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Ganglandboss

7,163 posts

91 months

[news] 
Sunday 7th October 2012 quote quote all
I have one of these - a Heinrichs Weikamp OSTC 2n:



It is an awesome bit of kit! It is open source so if you are inclined to do so, you could write your own deco program. It allows you to set five gas mixes of any combination of oxygen, helium and nitrogen and a sixth you can enter underwater. The two buttons on the side are really easy to use under water.

The display is really bright underwater and it recharges by USB. It uses the Buhlmann Z16 deco model and you can adjust the gradient factors. It is also compatible with closed circuit rebreathers as well as having an apnea mode.

It is way OTT for most recreational diving and the UK distributor, Deep Ideas, advise it is only suitable if you have an understanding of decompression theory.

I also have a Vyper Air, which was my first computer. I dive with the OSTC as my main computer and have the Vyper Air set in gauge mode as a bottom timer.

A feature to look out for is the ability to gas switch. If you ever do accelerated deco, it will calculate your deco time when you switch to a richer nitrox mix. The Vyper Air has this facility but I'm not sure of all the other Suuntos that do.

If you don't want to do the techie stuff, the Zoop is a very good choice.

Silver993tt

8,574 posts

127 months

[news] 
Sunday 7th October 2012 quote quote all
Ganglandboss said:
A feature to look out for is the ability to gas switch. If you ever do accelerated deco, it will calculate your deco time when you switch to a richer nitrox mix. The Vyper Air has this facility but I'm not sure of all the other Suuntos that do.

If you don't want to do the techie stuff, the Zoop is a very good choice.
Zoop handles nitrox also.

Ganglandboss

7,163 posts

91 months

[news] 
Sunday 7th October 2012 quote quote all
Silver993tt said:
Ganglandboss said:
A feature to look out for is the ability to gas switch. If you ever do accelerated deco, it will calculate your deco time when you switch to a richer nitrox mix. The Vyper Air has this facility but I'm not sure of all the other Suuntos that do.

If you don't want to do the techie stuff, the Zoop is a very good choice.
Zoop handles nitrox also.
Can it 'gas switch' though? A basic nitrox computer will let you set a single nitrox mix (for example, you many be diving on a single cylinder of EANx36 to extend your no decompression limit. The Vyper Air will let you set two mixes which can be switched on the dive. You may be diving on air or weak nirtox at depth and then switch to a richer mix as you ascend to speed up your deco.

There is no point having this feature if you are only ever going to stay within no decompression limits but when buying kit, it is a good idea to ask yourself what sort of diving you want to be doing in a couple of years time.

marcosgt

7,632 posts

64 months

[news] 
Sunday 7th October 2012 quote quote all
Ganglandboss said:
Silver993tt said:
Ganglandboss said:
A feature to look out for is the ability to gas switch. If you ever do accelerated deco, it will calculate your deco time when you switch to a richer nitrox mix. The Vyper Air has this facility but I'm not sure of all the other Suuntos that do.

If you don't want to do the techie stuff, the Zoop is a very good choice.
Zoop handles nitrox also.
Can it 'gas switch' though? A basic nitrox computer will let you set a single nitrox mix (for example, you many be diving on a single cylinder of EANx36 to extend your no decompression limit. The Vyper Air will let you set two mixes which can be switched on the dive. You may be diving on air or weak nirtox at depth and then switch to a richer mix as you ascend to speed up your deco.

There is no point having this feature if you are only ever going to stay within no decompression limits but when buying kit, it is a good idea to ask yourself what sort of diving you want to be doing in a couple of years time.
No it can't. Only the viper air and up can.

M

Doofus

2,708 posts

61 months

[news] 
Sunday 7th October 2012 quote quote all
Mogsmex said:
I love my Citizen promaster,

Ahh, the fabled 'underpants' watch... wink
Advertisement

Silver993tt

8,574 posts

127 months

[news] 
Monday 8th October 2012 quote quote all
marcosgt said:
No it can't. Only the viper air and up can.

M
I meant it handles Air & Nitrox, which will be more than the OP requires as he wants a basic dive computer for recreational diving.

marcosgt

7,632 posts

64 months

[news] 
Monday 8th October 2012 quote quote all
Silver993tt said:
marcosgt said:
No it can't. Only the viper air and up can.

M
I meant it handles Air & Nitrox, which will be more than the OP requires as he wants a basic dive computer for recreational diving.
Ah, got ya smile

It'll certainly suffice for most divers - I know people with hundreds of dives all over the world who happily dive on low end Suuntos.

