Choosing A Dive Computer - Scuba Tech Tips: S04E03
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- เผยแพร่เมื่อ 3 ก.ค. 2024
- Dive computers are an important, often mandatory, item for safe diving. Alec explains the key features of dive computers so you can pick what matches your diving and budget.
**** Alec Peirce Scuba ****
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Almost dropped my Abacus!
I love this guy. his voice sounds like jim lahey and it gives me so much nostalgia.
Thanks for watching.
Well he is from Canada!
So glad I live a whole continent away from Alex's store. Go in for advice and I would end up buying up the whole store! He makes so much sense and is not afraid of any kind of modernisation of his beloved sport. You are a legend Alex! Keep passing your knowledge down to us newbies. It is well received and appreciated.
This man is the best on TH-cam regarding anything Scuba related, Iv been away from diving for 7 years just doing my dive master now and have watched alot of your videos they are brilliant ...
Thanks Kieran. Lots of bits of cool information to learn plus watch my Vintage Scuba to tell stories of the 'stone age' of diving!
Alec Peirce Scuba I will definitely watch all your videos Subscribed👍
I can watch this guy all day it’s amazing that I found this video I was just looking into diving computers and this had everything that I was trying to figure out thanks
Wow, thanks!
You said it Roynell… I’ve learned a BUNCH from Alec Peirce.
I have been diving for over 24 years with a computer. I still practice my table for that trip and the computer dies. I have an old sherwood source bought new in 1992 and has been my work horse. Love the easy use and the nitrogen bar. Tried new ones and sold them off. I still use the Sherwood Source. Don't fix if it's not broken. It fits perfect in my council. They definitely make my dives more enjoyable. And yes I keep the paper log book for the same reasons. I can go back and read my narrative of what I did and saw. My son a padi student right now learning tables in Okinawa Kadena AB. Your are right on all accounts on the video. Keep it up Montana Mike.
For such an old school diver as Alec Peirce, if he says get a dive computer, get a dive computer.
It's mandatory today on liveaboards and dive resorts. They don't want the liability or negative publicity around an accident that can be avoided.
You're videos are fantastic. Really enthusiastic, clear and informative. Thank you.
Thanks for watching. I'm just having fun. If you get something worthwhile out of it, I'm really happy. Alec
after 41 years of diving, Alex's presentation finally talked me into a computer... never saw that coming lol
Wow! Good to hear from you.
If you're like me, you will be really happy.
A dive computer makes scuba diving easy and enjoyable again, and safer too.
Take care.
Alec
my apologies , not alex but Alec!
Tech is a double-edge sword. Can help but to be too dependent is a bad thing. Love your take on how dive computers are getting more user friendly and giving you the joy of diving again.
This was the video i needed to watch, thank you! :)
Alec, thank you for the great videos!
What a great synopsis for dive computers! It is still relevant today. Thanks!
Thanks for watching Ron.
Alec
Great channel! What a privilege to be able to learn from someone with such rich experience. Thanks for sharing!
Thanks for your kind words Christer.
If I can help you avoid even one mistake I've made while gaining all that experience, I'm happy.
That ought to be easy for me to accomplish since I made plenty!
Thanks for watching.
Alec
I appreciate every word of this. Delivery was excellent and put me at ease
Glad it was helpful!
Great video. I really enjoy your tips even if Im not currently in the market for a dive computer. You always have good advice.
Love the tech tips, really enjoy this legendary diver instructor. He's the go to guy for advice.
Much appreciated Jam.
Thanks for another great video. I bought my first onebutton, Oceanic Data Plus, almost 20 years ago, and still working like a charm.
Just found your channel and I've enjoyed every video so far. I'm binge watching and learning a great deal. My first Dive was in 1972, then I wasn't able to dive again until 78. I went to college in the 2nd driest state in the US. I'm just getting back into diving since I stopped in the 1990's and I'm so glad to hear about the dive computers. I'm an older diver and I appreciate when you mention the ease with which our eyes can see the various gauges. If you haven't done a segment on corrected vision masks (I use readers only) I'd love to see one. If you have- I'll find it.
Thank you for taking the time to share your experience and expertise ❤
You are so welcome!
A
Love Your Videos!!! Thanks for putting the time and effort in to reeducation us older divers!!😂
Thanks for watching Clayton.
Alec
Your 60 years of wisdom shows. Thanks!
I'm just sorry that I have forgotten so much.
Thanks Ron.
Alec
Sir this has been a long time coming I appreciate your experience and simplicity. Thank you .....PS there are always people that have something to say let them open up a TH-cam channel then they can have something to contribute
I don't mind the comments from other divers. In fact, I often pick up more ideas for Tech Tips, and even for my own diving. I DO mind when a new diver (anyone with less than 10 years experience!) says with emphasis that his way is the best way and rejects out-of-hand any suggestions to the contrary. I simply wish they would be a bit less vociferous until they mature. Thanks for watching and for your support Ivory. Alec
Love my computer... When I learnt, my instructor went into great detail on both computers and tables. I like the fact we learnt both, it gave some history and put what the computer does into perspective.
Hi Alec, Pretty cool the technological advances in modern diving gear and this video was 3 years ago. Things to consider. Thank's for going over dive computer's. Dive Well 👍
Thanks for watching Mark.
Alec
Hello Alec. Thanks for passing your dive knowledge you experienced through your years. And sharing the wisdom across the world
Thanks for watching Azym.
I hope you're picking up some ideas.
Alec
Alec Peirce Scuba yess i am. I have learned alot and still more learn. Currently doing my rescue diving in kenya🇰🇪 😉😉
Fantastic video..i did my try scuba a month ago and will surely do certification. This video is been very informative. Many Thanks from Australia.
Yes. Yes. Do it.
You will never be sorry that you tried scuba diving.
Take care.
Alec
Thank youAs an old guy I really appreciate it. As a returning direct been renting gear and going to the Long Beach scuba show for a couple of years was a little intimidated to even ask about computers now at least I have an idea of what to start looking at keep up the down-to-earth explanations and teaching you’re a natural teacher and it’s fantastic
Get a simple, easy-to-read model RD and soon you'll wonder how you went diving without it.
Using a dive computer relieves you of many nagging concerns. It almost makes diving as much fun as it was in the 1960s when we really didn't know what we were doing so didn't care.
