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After 15 years of trusting sheer water
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computers on hundreds of deep technical
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wreck dives, I've recently added the new
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Perix 2 bronze journey edition to my kit
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and it's now my offboard CCR backup of
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choice. It's a really important computer
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to me as it's the one that I use to
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control my decompression. Now, there's a
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reason she water has become the computer
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of choice for almost all technical
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divers and integrated into a whole load
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of rebreathers. Simple fact is their
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reliability, their capability, their
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performance at depth is unmatched.
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And that's why this isn't my first sheer
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water. It's the latest in a long line of
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them that have kept me safe on a whole
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load of deep dives. In this video, I'm
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going to talk to you about my five
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favorite things that I love about sheer
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water computers. But first of all, I
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want to talk about the difference
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between the Perdict 2 bronze journey
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edition and the Perdex, the original
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Perdict that I've been using for the
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last 8 years, I think. Now, some of
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these are cosmetic, and let's be honest,
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the Perdict 2 Journey Edition does look
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a whole lot better than the original
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Now, although that's nice, it's not
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really what I want to focus on. What I
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want to talk about is the things that
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make a difference to me as a diver. And
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the most important one is the
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improvement to the screen. Simply, it's
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noticeably brighter and noticeably
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clearer than my Perex one. Now, that's
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not to say that the original Perex
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didn't have a great screen because it
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did and it does. It's just that it's
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been taken to the next level by the
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Perix 2. I think that's a really
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important thing because on any dive
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you're going to want to get information
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from a screen quickly and the brighter
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and clear it is it is the less likely
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you are to get it wrong. You're going to
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take the information in quicker and for
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people like myself who are doing long
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deep dives particularly if you're under
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pressure when stuff is happening that's
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something that is really important and
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something that I value a lot. The
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Journey Edition has also got improved
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battery life, and frankly, who doesn't
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like that? It claims that it's got up to
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60 hours, which is an awful lot of
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diving, even when you do them as long as
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I do. Another interesting thing is the
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air integration, and that's one of those
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things that people absolutely love. So,
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the Perix 2 Journey Edition will allow
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up to four transmitters to connect, and
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that's something that I never had on my
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original. I'll be honest, it's not
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something that I'm particularly going to
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use, but obviously there's a whole load
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of people that will. The other thing
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that's not on the original is the
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vibration alerts, which on the Perix 2
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are programmable. They're obviously a
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great way of making divers aware that
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there's something in their computer that
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they need to look at, and they're not
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quite as intrusive as audio alarms,
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which can sometimes upset other divers.
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So, vibration alerts, a really nice
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touch and another great feature. The
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last one that I want to mention is the
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addition of a threeaxis tilted compass.
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Does that make a huge difference? Well,
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yeah. It just means it's going to be
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more accurate and that's got to be a
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good thing. So, if you're going to use a
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compass, you want it to be accurate. So,
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well done sheer water for moving that
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forward. Overall, then the Perix 2
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Bronze Journey Edition feels like a real
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improvement and an upgrade to my
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original Perex and that's why it's my
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new offboard computer of choice. Having
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said that, there are a whole load of
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things that have remained the same, and
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that's great because they're really
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important features. There's a ton of
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things that I could talk about, but what
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I particularly want to do is talk
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through five things I really like about
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the sheer water, and they're things that
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aren't necessarily always appreciated or
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understood by everybody. So, what I'm
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going to do is run through them now.
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Hopefully, you'll find something of
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value to you. And what I would say is if
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you think there's a feature that I've
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missed and I should have talked about,
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then uh stick it in the comments. I'd be
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really interested to hear what you like
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about them. The first feature that I'm
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going to cover is something that you can
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do before you get in the water. And that
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is dive planning. So you put all the
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information that is relevant to the dive
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into the sheer water and then you can
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tell it to run a dive plan and it will
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give you it will give you one. and it
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will give you your stops, your stop
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depths, uh any if you're doing open
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circuit gas changes, all that kind of
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stuff. And if you want to, you can
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transfer that onto a dive slate and take
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it in the water with you as a backup.
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You can also run what if scenarios, you
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know, what if this gas isn't available?
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What if I change to that gas? What if I
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do a bit longer or a bit deeper or
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whatever it is? And you can do all of
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this on the surface before you get into
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water. So, that's a fantastic feature.
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Well done, Sheer Water. The next one is
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probably not quite as useful, but
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definitely really interesting and it's
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not something I think that necessarily
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people are aware of. So, what it is is
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that the sheer water will show you the
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exact breakdown of decompression stops
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that you need to do. You can see exactly
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how long you are going to be at each
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depth all the way back up until you get
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to the surface. So, you know, that's
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kind of interesting, even if not quite
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as directly useful as the previous one.
