well, I apologize for any senseless rambling I may have done, and feel
free to laugh at my ignorance.

Hope to hear from you all soon and hope to make some new adventuring
buddies. Thanks in advance for any replies.

Nathan... Nadine is sleeping right now :)
ben bradlee - 27 Dec 2005 13:20 GMT
> One dive shop is willing to give us our open water certification with
> dry suit for a cost of $800 for the both of us. Is that a good deal?

Yes

> It
> includes all equipment minus mask, fins, snorkel, gloves, booties, and
[quoted text clipped - 5 lines]
> google locates more reliably and looks really cool). Is that what I can
> expect to spend on a full set of basic dive equipment?

It is possible to spend almost any amount on equipment.  Save your money,
though, with those long nights the little n's will be coming soon.
Lee Bell - 27 Dec 2005 14:02 GMT
> Hello to you all,

> My name is Nathan and my wife's name is Nadine. Now that we have
> introductions out of the way...

Hello Nathan.  Welcome to rec.scuba.  If your look around the group a bit,
you'll note that there's a lot going on that seems to have nothing to do
with scuba.  Don't let that bother you.  There's a wealth of scuba related
information available here for those that seek it.  It's just that many of
us have been here a long time and long since exhausted everything we could
think about that relates to scuba.  As will happen, we've moved on to other
topics, but, for most of us, scuba is the love that brought us together.
Think of it as a world wide local sports bar.  While scuba is the purpose of
the bar, everything that people think and do is fair game here.

Like most bars, you'll find the proud and the humble, nice people and jerks,
the religious and the profane.  Many of us change with the topic.  Hope you
enjoy your stay but, if not, well, the door swings both ways.

> We moved up to Alaska recently and are thinking about picking up
> diving. I kick myself now for not having learned how when I spent a
> year in Florida, but that's another story.

You should kick yourself.  Depending on what part of Florida you were in,
you passed up some wonderful diving opportunities.  Those of us that live in
Florida, think anyone that would dive where ice actually forms naturally are
a bit crazy, but what the heck.  Much of the world thinks our diving is
crazy too.

> She and I love to spend time outdoors, currently we have more hiking
> gear than is healthy.

Remind me to tell you about our new ATVs sometime.

> We've been looking around locally and the dive shops around here are
> running pretty good deals (I think?).

Maybe, but I'd be surprised.  Typically, the best deals are to be had where
the most competition exists.  I would not expect a lot of competition in
Alaska.  Then again, I live as far from Alaska as it is possible to be
without leaving the US (just outside of Fort Lauderdale, Florida).

> One dive shop is willing to give us our open water certification with
> dry suit for a cost of $800 for the both of us. Is that a good deal? It
> includes all equipment minus mask, fins, snorkel, gloves, booties, and
> dive knife. I don't want to sound cheap, but the Army pays a meager
> salary so I'm trying to get the most bang for my buck.

That does not sound like a particularly good or bad deal.  It's tough for me
to guess how much the drysuit portion of the course should increase the
cost, but I would not expect an entry level diving course to run more than
about $250 per person, including everything except the cost of boat charters
for the open water portion of the course.  There are courses available in
this area for considerably less, but you have to be careful.  Sometimes you
get what you pay for.  Occasionally, you get more.

Have you checked to see if the Army has some kind of dive training program
you might be able to take advantage of?

> Also, I've been looking around online at dive equipment and various
> packages that are
> being sold. So far, I'm finding everything to be between 800 dollars
> (for equipment google finds hard to locate) to 1800 (for equipment that
> google locates more reliably and looks really cool). Is that what I can
> expect to spend on a full set of basic dive equipment?

Depends on what you mean when you say "full set of basic dive equipment."
If you're including a dry suit, which you surely will need in your part of
the world, the cost of good equipment will be more.  Personally, meaning I'm
not real knowledgeable on the subject, I'd expect to pay close to $1,000 for
the dry suit.

The cost of the rest of your equipment will probably run another $1,000 or
more depending on what equipment you chose to buy (versus rent), the brand
you chose and, once again, local competition.  Until you know a lot more
about what you want, I do not recommend on line shopping for dive equipment.
It's very easy to get what you think is a good deal only to find that the
equipment you get is not what is best for your needs.  Here's some
suggestions that may help:

Mask - Unless you already know of a mask that fits you right, you have to
buy your mask personally.  Fit is everything and you can't check the masks
without holding it in your hands and trying it.  Do not settle for a mask
that does not fit perfectly, no matter how cool it looks or sounds.