Long Beach is one of my favorite areas. I was there for a week or so this spring.
Good luck.
Alec
It´s called computer because it "computes" things.. for example it computes the transformation from sensor values to a unit we know like psi/bar/meter/feet.
It´s a good idea to know the tables / the models behind it, like ZH16c
Hi Alec, regards from Slovenia. I realy like your videos, there is a lot of knowladge presented in a way that's interesting to watch and is quite usefull, so thank you - keep the videos coming.
Although I'd like to say that a computer is actualy a computer, not just an integrated cicruit, It's got a microcontroller containing a cpu, ram, memory (not hard drive but still it is memory like eprom) etc. the main advantage is that it can be programed and reprogramed when a specific integrated circuit can only do the one thing it was designed to to and can not have any memory (for dive logs) or changes in the way it works.
Sir, you are the best! Thank you for all info! Cheers from Brazil!
Ahh! Brazil. One of the few countries I've not visited.
However, I know there are scuba fans in Brazil. I have sold some vintage gear to divers there and I have a set of Sea Hunt comics that were printed in Brazil, in Portuguese of course.
Thanks for watching.
Alec
Alec, another good thing about dive computers is that you can dive more. Using tables you still need to use your deepest depth and full duration to calculate your residual nitrogen time. Doing this you may do two or possibly three dives in a day. With the computer that monitors depth continuously (or at least every few seconds), you may safely get five or six dives in a day. It certainly makes for a more productive dive trip.
Love your no nonsense approach. New subscriber. Dive on!
Thanks Robert.
Alec
Thank you! I Love watching your videos. I consider your videos very informative and useful information for making decisions!! Johnstown PA
Awesome! Thank you!
Love your sense of humour and videos
Mine if I let my wife read this. She has a very different opinion about my humour.
Wow, Alec has a great way of explaining the nuances of the sport.
Thanks for your kind comments Bill.
I've been scuba diving regularly for almost 60 years this year.
I find it hard to believe that they can make a better fin but, the Scubapro Nova is proof that it's possible. I love them too.
Alec
I'm running through these videos like crazy. Can't get enough diving content, thank you sir!
Thank you ALEC. Great information
Glad it was helpful!
Absolutely agree that everyone Should have a dive computer. The number of times I’ve had other rec divers rely on my computer for depth, time, safety stops etc. Is scary. Really enjoy your videos!!!
Well said Jason.
thanks Alec for another great Vid. I too was taught tables and had no dive com when I was owd certified in 2014. they mentioned them but we never used one. now I use the tables AND my oceanic veo when logging dives in my logbook. I can't afford the interface cable to download info from my dive com to my pc so I do it the old fashioned way with a pen and paper.
Thanks again for another informative video !!!
Dive Tables have not been taught for over 2 years but some dive schools are slower than others to adopt new curriculum. We use computers in the class, pool and open water. Students love it, instructors love it and it's obviously safer. Do you realize that we can check to see what each student has done underwater after a dive? Try that with a depth gauge! Don't worry about writing out your dives in a log book. Some divers think that a computer allows then to no longer log dives but that's not the case. The computer knows the date, time and depth of the dive. That's all! It doesn't know the location, the weather, the waves, the current, your buddy's name, what you saw, the name of the wreck, your gear, your weight used and on and on. All of that is good information to have and fun to read as well. Plus, if you decide to go on and become a Dive Leader you need prove of dives with details. Don't throw out your log book yet!. Thanks for watching. Alec
I hear ya brother. I received my scuba cert in 1971. Went to navy dive school Groton CT sub base 1978 and worked a commercial air diver in 1986. Everything was skill and memorization of dive tables. When computers were first introduced in the 80's we called them,"bendomatics" because there was a real fear that they would fail. I understand that scuba cert train only with computers which is fine but sad. It's just an era gone by. It's just like how when we were kids, we all worked on our own cars but today you look under the hood and there is nothing recognizable. Auto maintenance is computerized and our skills from long ago are useless now.
There's no doubt things have changed. I first tried scuba diving in 1958.
I only have a beef with divers and even more with instructors who are stuck in the past.
Why deny yourself or worse, your students, greater accuracy and safety.
I've seen it a dozen times with SPGs(no thanks - I'll keep my J valve), BCDs (no thanks. I'm a good diver and don't want to look like a sissy), Safe Seconds (no thanks - we'll just Buddy Breathe) and so on.
I too lament the fun and freedom of early scuba but diving today is simply safer. That makes it better.
Take care.
Alec
I know this is from 2016, but I'm only seeing it for the first time today... I've been diving forever with a single pressure gauge, wrist mounted depth gauge and compass, and a quality dive watch and bezel. That's how I was taught when I went through dive school, where we planned out our dives meticulously using times and tables, and never really had a problem with it. However, today it seems everyone I know has a computer, even many of my professional dive friends. Perhaps it's time for me to finally look at getting one for personal use. Thanks for all the awesome info. Your videos are very much appreciated. :)
Nothing wrong with your vintage set-up. When I started diving in '58, we did the same - without a pressure gauge and watch. The SPG had not been invented (that wasn't until 1962) and we didn't have waterproof watches that a normal diver could afford.
Things change with time. Your set-up is finet but, like mine from the 50's, has been replaced by computers.
You can still dive as you have been so long as you practice the tables.
The dive computer gives a lot of extras though - multiple dives without a lot of calculations, no mistakes in reading depth or time, accurate surface intervals, logs your dives, allows more time underwater because it's crediting you for up and downs underwater and more.
You need to consider how much diving you do and go from there.
Thanks for watching.
Alec
A great presentation!
Don't stop, more, more.
A.
I've been diving the Uwatec Galileo Sol since 2008. I'm amazed that after all these years it still works flawlessly, truly worth every penny. sure every once in a while I'll loose connection to the transmitter, but its literally for a second or two. I love the fact that I get to choose how conservative I can make my dive profile. diving is a hobby for me so I prefer to err on the side of caution on all dives. I also love the fact that it alerts me on every detail of a dive, which helps me keep track of my dive as i'm taking photo's and videos. Another great feature is it tracks my heart beat. EXTREMELY useful info to have on a dive. not only does it help me regulate energy spent but it literally got me out of a very serious situation on a deep dive in Tobermory due to carbon monoxide intake (without me even knowing about it) during the boat ride out to the dive site. without this info there was a good chance that I wouldn't be typing this today. IMO, all mid to higher end computers should provide this feature. reality is computers provide a much safer dive experience for the masses. No matter how experienced you are, there is no way you can keep track of all the details on every dive like a good computer can.