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Number three, though, is something that
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is really important and really useful,
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which is that with your sheer water, you
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can change your breathing gases
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underwater on the fly. So before you go
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in the water, you can have five closed
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circuit gases programmed and five open
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circuit gases programmed. But that
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doesn't really cover the scenario that
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say another diver has a different
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breathing gas to one of the five that
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you put in and for whatever reason you
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need to use their breathing gas. So what
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you need to be able to do is change this
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underwater and then your computer to
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modify your dive plan, modify your stops
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and all those kind of things. And that
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is exactly what the sheer water allows
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you to do. So you can sit there, you can
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change your gas that you've got
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programmed in and then say this is what
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I'm breathing now and the sheer water
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will take that and run with it. So that
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is obviously super super useful. Right
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on to number four then. And that is uh
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gradient factors. I think most people
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know that gradient factors are a way of
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modifying the conservatism of the dive.
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So, if you want to stay underwater and
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do more decompression stops, you have a
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conservative set of gradient factors. If
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you want to get out the water quicker,
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then you have a less conservative set of
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gradient factors. Now, before you get in
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the water, you will obviously program
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whatever you want into the computer, and
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then you're doing the dive. But let's
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say something happens on the dive and
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you decide you want to either be more
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conservative or you want to be less
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conservative. Well, the great thing is
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that the sheer water allows you to
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adjust the gradient factor whilst you're
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actually down there. And therefore,
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let's say for instance, you have bailed
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out and you are concerned that you might
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not have enough uh breathing gas to do
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your full stops and you're willing to
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accept a greater risk of decompression
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illness um to mitigate the risk of
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running out of diving gas. Then what you
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can do is you can change the gradient
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factor high from say let's say you had
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it at 70 or 80. You could change it to
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90 or 95 and that would get you out of
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the water quickly while still or quicker
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while still you know giving you an
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element of uh mitigation or you know
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risk control over the risk of getting
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decompression illness. And the last one
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is the one that you'll see me doing on
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pretty much every dive, which is to
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change the P2 underwater so that it can
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match the P2 on my rebreather. And I use
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that to accelerate my decompression.
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It's another awesome feature of the
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sheer water. And the great thing about
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it is that the sheer water will just do
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everything on the fly. So it will
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calculate your decompression profile. It
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will also calculate all the other stuff
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that you need such as CNS and it just
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presents it to you absolutely
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seamlessly. So that is another super
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useful feature. And I've now told you
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the five things that I particularly
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love, but there's a whole load of other
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things and I'd be really interested to
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hear from you how important those are to
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you. So for instance, one thing that's
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really cool is the configurable middle
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row. So different people like to put on
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different things on there depending on
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what's relevant for their sort of
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diving. Some people like to see gradient
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factor 99 or the delta or whatever else
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it is. But that's a that's another
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fantastic feature. Other people really
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like the rate of ascent indicator.
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That's the yellow or red just to the
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right of the current depth. There's also
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that lovely thing. If you go slightly
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higher than your decompression stop, it
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will give you either a red or a yellow
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indicator that you need to go back down
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again. Another thing I think that needs
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to be talked about is the app. So, you
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can upload your dives from your sheer
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water onto an app on your phone. It will
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sync with the cloud desktop. It's a
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great way of keeping your dive logs and
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also allows you to interrogate them and
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see all the information in there. So,
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another fantastic feature. And I've not
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even touched on open circuit modes.
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Haven't talked about recreational mode.
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Haven't talked about the technical mode.
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Both of which are extremely strong and
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extremely capable in their own right,
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but not really something that I use very
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much of. So, if you've got a favorite
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feature about the sheer water, any of
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the sheer water computers that you like,
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then please stick it in the comments.
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I'd love to hear what they are. But I
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hope you've enjoyed my favorite features
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of the sheer water. I mean, the simple
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fact is all the sheer water range of
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dive computers are really good and
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strong in their own ways. But the
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Journey Edition, the Perdict 2 Bronze
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Journey Edition has taken that to a next
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level. It's now my new offboard dive
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computer of choice. You're going to be
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seeing a lot more of it on my videos. If
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you've enjoyed this one and you want to
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watch some of my other ones, I've got a
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whole load more about different types of
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technical diving equipment, some tips
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and tricks that work for me. Otherwise,
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if you could leave us a like, drop us a
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comment, use the hype system, whatever
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it is, that would be absolutely
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brilliant. Otherwise, I'm Dom Robinson,
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Deep Wreck Diver. Hope you've enjoyed
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this video, and I'll see you on the next
