Back up computer for rebreather or not???

[Alan Price.]

Right i have to ask, should i have a back up computer for the Vision Rebreather??
If so witch one is best and why.

At the moment my back up plan is the good old slate and i plan on sticking to it but is having a second computer a good idea??
If it is witch one & why.

If you have a second computer do you go by the vision or the "second computer" 

Any help lads & ladies would be great.

Safe diving,
Alan Price.

[soheil]

 back up computer or slate would not be any help if you leave them behind on the Wreck.
based on my research there is only two dependable computer,  VR3&Shearwater, take your pick.

[baza]

I dive with a vr3 along side the vison. I follow the vr3 mostly and run the vison as a backup. It works alot better than backup slates on deep dives... If my main computer when down I wouldn't want to b flickin through slates to find one that suited my profile on that dive.

Barry

[Stewart Andrews]

Well said deco-on-the-fly Baza... learnt from the worst, I see.
I agree - do the VR3, including deep stops. However, I never burst the ceiling on the Vision - until - well - about 100 minutes from the end - then I bust it completely.

[Alan Price.]

Ok lads looks like i have the idea now.
How much faster on say a 85 mtr dive with 2hr 30min run time would the vr3 be to the vision??? or is time only different on deeper & longer dives??
I had a vr3 for a longtime when i was diving the twins and was happy with it.

Rez we where leaving the slate there so yous could use it!!!  we had 2 

[pat coughlan]

I use a back up VR3 with the Sentinel (same algorithm) but what Baz said is true flicking through tables is trying to find a table suits is time consuming especially if you have gone open circuit and trying to get yourself out of depth fast, I do carry a set of tables laminated and cut for the gas I am using( I hope never to have to use them)

Pat

[baza]

The vison will get you out of deep water alot faster that the vr3. That said my ascent is slower than what the vr3 is asking for also which adds to ur overall deco. Both profiles tend to cross in the shallow section of the deco where I then start to follow the vision. This is normally around 20m or so. At the end of a 2 or 3 hour dive the vr3 will be clear 10 or 15 mins before the vision.

Barry

[Stephen McMullan]

I'm in the same position as Alan. I think the question has become a bit fuzzed. You're all talking about your normal diving procedure. However can I ask the horrible question of what the strategy would be if you lost the Vision computer - say no display, flood whatever. Would you stick to the VR3 in open circuit mode? Would you cut down the conservatism to minimal to get out quickly because of presumably limited gas (even on the drop line?) or would you have a specific bailout table (aggresive?) for that purpose? I know its an uncomfortable question but any suggestions appreciated.

[Stewart McMickan]

When you have a buddy like Rez, there is NO need for a back up computer.

[tonyf]

Hi Alan,
 I changed from a vr3 to X1.  The X1 is a great piece of kit.  But expensive.  I run Multi Deco.  This allows Gradent  Factors,  vpm b, vpm b/e and VPM fob ( Fast bail out) pick the one you want to use.  When you bail you can can run two models which run simultaneous.  You can select which one you want to use and change mid dive.  The unit can match the vision or be set to get you out of the water quicker.  The display is great and no need for back lights.  The unit is nice and small and does not get in the way.  I did alot of research before buying and was a toss up with the shearwater.  If I was going for a computer to plumb in then the Shearwater would have been my choice.  But as a stand alone computer Im very happy with the X1.





Tony

[Stewart Andrews]

I'm in the same position as Alan. I think the question has become a bit fuzzed. You're all talking about your normal diving procedure. However can I ask the horrible question of what the strategy would be if you lost the Vision computer - say no display, flood whatever. Would you stick to the VR3 in open circuit mode? Would you cut down the conservatism to minimal to get out quickly because of presumably limited gas (even on the drop line?) or would you have a specific bailout table (aggresive?) for that purpose? I know its an uncomfortable question but any suggestions appreciated.

Speaking generally, I use the VR3 all the way through the dive, right till the end (whatever that is!). I have seen the Vision give over 40 minutes longer than the VR3 on long dives. Therefore the VR3 is the one I would use for bail-out. Or from tables cut from V Planner - which gets you out of depth fast and is also reasonably agressive in getting you out of the water. I only carry tables for 100 and 120m - a bail-out from lesser depth - I'd probably just follow Baza up or raid his stock of laminated tables or something!!!

[Stephen McMullan]

Just a quick price comparison:

Liquivision X1 £1124.99
Shearwater Predator £882.90
VRX £849.00
VR3 £744.00
OSTC Mk.2 €679 (£598)

* All prices inclusive of VAT for OC/CC Trimix standalone mode only

[Stewart Andrews]

I only know one person with a VRX (he swears by it) and he's a bit of a nancyboy.

[Mister Mike]

Ok lads looks like i have the idea now.
How much faster on say a 85 mtr dive with 2hr 30min run time would the vr3 be to the vision??? or is time only different on deeper & longer dives??
I had a vr3 for a longtime when i was diving the twins and was happy with it.

That runtime would give me 37 mins bottom time with the vision , and a very sick (missed stops - use tables) VR3/VRX. Even if you match the gradient factors , the computers are still giving you different deco info and require different ascent times.

[Stewart McMickan]

I only know one person with a VRX (he swears by it) and he's a bit of a nancyboy.

?