It's good to hear from a diver who has used a computer for a long time and realizes just how beneficial they can be. And lived to tell about it too!
Thanks.
Alec
Great information. New to the diving scene and looking to buy my set up. Cannot thank you enough for information.
Regards,
Mike
Thanks for watching. Alec
Hi Alec, as always excellent presentation. Keep it coming
Thanks Jeric. Is this Jeric from Queens? Alec
Yes, How are you Alec? Thanks for sharing scuba information to all of us. Also, the reg works well. Regards.
Hi Jeric.
Glad to hear you're pleased with the reg. Already been diving with it - good news.
Take care Jeric.
Alec, I still use a sliderule and dive tables, but I also use an engineering calculator and a ScubaPro G2. The sliderule and dive tables help keep the brain sharp, especially when doing nitrox calculations other than 32% and 36%.
Great video as well. One thing to add is button size and gloves. If you wear heavy gloves the thinner watch style can be hard to push buttons with 5ml gloves.
That's quite right. The compact, wrist-watch styles don't work well in cold water - not because of the cold but because you can't work the buttons with thick gloves on.
Alec
Galileo Sol I purchased in 2009 and is still available today in 2016, has wireless transmitter and heart rate monitor. Swiss made and awesome.
Great videos btw.
Thanks from watching. Yep. The Galilieo is a good one. I just don't like it's size but it's sure easy to read. Alec
You are awesome man. Thank you for the great video
Thanks for watching.
Alec
I have started diving again and I love it. I got the chance to use a computer with my rental gear. It was so much better than a standard console and I am planning on buying a basic regulator set with an air integrated computer.
The AI Computer will certainly strain your $500 budget!
You can get a regulator with Safe Second for $500 but any computer will cost almost that much again.
An Air Integrated computer may be double that.
However, the safety and convenience of a dive computer makes the investment more than worthwhile.
Alec
Greetings from Malta, I am new to Diving and your tips info on what type of gear i require is fantastic thanks and keep it up.
Awesome, thank you!
Hi Alec, I love your informative videos. I just got padi ow certified (Georgian Bay). We were shown how to use computers, but had to learn how to use either the tables, or the eRDPml for all tests and the final exam. I felt that learning how to use the tables forced me to truly understand how depth, time, SIs, Res Ni, and PGs relate to one another and allowed you to dive safely w/out deco. Yes, I know they all track theoretical Ni absorption, and that no one learns the same way. I just used the tables to reinforce my general understanding. Because math was never my strong point, I used the dummy-proof eRDPml to double-check my answers. I understand the relative uselessness of using the tables, and the numerous advantages to using a dive computer. I think I'll buy a less expensive wrist computer now, and get an air-integrated computer when I buy my gear soon. I need bifocals and every year, I need stronger ones, so I think an air-integrated computer on a console might be best to see the numbers for me.
I have no problem with divers learning the tables. It's when learning the tables becomes a stumbling block to getting certified that I see red.
Understanding what's happening in your body is Ok too but that theory, the theory of decompression sickness, is a 10 minute lesson if presented in a straightforward, uncomplicated way.
Some of the hose mount AI computers (Sherwood Wisdom for example) are great for those with less-than-perfect eyes.
A wrist mount is usually smaller but if your bifocals are working well you'll be good.
Certified in Georgian Bay huh? A real diver!!!
Oooo1 That's gonna' get me in trouble!
Tae care.
Alec
Wow, Sir you are a 10000% natural!
Great personality even before your vast diving knowledge & Exsperience!
In another life if you would have sold cars you would own 25 plus car dealerships, I tip my hat to you Sir!
Wow, thanks Dennis.
A
As always, super-great. Maybe a word or two on air/nitrox options; He; number of mixes, switch on the fly. Maybe for next tech dive computers series ;-))) Thanks a million, really great video. Karl.
Alec, I am 50 and just getting back into diving after about a decade "off." I am fascinated by the changes that have been going on with the dive industry. In fact, I'm starting "all over" (because I want to and find it enjoyable). Dive computers are something I haven't really used and am excited to do so (just purchased a brand new SP Galileo G2 air integrated - not even here yet!). Years ago I had the first generation SP Stabilizing Jacket (complete with Gen 1 Air 2!). Many moons ago! I have been devouring your videos! Fun and informative. I love them! Keep em coming! Question: are you a SP dealer?
Hi Alec, I have been using dive computers since the late 1980's and for a time was importing a US brand into New Zealand. Some of the people I sold them to are still using them, a testament to their reliability.Here in NZ the most popular dive computers are those attached to the first stage in a console also containing a compass. This leaves the arms unencumbered, which is important here because many divers are hunting for crayfish (rock lobster) as it is legal here to take them on scuba. You didn't go into algorithms, and there are several available. I was using a Suunto Cobra with the RBGM algorithm, fine for singe day diving but not so good for multiday dive trips. The problem is that Suunto's algorithm does not clear of nitrogen for 100 hours, so on the first day one starts with 17 minutes NDL at 100 feet, on day two the first dive of the day gives you 16 minutes, on the third day the first dive NDL is 15 minutes, and so on, and even having a complete rest day doesn't result in much of an improvement. So for multi day dive trips I now use a Sherwood Wisdom 3, the dive algorithm in that assumes that the nitrogen clears from the system in 12 hours, so at the start of each day the diver has 19 minutes NDL at 100 feet. No doubt this is at the cost of some of the safety envelope, but with a fit diver and perhaps a rest day somewhere in the middle of the trip (pick a rough sea day), the algorithm is perfectly safe and is probably the most researched algorithm of any of them. Best wishes, Alan.
Thank you for the wonderful video!
Thanks for watching Yiannis.
Alec
Hello I was just certified about 9 months ago i have my padi cert and 4 fresh water dives at 59 ft and loved it. So the dive shop i got my certification from I bought my bcd and got my primary and scuba pro regulator good guys bye the way. Dean's dive shop in fla but anyways I want a air integrated computer i did the normal gear but I want to injoy more time on the dive. Came across this you tube guy who has been diving since the early day's and now I'm going to go buy air integrated Oceanic 4 thanks for helping me decide. Because one thing I learned in life people who have decades of learning in things thay love and joy im Listening. Sorry for my rant.....