M

mel

9,880 posts

163 months

[news] 
Tuesday 9th October 2012 quote quote all
thegman said:
My suunto once fell off my dry suit in very poor conditions. Luckily I found it but I guess it pays to have a watch as backup.


Only if you've memorised your tables, otherwise all you know is what time it is.

alfaman

5,066 posts

122 months

[news] 
Tuesday 9th October 2012 quote quote all
Doofus said:
Ahh, the fabled 'underpants' watch... wink
care to explain ? [was the underpants bomber wearing one ? ]

..or am I way off .... ?

Doofus

2,708 posts

61 months

[news] 
Tuesday 9th October 2012 quote quote all
alfaman said:
care to explain ? [was the underpants bomber wearing one ? ]

..or am I way off .... ?
It's not "fabled" as such, insofar as I'm the only person to call it that.

Watches seem to get nicknames based upon certain characteristics - Zenith Panda, Seiko Tuna, Orient Mako and so on. I call these the 'underpants' because of the pair of underpants proudly sported on their dials biggrin



marcosgt

7,632 posts

64 months

[news] 
Tuesday 9th October 2012 quote quote all
mel said:
thegman said:
My suunto once fell off my dry suit in very poor conditions. Luckily I found it but I guess it pays to have a watch as backup.


Only if you've memorised your tables, otherwise all you know is what time it is.
Surely you plan your dive and know how long you intend to stay down for?

You should be able to dive without a computer. Hardly requires memorising tables, just know your bottom time at the depth you plan to dive to.

More complex with gas mixing and multilevel dives, but for most dives a watch and a depth gauge should be enough.

M

Zod

27,174 posts

146 months

[news] 
Wednesday 10th October 2012 quote quote all
Yes, you should be able to dive without a computer and use tables (I carry a waterproof one in my BCD, just in case), but computers are much more flexible (they can even cope with a dive with more than one deep descent!).

I'm still using the Suunto Mosquito I bought in 2001. It's done a few hundred dives and gets a new battery once or twice a year.

stuttgartmetal

6,849 posts

104 months

[news] 
Wednesday 10th October 2012 quote quote all
Table use, you're up in twenty minutes.
Great

Ganglandboss

7,163 posts

91 months

[news] 
Wednesday 10th October 2012 quote quote all
DIR divers ( Doing it Right - Wiki link for those not familiar with the term) do not use a computer at all for a number of reasons but say that they are actually more conservative than other methods of calculating deco.

A large number of dives are not square profiles so your average PADI trained recreational diver will get spanked if they use the Recreational Dive Planner for a multi level dive. For a recreational diver, a simple computer gives the freedom to just jump in and explore and there is nothing wrong with doing that.

I always dive with a computer and a bottom timer (my Vyper Air in gauge mode). I can cut a dive plan off my computer (OSTC 2n) and copy it into my wet-notes or I can calculate my deco underwater using the ratio decompression method. Both these methods can be followed with a simple bottom timer. On deeper extended range dives, you should always have a back-up of either two bottom timers, two computers or one of each. For most recreational divers, one computer per diver in a buddy pair is fine.

marcosgt

7,632 posts

64 months

[news] 
Wednesday 10th October 2012 quote quote all
stuttgartmetal said:
Table use, you're up in twenty minutes.
Great
Depends which tables you use...

M.

troc

1,549 posts

63 months

[news] 
Wednesday 10th October 2012 quote quote all
I can't help feeling I've fallen through a trapdoor into http://www.yorkshire-divers.com/forums/computers-d...

biggrin

marcosgt

7,632 posts

64 months

[news] 
Wednesday 10th October 2012 quote quote all
You didn't drink the red drink did you? smile

M.

shambolic

967 posts

55 months

[news] 
Wednesday 10th October 2012 quote quote all


Mine

shambolic

967 posts

55 months

[news] 
Wednesday 10th October 2012 quote quote all
Ps as said above perfect for 99% of recreational diving, has altitude settings, profile settings , and nox or air settings. Really easy to use, decent display under the dark gloomy Scottish Lochs.
Although at 27m on Sunday I couldn't seethe end of my nose without my torch never mind my computer!
smile

shambolic

967 posts

55 months

[news] 
Wednesday 10th October 2012 quote quote all
Pps the zoop has a handy easy to use Plan setting for after first dive you get your surf time then just hit plan and time which sets the bottom time depending on depth selected. You can then set alarm etc for that depth if you want.
As said above no dive is straight down to 20 m and straight up so computer takes that into consideration.

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