Fins and Booties - I wear full foot fins.  That's not really an option for
cold water divers.  You're going to have to get strap fins and booties to
get the thermal protection you'll need.  Stick with brand names.  A couple
of the most popular are Mares Quatro Fins (my personal preference) and Scuba
Pro Jet Fins (the choice of some of the most advanced technical divers in
the world).  There are other good fins on the market, but it's hard to go
wrong with either of the ones I mentioned.

Snorkel - Anything with a large bore that is comfortable in your mouth is
fine.  Don't spend money on anything advertised as "dry."  The dry snorkels
may be worth the money to those that snorkel a lot, but probably not even
then.  They are surely not worth anything to those that are diving.

Regulator - When I say regulator, I mean one first and two second stages.
Regulators of comparable quality are available in a wide range of prices.
All of the well known manufacturers make some good and some better
regulators.  Some of the unknown manufacturers don't make any that I'd give
my wife to use.  When buying your regulator, there are three things you
should keep in mind.  1. Your alternate, what some would call your octopus,
will be used only in emergencies.  There is no time when it's more important
to have a good regulator than in an emergency.  While it's OK to save money
by not getting the same features on  your alternate that you have on your
primary, it is not OK to save money by buying inferior quality.  2. You're
going to be diving in cold water.  Because they reduce pressure from a few
thousand psi to approximately ambient, regulators tend to cool the gas that
passes through them.  In cold water, this can lead to freezing up and
failure.  Do some research, with people that know, to identify regulators
that are suitable for cold water use.  Do not simply take a manufacturer's
word that theirs is.  3. Different manufacturers use different intermediate
pressures.  Intermediate pressure is the pressure in the hose between the
first and second stages.  It's important that the intermediate pressure out
of the first stage be consistent with the intermediate pressure the second
stage is designed for.  Intermediate pressure can be adjusted, but there's
generally no way to adjust for differences in your primary and alternate
second stages.  Be sure that everything is set to work together.  The
easiest way to do that is, normally, to purchase first and both second
stages made by the same manufacturer.  In my many years of diving, I've used
US Divers and Scuba Pro regulators.  US Divers regulators are generally
looked down on by today's high tech crowd, but more people have done more
dives with them than anything made by anyone else.  You can sometimes find
deals on US Divers equipment.  Scuba Pro has consistently been ranked as one
of the top few regulators in the world.  I currenlty use Scuba Pro.  While
their quality is very good, their cost tends to be high.  You don't find
many deals on new Scuba Pro regulators.  In recent years, Apex/Apeks (?)
regulators have become very popular.  Someone here will tell you which one
everybody likes.  I have no experience with them, but people I trust to know
what they're talking about like them very much.  Best of all, they have a
good reputation with those that, like you, dive cold water.  I believe there
are some deals to be had, but will leave that to those that know better.

Buoyancy Control Device - Possibly one of the hottest topics and any diving
discussion is which BCD to use.  A substantial number of people in this
group, including me, favor a plate and wing configuration.  This is,
essentially, a metal plate with a harness and an inflatable bladder that
goes between the plate and the tank(s).  I don't know anyone that has ever
used a plate and wing setup that has gone back to a jacket style
configuration.  I do know one diver, who will probably chip in to this
discussion soon, who tried the plate and wing and went to something else,
but the something else is not a jacket style BCD.  I'll let him tell you
about his choice and why he chose as he did.  Be sure you at least give a
plate and wing configuration a try.  Halcyon makes the best known plate and
wing combinations, but are expensive.  DiveRite is another well known
manufacturer.  There are others.  Plates come in both aluminum and
stainless.  Otherwise, a plate is, more or less, a plate, no matter who
makes it.  Wings, the inflation part of the system, are not all created
equal.  Get the wing that meets your buoyancy needs (will have considerably
more lift than anything I'll ever need for my diving) and go for good
quality.

Lee

> Also, once we do ultimately get up and running, I'd like to put out the
> invitation to anyone in the Anchorage area to go diving and/or hiking.
> So far we've been pretty quiet and kept to ourselves for the most part,
> which has taken its toll during the short days and long nights of
> winter we've been having. I think it'd be fun for us to get out and
> meet new people.

Thanks, but no thanks.  Personally, I think that anything less than 68 F is
too cold to dive in.  Even at 68, the diving would have to be special to get
me in the water.

> Also, if anyone would like to share pointers, hints, tips, etc. they
> are more than welcome. I've always believed we have two ears and one
> mouth because we should listen twice as much as we speak.
> Feel free to email me personally, or reply here if it is easier.

> Well, I apologize for any senseless rambling I may have done, and feel
> free to laugh at my ignorance.

Senseless rambling is a way of life here.  You did better than most.

Thanks for introducing a scuba related post.  There haven't been enough of
them lately.

Lee
Steve - 28 Dec 2005 22:52 GMT
> Because they reduce pressure from a few
> thousand psi to approximately ambient, regulators tend to cool the gas that
> passes through them. In cold water, this can lead to freezing up and failure.