Welcome to the diving world Mike. Hope you're still loving it many years from now and sharing your knowledge with others. Glad to help and safe diving.
Yeah, made my OWD last year (SSI) and we did lear about the divetables. It´s true, we learned how to use them but not very in detail, becaus you get used to computers during the SSI training program. greetings from Austria, good air, Andi
I compare dive tables to a slide rule.
Any machinist/draftsman/mathematician will tell you that the slide rule was the best thing to be invented to help in these and other industries, and that's possibly true - IF you don't include the computer!
No one, I repeat, no one learns to use the slide rule anymore.
Contrary to what older divers may say (always sounds odd when I say that - I'm 70 and been diving for 60 years), learning to use the dive tables is a colossal waste of time.
It simply makes learning to dive safely an onerous task, they will NOT be remembered and they do NOT give a diver the safety, accuracy and benefits of a dive computer. Also, and again in conflict with what some divers may say, dive tables cannot be used as a back-up to a computer without serious complications.
Take care.
Alec
I think what I heard is that they used it to explain how multiple dives and different depth affect your deco time and why. But I too was shocked that they still make student learn the actual table and have it on the padi test last year here (Santa Cruz, California)
Thank you so much! I purchased my first dive computer today :)
which one did u pick? i am still trying to pick my first one :)
I bought the Mares Smart Wrist Computer. I'm a girl so I was looking for something smaller and lightweight. It was about $320. But this is the one thing I wanted to spend some money on :) There are cheaper (and more expensive) options of course. It is very easy to handle (only two buttons) and easy to understand and read while in the water.
Ana Morales ah ok cool. I hope it works for u 😎
Maybe ill see u out there on a dive in the future 👍
I'm an embedded engineer. I design things like Dive Computer. Yes, Dive Computer are in fact, computers. They all have small CPUs in them. Instead of an HDD, they have flash. Yes, they have RAM, just like nearly all computers.
I think you're confusing your home computer as the only type of computer. Your dive computer, car ignition timing, microwave, even an electric razor, have full blown computers in them. Complete with RAM, FLASH, ROM, an Operating System (It's not Windows or Linux).
Thank you hack. I'm a computer user, NOT a computer tech. I appreciate your input. Or is that download??
When I think of a computer, I picture a device with lights, fans, noise, disc player, etc.
Something that is subject to breakdown in dusty, wet, bumpy environments, or sometimes for no reason at all.
That is certainly a simplistic view but I think pretty common. Thinking about such a contraption underwater is pretty scary.
I do know that very small, encapsulated CPUs are used in Dive Computers and that they're rugged.
Maybe having seen the development of dive computers over many years influenced my words.
I have a prototype dive computer from the 50's! Yep! The 50's. Needless to say it was mechanical but in the truest sense, it was a computer. It measured time and pressure (depth) and translated that information into a useable number on a dial. There were many such mechanical dive computers made like that until transistors and the current solid state age replaced them.
Thanks again.
Alec
I'm a deco diver and you've taught me more about diving than most instructors. Especially the history of diving. I loved your vid on the K-valve and J-valve name. But I still love my Jet Fins!
hwhack try the seawing nova if you have a chance... I really like those (thanks Alec!). Software/Electrical engineer myself so I had to test for myself a handful fins fully geared in a very large pool and see how fast/tried my legs felt. Ironically my cheap full foot tropical snorkeling where the best! (1/10th the cost of Nova) but nova were lot better than the others dive fins...
"octopuses we ate them" haha love you channel. A paradise for new and old divers
If you want more of my vintage humour, watch some of my Vintage Scuba videos from the 'stone age' of diving.
Alec.
@@AlecPeirceScuba_SeaHunter I already did. Thank you for all these amazing videos.
I love my computers both my rec and tech ones, but for a shallow single shore dive at my local lake I'll sometimes just run off tables from memory, then again I also taught myself to use a slide rule in 2012 out of curiosity and enjoyment for the old ways. Oh and always tables when I'm on my double hose and horsecollar.
I suspect like most that if you don't practice that slide rule you'll soon forget how to use it. The same applies to dive tables hence my advice to have a good computer.
In the 60's we often followed a couple of old 'Rules of Thumb'.
One states that you can't get bent (decom sickness) if using only a single 72 crf tank (NOT true!).
Another says that if you stay above 30' you can't get hurt (also NOT true!).
However, most of us survived which simply goes to show that diving is pretty safe.
Take care.
Alec
Alec you are awesome and i thank you so much
Thanks for your support Randy.
Alec
I learnt on tables 2.5 years ago with PADI - i am now computer only..... love my zoop she just past 50 dives, personalised alarms for depth and time. She has been with me all the way up to Rescue
The Zoop (formerly the Gekko) is a great basic computer - rugged, accurate and has all the features a diver really need. Maybe one day you'll want to consider an air-integrated unit so you don't have to scratch your head at all underwater! Thanks for watching. Alec
Thank you for the informational video
Thanks for watching Gator.
Alec
thanks for the info. I m ready to buy now i think
Make wise choices, its your money so ask lots of questions to be comfortable with your pick. It will be with you for a long time.
Alec
Thanks for another great video Alec! A dive computer was the first part of equipment I bought, apart from the freediving equipment I already owned before taking up scuba diving.
By the way, let me comment, as a computer engineer, that dive computers really are computers. They make computations, based on some input (time counting, pressure gauging etc) and they provide information as output. This needs a CPU and some RAM memory, things that reside in all dive computers. All these consist a proper computer, even if it doesn't have a hard disk or other peripherals you would find in your home computer. Well, actually it even has a kind of hard disk too. It is where your last dives and your settings are stored.
Also, although I trust electronics much more than mechanical devices, I would really like to see some statistics of dive computers vs mechanical gauges durability. I know I should address this question to the manufacturers, but I wonder what the average life span of each is.
Thanks again!
Absolutely agree. They very much are computers. PCs are not the only things that are computers.
I was trying to allay the fears that everyone has about 'computers'. I think we've all experienced the frustration of a broken drive, a frozen computer, slow speed, lost or unreadable files, etc, that seem to be part of owning a PC or even a mobile. Dive computers are just different enough (no mechanical drives for example) that those fears, fears that may stop divers from using a computer or relying on it, are unfounded. To be honest, I have no idea what specifically is in there. I do know that's it's waterproof, pressureproof, shockproof and freezeproof - features that my PC, laptop and mobile definately do NOT enjoy!! As to durability, while this topic is moot since analog is disappearing, I can tell you that dropping a computer, a dive computer that is, from 10' onto rocks is not good for it but will NOT impair it's performance while the same cannot be said for analog. Analog gauges are incredibly tough for such a fragile instrument but easily subject to breakage or at least inaccuracies from even a short fall. Alec
Alec, could you consider a video on how to use a dive computer to track your dives for entry into a dive log? How does all the information get input? What information is provided by the computer, what needs to be recorded at the dive site and how does it all get into your dive log? Do you recommend using dive computer software and is it worth the extra cost to have the quick disconnect feature on your dive console? What do dive resorts and dive boats accept in the way of dive logs, electronic or hard copy, and are the electronic computer logs something that they have a way to access? Do we do print outs of dive profiles or anything to insert into a physical log book? As always, your advice is much appreciated. Thanks,
Wow! That'll be a long video. I'll have to break it down.
A dive computer will record anything that physically happens. That includes the date, time, depth, bottom time, total dive time, temperature and everything else that happened underwater. Newer ones can record the general location as well.
What it can't record is things that you observe - marine life, visibility, buddies, surface conditions, dive boat name and so on.
Sometimes that information is important.
Generally a charter operation simply wants proof that you have sufficient dives to handle the proposed trip and that they were fairly recent. Thus a computer program will suffice in most cases. They will normally (should) accept the dive computer history provided they're sure it's your personal computer.
However, a dive log in my mind is deficient if that other, personal information is missing. I want to know the exact dive site, the conditions, my buddy, etc, for future reference. Check out my video on the really neat DeepBlu Cosmic computer coming soon. It'll blow your mind - a dive computer connected to your smart phone!
I like the Quick Disconnect. It allows you to take your computer onto the plane with you, to the bar after a dive or to your hotel room. It also makes it easier to charge the battery (if necessary) or to make changes to the program or for service.
Provided you are careful, there's no reason to NOT have the QD.
Take care.
Alec
I'm 17 and I've used a slide rule in the past week lol. I'll always use a calculator but I have fun challengeing myself with a slide rule once in a while. I'll still buy a computer as soon as I can afford one
Slide rules were what all the cool kids used back in the stone age. There are lots of dive computer models and features so I hope this makes your purchasing decision easier.
Slide rules are for n00bs; real men use log tables ;)
WOW Alec, I Love this channel!!! My name is Dan and I'm newish to the scuba world & thanx to your channel I have learnt a heck of a lot so thank you. :) I'm in Australia (Queensland) and looking at buying all my gear soon so I'd love to see a video on what you would choose for a BCD and Regulator if you just started. [Maybe your top 3] This would help a lot of people like myself In the same boat. (being spoiled for choice can make it hard when you are new to the sport) Thank you for your help in advance. Dan
I like the Oceanic products. Depending on your budget look at Alpha 9 or the Zeo. Currently I'm using a Biolite BC. It's the best I've ever seen for travel which is about all the diving I do now.
Always consult your local dive store. You must be able to get local service.
Good luck. Alec
Thank you Alec I will be sure to check them out, and a happy new year to you and your team :)
I know how to use Recreational Dive Planner and the table gives a good general idea of how long you can stay at a certain depth and compare it to the computer so that you are not too complacent with the computer information. A simple way to know the rate of ascent is to compare it to the velocity of the bubbles.
Having come from the 'stone age' of diving, following bubbles up is not a safe method of ascent. Bubble rise at different rates and are generally faster than today's safe limit. Remember tables are generic while a dive computer is specific to your actual dive profile. Be safe in what ever method you use.
@@AlecPeirceScuba_SeaHunter "Bubble rise at different rates and are generally faster than today's safe limit."
So the game is to fallow does bubbles in a lower rate! Or even that is not safe anymore?
Hi Alec, I think I've probably watched most of your videos and now try never to miss your latest one. Watching from the UK I wondered if you ever use or recommend European brands to your customers ? For example, Cressi manufacture loads of scuba gear that is suitable for entry level divers and available to us in the UK locally or even direct from Italy at quite reasonable prices. Perhaps you could make a video showing us Europeans some of your expertise in the use of non North American gear which is of course also available to us in the UK. Have you ever dived in Metres and Bars instead of Feet and Psi ? Keep up the good work with Kevin. best wishes Alan . Shoreham-by-sea, UK
Hello, Alec, and thank you for your all of your great insights for over the years.
I'd even say: "get TWO decent quality computers with identical decompression algorithm and learn to dive with them". Today price is not a problem anymore, but diving computer do get broken, and batteries do die in the middle of a diving week. So I always carry two < $200 Suunto computers with me when I dive. that way if one dies on the morning dive, I still have the dive history ont the other one and can continue diving in the afternoon.
I won't say it's a bad idea Nick, or is it Nickel?
Having seen, used and serviced hundreds, I personally feel a quality, new computer is enough. As I've said before, in the highly unlikely event that such a computer fails, the dive is over. Simple. Make a slow, safe ascent. No big deal. Many divers think it's a crisis if that happens but there are much worse things than a computer failure and that's becoming a piece of scuba history.
Re the identical algorithms, most new computers now come with the 2 main ones, DSAT and RGBM, installed so you can choose or switch between them. I have no idea why you would. If you were trained by PADI you'll use DSAT. If trained in Europe or a European colony, it'll be RGBM.
It's only if you are diving with a buddy using a different one that there could be differences. They are small but noticeable.
If diving by yourself, it doesn't really matter which you use - or is that self-evident?
Now for the hard question - without checking on Google, who knows what the acronyms DSAT and RGBM stand for?
Thanks for watching. Alec
Hello, Alec,
How nice of you to answer so promptly :-)
Actually I wasn't really thinking about a computer failure during the dive, but an accidental breaking or loss between one of the two dives of the day, or an empty battery during a diving week...