I'm not trying to pick nits, but to help reduce the chances that Nathan (or anyone
else, FTM) might get confused, I'll point out that you have that backwards. Expanding
air gets colder whether the expansion is regulated by a regulator or if it expands
abruptly when the container it's in ruptures. The expanding, and therefore cooling,
air cools the regulator. The more and/or faster the air expands the colder it will
get, and the air can easily drop to below freezing temperatures. It the air can carry
enough heat away fromthe regulator, it will also cool to beklow freezing tempertures.
In warm water the regulator will regain enough heat that freezing is unlikley (at
least at anything resembling normal air consumption rates). If the water you're
diving in is only 38 or 40 degrees the regulator isn't going to absorb much heat from
it, so there's a far greater chance that it will get cold enough to freeze any
moisture passing through it.

I would think that an instructor teaching in Alaska is woefully negligent if they
don't explain this during the class.

Signature

Steve

The above can be construed as personal opinion in the absence of a reasonable
belief that it was intended as a statement of fact.

If you want a reply to reach me, remove the SPAMTRAP from the address.

Lee Bell - 29 Dec 2005 11:58 GMT
>> Because they reduce pressure from a few thousand psi to approximately
>> ambient, regulators tend to cool the gas that passes through them. In
>> cold water, this can lead to freezing up and failure.

> I'm not trying to pick nits, but to help reduce the chances that Nathan
> (or anyone else, FTM) might get confused, I'll point out that you have
> that backwards. Expanding air gets colder whether the expansion is
> regulated by a regulator or if it expands abruptly when the container it's
> in ruptures.

Nit picking is a time honored tradition here, but if you're going to pick,
it's good to pick correctly.  I didn't get it backwards.  Neither did you.
Reducing pressure from a few thousand psi to approximately ambient is, in
fact, expanding the gas.

> The expanding, and therefore cooling, air cools the regulator. The more
> and/or faster the air expands the colder it will get, and the air can
[quoted text clipped - 6 lines]
> greater chance that it will get cold enough to freeze any moisture passing
> through it.

> I would think that an instructor teaching in Alaska is woefully negligent
> if they don't explain this during the class.

Me too.  The issue, in this case, relates to the choice of equipment for
purchase, something that is often done before the instructor has a chance to
relate such potentially important information.  Of course, all us
experienced equipment buyers also know that even instructor opinions are
sometimes biased by the brand of equipment their shop sells (gross
understatement).

Lee
ben bradlee - 29 Dec 2005 13:07 GMT
> >> Because they reduce pressure from a few thousand psi to approximately
> >> ambient, regulators tend to cool the gas that passes through them. In
[quoted text clipped - 10 lines]
> Reducing pressure from a few thousand psi to approximately ambient is, in
> fact, expanding the gas.

The statement regulators tend to cool the gas is where the nits were sent to
slaughter.  Expanding gas cools the regulator.  If anything, the regulator
provides an impediment to the cooling of the air.
mike gray - 29 Dec 2005 15:01 GMT
>  
>
[quoted text clipped - 19 lines]
> slaughter.  Expanding gas cools the regulator.  If anything, the regulator
> provides an impediment to the cooling of the air.

And how many angels can dance on the head of a pin?

The expansion of the gases takes place across the high
pressure/low pressure interface. That happens twice in a modern
scuba reg, once at the first stage input valve, again at the
second stage input valve.

Cooling takes place in each stage, though one advantage of a
multiple stage reg is that the cooling is not as dramatic in
either stage as in a single stage reg.

The reg itself does act as a heat sink, but it's not
specifically designed as such and is not very effective.

The bottom line remains - if yer gonna dive in Alaska, ya really
need to understand the expanding air/cooling relationship.
Matthias Voss - 29 Dec 2005 16:29 GMT
>>>>> Because they reduce pressure from a few thousand psi to approximately
>>>>> ambient, regulators tend to cool the gas that passes through them. In
>>>>> cold water, this can lead to freezing up and failure.

>>>> I'm not trying to pick nits, but to help reduce the chances that Nathan
>>>> (or anyone else, FTM) might get confused, I'll point out that you have
>>>> that backwards. Expanding air gets colder whether the expansion is
>>>> regulated by a regulator or if it expands abruptly when the container

>> The statement regulators tend to cool the gas is where the nits were
>> sent to
[quoted text clipped - 3 lines]
>
> And how many angels can dance on the head of a pin?

Depends on how hot the pin is. Dancing, though may cool it
down, or heat it up.

That's why I'd better like to call it heat transfer than
cooling.
Heat is transferred from the water to the reg to the
expanding air. That is why the reg gets colder, and the
surrounding water as well.