If you have only one computer, you have to wait until complete desaturation before diving again with a virgin replacement computer (which doesn't have your recorded dives, and thus current dissolved Nitrogen level), or do the afternoon dive with the old diving tables (french MN90 for me).
If you have a second computer with you on all dives, it will have that record, and you can trust it for the afternoon dive.
The identical algorithm (RGBM 100% for me) is just not to be bothered by diverging decompression stops between the two computers (we French are crazy enough to allow decompression stops and up to 60m dives with air ;-)).
Best regards,
Oh, I'll give it a shot (didn't look, promise) : RGBM must have Reduced Bubble Gradient in it, as it takes into account free gas and microbubbles in blood circulation.
DSAT, I don't know. Maybe something to do woth Desaturation?
Great try.
RGBM is Reduced Gradient Bubble Model, a highly theoretical decom model that is used by several European manufacturers and that has also been used in a modified form by others.
DSAT is Diving Science and Technology, the name of a PADI affiliate corporation charged with producing a decom model for recreational divers. It has been water tested intensively.
The main difference between the two is in the depth range of their respective safety factor. That is, the DSAT algorithm is more conservative at depths of 60'+ and more liberal in shallow water. The RGBM tends to have the same level at all depths.This is intentional since the DSAT was designed for recreational divers who spend more time in shallow water. It becomes more conservative, almost identical to RGBM at depths greater than 60'.
This is a very simplified explanation, an overview if you like, and should not be used for direct comparisons at any specific depth.
Hope I've given you something to think about.
Alec
Yep! If missing a dive is a life crisis for you (as it was for me for many years), your plan makes sense.
Alec
Very clear. Thanks
I always follow your amazing videos. Rgds. Cristian D. Escobar, 2 Star advance diver. From Argentina
Welcome 😊 and hello from Canada.
A
My local PADI dive center suggested the Cressi Leonardo for new recreational divers, it's one I'm thinking of at the moment but currently looking out for other ones too with planning to visit a couple of dive centers to see what the opinions are. When I was going through my PADI open water course back in 2014 we learned off tables only but now I am moving over to BSAC to do my Ocean diver then later Sports diver starting september I intend to get a computer as part of the core essentials like you recommended in a past video :>
The Leonardo is a good computer. I've sold and used it myself.
My only suggestion is to look at an air-integrated model if possible. You will want that eventually anyway and it sure puts the fun back in diving.
Take care.
Alec
Cheers Alec, taking this into account I am pushing towards the Suunto Vyper Novo (white for easier underwater viewing and decent size), but will be have a go with one and a couple of others like the Suunto D4i Novo, in the local dive shop around here first.
great video
You're videos have been great and I've watched many of them. The vintage gear is pretty amazing. I started diving on 1983 and you've taught me alot. With regards to this particular video I have that same combination that you have the I450t. It is an amazing set up!!
Glad you're enjoying the videos.
Thanks for watching.
Alec
Roy Cabalo gggggh
I dive with a computer and ive also learnt tables because if your computer packs up what are u going to do without tables and also ive been diving for 2 years
Great video sir but they are indeed computers. A circuit that is capable of running a program is a computer, albeit a simple one. Interestingly sim cards also have a tiny computer inside of them. Some countries use it for banking apps on phones. Thank you for all the effort you put into your videos and explaining things so well. Greetings from South Africa.
Thanks Zach. I dived and toured South Africa in Nov. 2017. Had a great time and shot some videos there too. Watch them starting at S06E17. Some wild water in Durban in zodiac's.
I agree. As a fifty year old man I started diving using tables. I prefer diving with my dive computer!!! Sunnto Viper!
Do you find as I do that it simply makes diving fun again? No more anxiety about depth or time limits.
Alec
The whole dive world needs to updated to today's standards, including getting rid of the stupid "support your local dive shop" bit. How long will people cling to the old and tired ways of doing dive shop business? With all the stuff you can by online, at better prices, who would "support their local shop" anymore? The shops need to get up to speed, clean up their horrible displays, messy floors, disgusting disorganized appearance. If you're an owner of a shop that fails to meet 21st century standards, think about turning around and making it better. I'm turned off by dirt and grime, messy counters, disorganized everything. And anyone who whines about "not supporting us" is full of bull. I don't need you. I love this guy, Alec... he's on point and doesn't pull any punches. Why not run a shop that caters to the customer, regardless of their "loyalties" and just treat them like real people? You know who you are.
Well Tom you have a few good points. Did you watch my video S08E18 Choosing A Good Dive Store? I cover the same points and watch S08E20 20 Local Dive Store vs Online Purchase as a LDS does have advantages over just price. You will find these interesting.
idea for another tech video - different computer algorithms. On recent class one of the instructor recommended against certain brands of computers for being too conservative - that your buddy/group might not want to dive with you as you may run out of deco time before everybody else... Suunto (have the cobra, but no issue as my buddy runs out of air before I do anyway) being one of them - can you touch more on that ?
IMHO - The tables will help with Murphy Law. Consider it a fire extinguisher. Especially in an area or island with few (possible dodgy) repair/rental options. The table is just a large card. Easily fits in a pocket or bottom of your dive bag or 'Save A Dive Kit' & very little weight. You'll just need pen & paper to work out a block/cog shaped dive plan.
Back up tank pressure & depth gauges would save your 7 day dive trip too.
Just an opinion, call it 'Plan D.'
Some divers still use tables however, many operators require dive computers, for safety and insurance liabilities, for all divers. Kevin has plan A, air integrated Cobra 2 computer; plan B, his backup wrist and transmitter computer, plan C, his buddies computer! Thanks for watching and sharing Tim.
@@AlecPeirceScuba_SeaHunter True, they do. Old habits are hard to break for some. Others use the paper & pencil dive table plan as redundancy. I agree, Dive computer should be your primary of course. No argument there. Just something to add to the bottom of a 'Save a dive' kit. It is also, a good skill to add to a person's Knowledge base.
The most important feature about dive computers are ascending speed calculation and (no)decompression calculations. If you may pass your deco limits it will tell you when and how long your deco needs to be. It's much safer.
Ascent rates are very hard to calculate and even harder to use whether with a computer or not.
It's been a problem since Day 1 and has still not been solved adequately.
In theory it's easy but in practice much harder.
The ascent rate you know is part of decompression. That is, the ascent rate is decided and combined with the stops to allow outgassing at a fixed speed. If you come up faster, not enough gas has left your body when you reach the next stop or the surface and you have an increased risk of sickness.
What few divers appreciate is that coming up slower is equally risky. I always cringe when I hear a diver say "I stayed down too long but I came up really slow so that's OK!". NOT!!! Ascending too much slower than the specified rate does not allow enough outgassing for that time period so when you reach the stop or surface you have too much left in or at least more than was anticipated by the tables. Essentially, coming up too slowly may mean that you are still adding gas - not losing it.
What I'm saying is the the ascent rate is a fixed number - 60' per minute - no faster AND no slower.
This is of little interest if you're well within the No Decom limit but as you get closer it becomes a factor.
And it's very hard to judge your actual rate. The old rule of "slower than your smallest bubbles" is way off. Trying to keep track of a depth gauge and a watch at the same time is impossible. And there are no good alternatives for recreational divers.
A computers helps but bear this in mind. If the computer indicates that you are ascending too quickly then you slow down of course. Then it may indicate that you're ascending a bit slower than you should so you speed up right? Unfortunately, those actions, going faster or slower to adjust your ascent rate do not meet the strict requirements of the decompression table model.
What I'm saying is that the tables are based on a fixed ascent rate - no faster or slower and there's no inclusion for adjustment. You either come up at a steady 60' per minute or you are no longer within the tables.
And since there is an inherent risk of decom sickness even if you do follow the tables to the letter, it all adds up to a risk for recreational divers if your approach or exceed the No Decom limits.
I may do a video about this.
Thanks for watching.
Alec
Alec your a rockstar.
I'm not sure if he has done one yet but I would love to see a vid on full face masks with safety concerns and tips and underwater communication devices. :)
Not yet Mitchel. If you want to see FFM's from the stone age, watch this from my Vintage Scuba playlist S04E02 "Scubapro's Visionaire Full Face Mask? See how they compare to todays models.
Thank you so much for these videos Alec. I'm a diver with some experience that was trained on old gear, and you have been an amazing help so far. Could you help clarify a little bit about the types of regulators that work with the dive transmitters or the other air integrated units? What sort of first stage regulator is required? Do many regulators have the ability to have the transmitter as well as an alternate air source?
All modern regulators are fitted with at least 2 HP ports (for SPGs and Transmitters). They usually have at least 4 LP ports as well for the primary, safe second, BCD inflator and drysuit.
If you are inquiring about vintage regulators, the story is less clear. The first had no additional ports beyond the single LP for the primary. Then, in the early '60s, an HP port was added for the newly developed SPG and eventually more LP ports as BCDs and then Safe Seconds became popular.
The tech diving sector was responsible for the addition of a 2nd HP port since they wanted a computer AND an SPG.
If you have an older reg, you can use adapters to add these additional items to it. Just be sure that any fittings used for HP are high pressure rated. Swivels and TEEs are available in both LP nd HP. Don't put an LP fitting into an HP port which is possible because, on older regs, the thread was identical on both. It led to some funny and less-than-funny serious problems.
I hope this answers your question.
Alec
@@AlecPeirceScuba_SeaHunter Thank you! You're the best!
Mr.Peirce, do not know if is worth considering or if is already covered in more recent videos, but IMO many divers could benefit a lot from videos showing the basics of how to use some fairly modern and popular dive computers, for example among a few, the SUUNTO's Vyper, Novo, ZOOP line of DC's. Best regards.
Thanks for the idea, it's in Kevin's list for possible future videos.
A
@@AlecPeirceScuba_SeaHunter thank you Mr. Peirce.
Alec I was trained with dive tables 3 years ago, i am trained today with equivalent dive tables. I am even trained with planning a dive and ALWAYS use my wet notes, and trust them more than a computer, when doing deco. Of course I do use a dive computer but that computer's indications are only 30 or 40 percent taken into consideration during a 70 m dive. 😎. I fear of new divers to be a buddy of mine if they do not know what EAD is or how to set and use gradients.
I don't disagree with you but I also accept that the world is changing rapidly. What are you going to do the first time you jump into a cab or a bus and there's no driver behind the wheel? In time, a short time, there will be no wheel!! The first dive computers were quite funny. No one trusted them and with good reason. But now, it's academic. Many resorts require divers to use computers. You can hang on as long as possible to the old ways but maybe you're putting yourself at a disadvantge. If you don't embrace computers, they're coming anyway. So eventually you either won't be diving or you won't know how to use a computer. Alec
+Alec Peirce Scuba I do nit disagree with dive computers at all (i even consider that 2 are bettr than 1) but I would not dove with someoane as a buddy who has no idea what basic gas and deco calculations are.
In 1958 my scuba diving instructor Al Hocking, ex-navy, said to the entire class, "Don't buy one of those single hose regulators. They'll kill ya'!" Again, things change Chirana, like it or not. In a short while you'll be hard pressed to find a dive buddy who knows the basic tables much less gradients. One analogy is insisting that your financial adviser knows how to use an abacus or even a slide rule!! Think about this - a dive computer is not really a computer in the common understanding of that device. It has no drive, no program, etc. It is more correctly compared to an integrated circuit. It simply takes numbers from it's sensors (timer and pressure gauge) and sorts them according to the circuitry. I too would be very skeptical if dive computers were made by Microsoft or required a boot-up or had a drive. Anyway, I certainly understand your feelings but suggest you start looking ahead at innovations in diving or you'll be left behind. It's easier to keep up than to catch up. Thanks for your ideas. Alec
I am getting back into diving after 18 years. I had a Suunto Solution Alpha. But the factory service center couldn't repair it. I'm going to have to tables. Can't afford a replacement yet.
Hi Alec. Love the presentations. My only question for you: Does the very last set-up(air-integrated with a transmitter) also have a compass function?
Most modern computers, certainly the upper end ones, have a built-in electronic compass.
It works pretty well and is easy to access. Simply hold the top button down for 3 seconds or more an it turns the entire face into a compass.
Alec
Adam I've got a Suunto eon core and it's got an electronic compass.but bear in mind it's advised by Suunto to recalibrate it at nearly all dive site
Ive just done my open water lic at 55. Why did i put it off?
Question, instead of a compass can you get a gps tracker? Would be handy to log the exact position of the boat before heading off + easier to direction find your target objective.