Matthias
Steve - 30 Dec 2005 07:38 GMT
> Heat is transferred from the water to the reg to the expanding air. That
> is why the reg gets colder, and the surrounding water as well.

Heat is always transferred from warmer materials to colder materials. In cold water
the heat may well be transferred from the reg to the water, at least at the beginning
of a dive. Unless the reg is extremely cold we can be sure that the heat transfer
between the reg and the gas passing through it will usually be from the reg to the gas.

Signature

Steve

The above can be construed as personal opinion in the absence of a reasonable
belief that it was intended as a statement of fact.

If you want a reply to reach me, remove the SPAMTRAP from the address.

Matthias Voss - 30 Dec 2005 14:14 GMT
>> Heat is transferred from the water to the reg to the expanding air.
>> That is why the reg gets colder, and the surrounding water as well.
[quoted text clipped - 4 lines]
> can be sure that the heat transfer between the reg and the gas passing
> through it will usually be from the reg to the gas.

 And from the water to the reg. The expanding air'
temperature may be 40°C lower than the surrounding water.
This make the drection of energy flow pretty predictable.

Matthias
Lee Bell - 30 Dec 2005 01:23 GMT
> And how many angels can dance on the head of a pin?

3,212.756

Lee
Scott - 30 Dec 2005 01:34 GMT
> And how many angels can dance on the head of a pin?

Define "pin".
Don - 30 Dec 2005 01:52 GMT
>> And how many angels can dance on the head of a pin?
>
> Define "pin".

Your head.
nisarel@postmaster.co.uk - 31 Dec 2005 02:26 GMT
Steve - 30 Dec 2005 07:33 GMT
> Reducing pressure from a few thousand psi to approximately ambient is, in
> fact, expanding the gas.

Yes, but the regulator doesn't expand or cool the gas, rather it allows the gas to
expand, which is what the gas wants to do. The regulator's purpose is to keep it from
expanding too quickly. I just wanted to clarify the idea that the expanding gas cools
the regulator rather than the other way around.

> The issue, in this case, relates to the choice of equipment for
> purchase, something that is often done before the instructor has a chance to
> relate such potentially important information.

Fortunately, he's already been warned that buying too soon is often a bad thing.

>  Of course, all us
> experienced equipment buyers also know that even instructor opinions are
> sometimes biased by the brand of equipment their shop sells (gross
> understatement).

Surely you jest.

Signature

Steve

The above can be construed as personal opinion in the absence of a reasonable
belief that it was intended as a statement of fact.

If you want a reply to reach me, remove the SPAMTRAP from the address.

George Price - 30 Dec 2005 20:04 GMT
>> Hello to you all,
>
[quoted text clipped - 53 lines]
> available in this area for considerably less, but you have to be careful.
> Sometimes you get what you pay for.  Occasionally, you get more.

When we had our twins certified two years ago, the program was 295 each.  It
included the checkout dives at Lake Denton and openwater in Key Largo and
all rental equipment (except mask and fins).  It was actually cheap
considering the instructor came to our house for the instruction and pool
sessions to train four kids.

> Have you checked to see if the Army has some kind of dive training program
> you might be able to take advantage of?
[quoted text clipped - 124 lines]
>
> Lee
Dennis (Icarus) - 27 Dec 2005 14:03 GMT
> Hello to you all,
>
> My name is Nathan and my wife's name is Nadine. Now that we have
> introductions out of the way...

Hi I'm Dennis.

> We moved up to Alaska recently and are thinking about picking up
> diving. I kick myself now for not having learned how when I spent a
> year in Florida, but that's another story.

I feel the same way about 5 years I spent in the Monterey, CA area.

> She and I love to spend time outdoors, currently we have more hiking
> gear than is healthy.
[quoted text clipped - 4 lines]
> One dive shop is willing to give us our open water certification with
> dry suit for a cost of $800 for the both of us. Is that a good deal? It

I think so - comparable to what my local shop runs for an OW cert + drysuit
class.

> includes all equipment minus mask, fins, snorkel, gloves, booties, and
> dive knife. I don't want to sound cheap, but the Army pays a meager
[quoted text clipped - 4 lines]
> google locates more reliably and looks really cool). Is that what I can
> expect to spend on a full set of basic dive equipment?

If your shop has a good selection/variety of rental gear, rent first.
You'll save money in the long run by not having to replace gear that yolu
thought would work for you, but didn't

> Also, once we do ultimately get up and running, I'd like to put out the
> invitation to anyone in the Anchorage area to go diving and/or hiking.
> So far we've been pretty quiet and kept to ourselves for the most part,
> which has taken its toll during the short days and long nights of
> winter we've been having. I think it'd be fun for us to get out and
> meet new people.