The university of practical experience has a lot to teach me.
A compass has no battery and works above and below the water. GPS's don't work underwater, need batteries otherwise submarines would use them instead of inertial laser ring gyroscopes. Some day there will a GPS type product, until then practice with a compass or use natural navigation skills.
Take care Geoff.
Alec
Nice shiny chrome draw Barracuda. If not using the non computer SPG, and using computers to gauge air. I’d prefer two computers to cross check any failures whether computer or non. Then again nothing is fail safe. And there will always be risk to Diving.
I agree Spooky.
Of course, I believe the greatest 'risk' to diving is driving to the dive site!
Good gear, well maintained will mitigate most of the risk from that department anyway.
Take care.
Alec
I changed my Suunto favor air integrated computer for a Suunto eon core.with a tank pod best move ever so easy and simple to use..but I still keep a spg and depth gauge connected for back up
You are using an analog depth gauge and spg to back up a computer. Kinda' like using a calculator to back up your iPad.
But, if it makes you feel better, go for it.
Alec
@@AlecPeirceScuba_SeaHunter yep maybe but I still like seeing the dials there and not just numbers displayed
Do people actually dive without spgs?
Hi Alec,
I was guided to your channel and this episode in my quest to find an air integrated computer. Can you make an episode comparing the differences between a DSAT and PZ+ algorithm? Specifically I am just putting my kit together and don't want to buy something basic. I am looking for a DSAT integrated and can't really find too many options for Nitrox Rec divers out there. Atleast, not without getting into the Technical Diving kit and that is overkill for something like that. I'd love to stay within 500 Dollars, but, so far, it looks like a more realistic figure would be 800-1000 for something new.
Generally most modern computers will handle both. You can make that choice in settings.
The ones that don't are almost all DSAT - certainly in North America.
I'll look into it.
Alec
Check youtube "Scuba diving algorithms: DSAT vs PZ + Which is better". PZ+ is more conservative.
Hi Alec. Came across your channel recently and now I'm addicted. Great stuff in a down-to-earth, easy-to-consume format. I have an air integrated computer with a quick disconnect (QD) hose. If I'm diving with an operator that stores my gear overnight, and I decide to take the computer off the high pressure QD hose, are there any risks to doing this? Should the computer end of the hose be protected somehow? I've heard that water getting into the hose would be a problem. Thanks!
There ought to be a plug for the bottom of the computer module so when you detach the hose you can plug the open end of the computer.
Likewise there should be a cap for the end of the hose. When the computer is removed, the open end of the hose should be covered.
If your computer did not come with these caps, try to make up something that will work. I know that the Suunto Cobra Computer has a cap and a plug. They ought to fit most other makes.
The problem when they are not covered is the possibility that water (or dirt) will get into the bottom of the computer or into the open end of the hose. If that happens, when you re-attach the computer and turn on the air, high pressure air will force that water into the computer internals and that could be disastrous. Neither the hose end or the computer bottom (the spigot on the bottom onto which the hose fits) hold much water but it only takes a few drops to cause a problem.
Unfortunately there is no way to blow air through the computer high pressure hose to clear it. You could try a short blast of air from the tank valve into the end of the hose before fitting the reg to the tank. That might work.
There is no was to water out of the spigot on the bottom of the computer.
Good luck.
Alec
Thanks Alec for the quick and thorough reply! We have both the Sherwood Wisdom and Atmos AI air integrated computers, and neither came with caps/plugs. I'll head over to my LDS to see what they have. Thanks again.
Hey Alec, greetings from the Philippines! I got my OW certification a few months back and I've been enjoying your videos ever since. You actually remind me of my dad. :)
Wrist type computers are just so expensive but it sure is essential these days. I find Suunto D6i Novo/Zulu to be the best looking all-around machine. I can't wait to own one! What do you think?
If you have good eyes it's fine. Older divers might have trouble seeing the numbers. But the Suunto gauges are very good. Make sure you can get easy local service for them. Good luck. Alec
Thanks for the tip! I do have a little bit of astigmatism but I'm hoping underwater magnification will be enough for me to see the computer well (saw your other video on prescription lenses, btw, great stuff!). There is a Suunto local service in our area but the model I just mentioned is not yet in the market in our region.
Well I went to the dive shop and ended up walking out with suunto vyper wrist computer. So far I learned how to set the time! It was a commission sale and I gave $80 for it, and they replaced the battery
And it's not beat all up, and has been cleaned out to factory settings. I don't see it being any better then a watch and my tables, no deeper go or longer then I stay down.
Any dive computer is superior to the old tables but a tank pressure gauge is also required. Have fun diving.
@@AlecPeirceScuba_SeaHunter yeah I will be holding on to the pressure gauge regardless... I some how got hooked on to watching my air with them. Haha.
I was told to empty my tank as part of my commercial training and I did... I was at 80' when I did and I was able to still go to another of my class mates and let them know I was out and leaving.. didn't panic in the least... He offered his octopus but I just waved it off and headed for the surface. I got to the decompression stop and had air again. When I got to the surface I told the other guys that came up already I was going back down and see what happens. I got about 25' and no more air. it was well worth seeing what it was like.
Way off the subject , but I got my PADI open water certification in 1990 when I was 20. Ive only went diving a handful of times since. Last time being 15 years ago. what would you suggest as in equipment and retraining. has equipment changed much? Im assuming YES! we used to use the dive wheel and cards for dive time. is that still used?
As always I enjoyed watching this Tech Tip. Thanks for making them. In several PADI specialty courses they stress having redundancy. In your experience what components do you need a spare for? Is it worth also having an analog depth gauge for that redundancy?
As I've indicated here, today's dive computers are so close to being 100% reliable and accurate that to carry an extra, old tech, fragile and inaccurate analog gauge is a purely personal choice, but certainly not necessary. As for other items that warrant a back-up, how about brains? Seriously, if you have modern, quality scuba gear, there's really no need for redundancy. Now, before I get shot, I'm assuming recreational, non-penetration dives within sport diving depth limits and good environmental conditions. Of course, if you're cave, or penetration wreck, or deep. or low vis, or under ice, or any other dives that do not meet the above description, redundancy may well be good if not adviseable. As you've said, these types of dives are well described in their Specialty Courses. Follow that advice and have fun. Thanks, Alec