Sounds good - if I ever find myself in Anchorage, I'll post here.
Been wanting to dive in the Arctic.

> Also, if anyone would like to share pointers, hints, tips, etc. they
> are more than welcome. I've always believed we have two ears and one
> mouth because we should listen twice as much as we speak.

Works nicely, of course with Usenet we have two eyes and 10 fingers, so does
that mean we can
type 5 times as much as we read?

> Feel free to email me personally, or reply here if it is easier.
>
> Well, I apologize for any senseless rambling I may have done, and feel
> free to laugh at my ignorance.

Nah - you're willing to learn, and you seem to know what you don't know.
We reserve the laughter for folks who dont know, but think they do, or those
who are unwilling to learn
;-)

> Hope to hear from you all soon and hope to make some new adventuring
> buddies. Thanks in advance for any replies.
>
> Nathan... Nadine is sleeping right now :)

Cool.

Dennis
Popeye - 27 Dec 2005 15:11 GMT
> Hello to you all,

 Howdy.

> One dive shop is willing to give us our open water certification with
> dry suit for a cost of $800 for the both of us. Is that a good deal?

 It almost has to be.

 What kind of drysuit?

> It includes all equipment

 Do you mean rental?

>minus mask, fins, snorkel, gloves, booties, and
> dive knife. I don't want to sound cheap, but the Army pays a meager
[quoted text clipped - 4 lines]
> google locates more reliably and looks really cool). Is that what I can
> expect to spend on a full set of basic dive equipment?
JRE - 27 Dec 2005 22:03 GMT
><snip>
>
[quoted text clipped - 10 lines]
>
>  

Around here, open water certification costs about $300 per student, and
dry suit certification is another $150, which includes suit rental.  So
$800 for two people certainly sounds reasonable to me.

Consider begging, borrowing, or renting different equipment to find out
what fits and works for you before buying any.  What seems to fit you in
the shop won't always work in the water (and vice versa).  Above all,
don't skimp on equipment.  You don't need to spend a fortune but  you
will need a regulator (including octo) that's reliable in cold salt
water, and a dry suit and BC(D) that fit you and support the kind of
diving you anticipate doing.  If the dive shop has suitable used gear,
especially BCs and dry suits in good condition, consider it
seriously--this can be a real cash-saver.  But, you will probably want
to avoid the economy regs that are standard rental fare.  Also, make
sure you buy reasonably new regs so service parts will not be a problem
in the immediate future.  (I have two regs that might need to be retired
in the next few years because of this.  Too bad.  They work great.)  
Next, make sure you get regs one of the local shops will service!  They
should be a reasonably common brand in case you need repairs while
traveling or wherever you're posted next.  Last, find and talk to
experienced divers in your area to find a shop that has a style you are
comfortable with.

><snip

Hope this helps,

John Eells
nospam@all.please.net - 27 Dec 2005 23:46 GMT
> Hello to you all,
>
> My name is Nathan and my wife's name is Nadine. Now that we have
> introductions out of the way...

8<

> Also, if anyone would like to share pointers, hints, tips, etc. they
> are more than welcome. I've always believed we have two ears and one
> mouth because we should listen twice as much as we speak.

This is a low volume, high signal/noise newsgroup only if you
engage your newsreader's twit-filters.

> Thanks in advance for any replies.
>
> Nathan... Nadine is sleeping right now :)

You're welcome. Have a good time.
Nathan and Nadine - 28 Dec 2005 04:09 GMT
Just to follow up,

I'd like to thank everyone for responding so far. The responses and the
knowledge within has been great.

I managed to score a deal at the diveshop we chose to exchange some
computer coding services for basic+drysuit+nitrox? certification at no
charge to us. We still have to buy the basic equipment, but that really
helps. I'm not quite sure what the nitrox is. It's been explained to me
that it's an oxygen enriched gas that helps you stay under longer
without getting fatigued and also helps you go deeper by allowing you
to ascend more quickly with shorter decompression times?

Oh, as far as the regulators and all the other stuff, we'll be renting
that for a while to come. All the equipment we need for the dives are
included minus the stuff we have to buy, which looks like we'll be
spending about 450 to 500 dollars on. I called up one of my buddies who
has been diving for years (and really secretly talked me into it, even
though he doesn't know he did), and all he could respond with was
surprised and ecstatic noises. I can imagine him doing a fist pump
after I told him about the certification we were getting for free.

In talking to the dive instructor, he walked me around his shop and
showed me the equipment we'd be using. Halcyon this and something else
that. I do remember for a fact we'll be diving with a plate setup. He
showed me the drysuit and quoted me some really high price on what they
cost, and walked me through all the other equipment. It seemed to me
(not knowing anything about it) that it was pretty good equipment as he
was really proud of it and REALLY proud that his company outfitted
their students in better equipment while learning than any of the other
shops here in Anchorage.

Oh, in response to the competition, there are quite a few dive outfits
here in Alaska. Apparently we have some awesome diving out here, dunno,
going to find out next month!

And cold water is good for you! It gets your heart beating quickly,
makes your lungs and muscles all tight, and lets you know you are alive
when everything starts to burn. Plus, it's kind of exciting in a way
because the way everyone is making it sound (up here) "you'll learn to
be a better diver in cold water". Again, dunno, just repeating
statements, but one can dream, no?
ben bradlee - 28 Dec 2005 10:11 GMT
> ... but one can dream, no?

Yes.
Joe English - 28 Dec 2005 13:06 GMT
> Just to follow up,
>
[quoted text clipped - 8 lines]
> without getting fatigued and also helps you go deeper by allowing you
> to ascend more quickly with shorter decompression times?

If you instructor told you that you would be better to forego his
instruction.  YOU CAN NOT DIVE DEEPER ON NITROX - YOU MUST DIVE
SHALLOWER.  - you will hear plenty about that misconception I am sure on
this newsgroup
Lee Bell - 28 Dec 2005 15:44 GMT
It's much more likely that the instructor got it right but the student
misunderstood.

Lee

>> Just to follow up,
>>
[quoted text clipped - 13 lines]
> HALLOWER.  - you will hear plenty about that misconception I am sure on
> this newsgroup
Joe English - 29 Dec 2005 05:16 GMT
> It's much more likely that the instructor got it right but the student
> misunderstood.
[quoted text clipped - 18 lines]
>>HALLOWER.  - you will hear plenty about that misconception I am sure on
>>this newsgroup

agreed
Nathan and Nadine - 29 Dec 2005 07:39 GMT
Hello to everyone again!

Well, I've spoken to him more and have an even better deal now. For
more services on my part, he's going to give my wife and I everything
he can through PADI, and if all goes well this spring, he should be
qualified to instruct the GUE? program, so she and I will receive that
as well.

I haven't been to any classes yet, they won't start for us until mid
February (brrrr!!!!). I really am looking foward to getting in the
water though. I love swimming ( at least I've always had fun swimming
underwater with my eyes open and scaring my unsuspecting victim on the
surface ).

Well, I'm off for a few days to go have a wild Alaskan adventure, so I
must rest.

Thanks for all the responses and we'll keep everyone informed on our
journey as we learn to dive.

Nathan and Nadine
-hh - 29 Dec 2005 13:25 GMT
> Hello to everyone again!
>
> Well, I've spoken to him more and have an even better deal now.

Sounds good.  Overall, my initial cut was that a generic good quality
OW-I class had usually been around $250ish (lowballs are $99, with a
lot of hidden extra costs), so with the inclusion of all rental
equipment, plus extra Cert's, your initial cost looked pretty
reasonable.

> Well, I'm off for a few days to go have a wild Alaskan adventure, so I
> must rest.

IIRC, its Fort Richardson that's outside of Anchorage.  I'm not sure if
their ski area there is still open, but it looked pretty promising when
I was through there a few years ago.  A lot better to ski at this time
of year, IMO :-)

> Thanks for all the responses and we'll keep everyone informed on our
> journey as we learn to dive.

Please do; I have a friend in Eagle Creek that I need a good excuse to
go visit again :-)  And please pay attention to the warnings you'll
start to get in the spring about the hazards of the longer summer hours
- - there's a lot of solo highway fatalities due to falling asleep
behind the wheel, often being newcomers who go out fishing "until
sunset" and lose track of time.

-hh
Lee Bell - 28 Dec 2005 15:43 GMT
> I managed to score a deal at the diveshop we chose to exchange some
> computer coding services for basic+drysuit+nitrox? certification at no
> charge to us.

Good deal.

> We still have to buy the basic equipment, but that really
> helps. I'm not quite sure what the nitrox is. It's been explained to me
> that it's an oxygen enriched gas that helps you stay under longer
> without getting fatigued and also helps you go deeper by allowing you
> to ascend more quickly with shorter decompression times?

Not exactly.  Nitrox, as we use the term, is oxygen enriched gas.  It may or
may not reduce fatigue.  Different people report different results.  It does
not, however, allow you to go deeper.  In fact, it does not allow you to go
as deep as you can, with the same degree of safety, on air.  What it does is
reduce the amount of nitrogen absorbed versus air at the same depth.
Depending on how you use it, it either reduces the amount of nitrogen in
your system at the end of a dive or allows you to extend your time beyond
what you would normally do on air.

> In talking to the dive instructor, he walked me around his shop and
> showed me the equipment we'd be using. Halcyon this and something else
[quoted text clipped - 5 lines]
> their students in better equipment while learning than any of the other
> shops here in Anchorage.

If he's using Halcyon equipment for his training, he's telling you the
truth.

> Oh, in response to the competition, there are quite a few dive outfits
> here in Alaska. Apparently we have some awesome diving out here, dunno,
> going to find out next month!

> And cold water is good for you! It gets your heart beating quickly,
> makes your lungs and muscles all tight, and lets you know you are alive
> when everything starts to burn. Plus, it's kind of exciting in a way
> because the way everyone is making it sound (up here) "you'll learn to
> be a better diver in cold water". Again, dunno, just repeating
> statements, but one can dream, no?

Your cold water diving is different, that's for sure.  You will need a more
extensive skill set than I need for my warm water diving and it's probably
true that you will be able to adapt to warm water diving easier than I would
be able to adapt to cold water diving.  It is not true that you'll
automatically be as good a warm water diver as someone with comparable
talent and experience.  Each diver has a set of skills that best match the
diving he or she does.  Diving cold water, diving in warm water, diving in
low visibility, diving in high visibility, diving in confined water, diving
in moving water, diving in the ocean, diving in shallow water, diving in
deep water and diving in overhead environments are all different.  You will
be best at what you do most often.

Lee
JRE - 29 Dec 2005 16:58 GMT
>Just to follow up,
>
[quoted text clipped - 5 lines]
>charge to us. We still have to buy the basic equipment, but that really
>helps.

Awesome.

>I'm not quite sure what the nitrox is. It's been explained to me
>that it's an oxygen enriched gas that helps you stay under longer
>without getting fatigued and also helps you go deeper by allowing you
>to ascend more quickly with shorter decompression times?
>  

Nitrox is a mixture of nitrogen and oxygen, with a higher percentage of
oxygen (and thus less nitrogen) than atomospheric air.  Nitrogen gets
absorbed in the body's tissues under pressure.  When the mix has less
N2, less gets absorbed in the same amount of time.  This can help you
stay longer at intermediate depths without decompression.  But oxygen
becomes toxic at high partial pressures, which imposes depth (and other)
limits on nitrox use.  The limits vary with the mix.  Last, you should
_never_ ascend quickly, whether breathing air or Nitrox.  All this will
be part of the class.

Trust the books and instructors first, but learn all you can, too.  (For
example, PADI says Nitrox exposures to 1.6 atmospheres partial pressure
of O2 are fine, while GUE says 1.4 is a better guideline.  The more I
read the more I start to lean toward GUE's view.)

>Oh, as far as the regulators and all the other stuff, we'll be renting
>that for a while to come. All the equipment we need for the dives are
[quoted text clipped - 5 lines]
>after I told him about the certification we were getting for free.
>  

Too bad your dive shop is so far from here!  (We are fortunate to have a
very good one locally, but they don't have deals this good.  ;-.)

>In talking to the dive instructor, he walked me around his shop and
>showed me the equipment we'd be using. Halcyon this and something else
[quoted text clipped - 6 lines]
>shops here in Anchorage.
>  

Sounds like you found a good shop.  Dry suits are expensive.  Mine was
about $1,400, and top of the line suits can be double that or more..  
But I got my son a (barely) used one for $500 for Christmas this year,
and you can get a quite decent one for around $1,000.

>Oh, in response to the competition, there are quite a few dive outfits
>here in Alaska. Apparently we have some awesome diving out here, dunno,
[quoted text clipped - 8 lines]
>
>  

Cold water also has dangers that warm water does not.  Nothing that
can't be managed (I'll be diving in NH on Saturday), but regulators that
work in cold water and adequate thermal protection are mandatory.  
Getting cold is bad.  Lowering your body temperature impairs judgement
and increases the risk of decompression illness.  You should be about as
warm in the water as you are sitting in your living room.  Less obvious
is that the dry suit's wrist and ankle seals should not be too tight.  
If there isn't good circulation to your hands and feet, there will be an
increased chance of DCI in your hands and feet.  Plus, they will get
cold.  Cold feet are merely uncomfortable, but hands warm enough to
function well are a requirement!

John Eells
Steve - 30 Dec 2005 07:41 GMT
>> I'm not quite sure what the nitrox is. It's been explained to me
>> that it's an oxygen enriched gas that helps you stay under longer
>> without getting fatigued and also helps you go deeper by allowing you
>> to ascend more quickly with shorter decompression times?

> Nitrox is a mixture of nitrogen and oxygen, with a higher percentage of
> oxygen (and thus less nitrogen) than atomospheric air.  Nitrogen gets
[quoted text clipped - 5 lines]
> _never_ ascend quickly, whether breathing air or Nitrox.  All this will
> be part of the class.

IIRC, Lee suggested that the instructor explained it properly and Nathan
misunderstood what he was told. I don't know that any instructor would suggest a
faster ascent is okay with nitrox but there apparently are some people who have
claimed that nitrox results in a slower "equivalent" ascent or some such nonsense,
and it's possible tha the instructor alluded to this. We had a lengthy discussion
about that here, perhaps 3 or 4 years ago. I don't doubt that the instructor actually
said that nitrox results in less fatigue, but it should be made clear that there is
nothing but anecdotal evidence to support such claims. Instructors may also claim
that nitrox is safer than air, but that's a gray area. You may be less likely to get
bent, but bent can mostly be fixed. Dead from Ox tox is less likely if you're
breathing air, and much harder to cure than DCS.

Signature

Steve

The above can be construed as personal opinion in the absence of a reasonable
belief that it was intended as a statement of fact.

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mike gray - 30 Dec 2005 15:49 GMT
> You may be less likely to get bent, but bent can mostly be
> fixed.

Or you can spend yer life incontinent and in horrible pain as
many have done.

Dead from Ox tox is less likely if you're breathing air, and much
> harder to cure than DCS.

Few, if any, divers ever died from oxtox. It is most dangerous
in open circuit where the complicatons include drowning. And it
is equally likely at given PPO2, regardless of the mix.

The cure for oxtox is reduction of PPO2, preferably to 0.21,
easier than aspirin.
Lee Bell - 30 Dec 2005 20:52 GMT
> You may be less likely to get bent, but bent can mostly be fixed.

Fix my elbow, please.

> Or you can spend yer life incontinent and in horrible pain as many have
> done.

I'm not incontinent (yet) or in horrible pain, but I do get a twinge every
now and then.

> Dead from Ox tox is less likely if you're breathing air, and much
>> harder to cure than DCS.

Dead from anything is kind of hard to cure.  Based only on years of reading
reports by others, death from DCS seems considerably more common than death
from oxtox.

I prefer to watch both my nitrogen and my oxygen.

> The cure for oxtox is reduction of PPO2, preferably to 0.21, easier than
> aspirin.

Yep.  It's one of the first things divers are taught.  They call it an
ascent.

Lee
Steve - 30 Dec 2005 23:05 GMT
> Fix my elbow, please.

Sorry, but I said "mostly" fixed, and that's not my line of work, anyway.

> Dead from anything is kind of hard to cure.  Based only on years of reading
> reports by others, death from DCS seems considerably more common than death
> from oxtox.

Based on what I've read it's not all that easy to get bent that badly. Straying
slightly past your NDL might bend you, but it isn't likely to make you fizz like an
instructor's bottle of soda. Real fizzing usually takes real effort. In our
collective experience, even diving air as if it was nitrox after a heavy day of
diving is most likely to result in some elbow problems, rather than anything truly
serious. At least in theory, straying slightly past your O2 limits can result in a
seizure that will likely result in drowning. If you'd been as close to your O2 limits
as you apparently were to your NDL, and had gotten nitrox when you thought you had
air, do you think your day could have turned out even worse? Given a very unlikely
scenario that probably has severe consequences and an unlikely scenario that probably
won't have severe consequences, I'll consider the former to be the greater danger if
not the greater risk. "Safer" is a fuzzy concept, and my point was simply that a flat
statement that nitrox is safer is incomplete, if not inaccurate.

Signature

Steve

The above can be construed as personal opinion in the absence of a reasonable
belief that it was intended as a statement of fact.

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Lee Bell - 30 Dec 2005 23:47 GMT
> Based on what I've read it's not all that easy to get bent that badly.

That's probably true, but I still think it happens more often than oxtox.

> Straying slightly past your NDL might bend you, but it isn't likely to
> make you fizz like an instructor's bottle of soda. Real fizzing usually
> takes real effort. In our collective experience, even diving air as if it
> was nitrox after a heavy day of diving is most likely to result in some
> elbow problems, rather than anything truly serious.

> At least in theory, straying slightly past your O2 limits can result in a
> seizure that will likely result in drowning.

Actually, it's still a pressure/time relationship.  A brief foray into no-no
land normally does not result in convulsions.  The consequences of taking an
oxtox hit while underwater are, admitedly, more serious than taking a DCS
hit, but either can kill you and, apparently, DCS does so more often.

>"Safer" is a fuzzy concept, and my point was simply that a flat statement
>that nitrox is safer is incomplete, if not inaccurate.

In my personal opinion, nitrox is safer on the same dive for the same period
provided the dive is within the recommended MOD for the gas.  If you venture
beyond your MOD, whether it's on air or nitrox, you increase your risk.

Lee
 
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