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For the sort of diving I'm doing (30m to 40m with not much deco) then I think that back-up computers are overkill. Of course I would like one, but I don't think they're by any means a neccesity.
I only have one computer at the moment, (although I do have watch) and if I'm doing something extreme (for me) then I also take down some bail-out tables on me wet-notes
Consequently, if I do ever have two computers (and I would quite like a Vytec, but only after I've bought a new torch) then doing this sort of dive I would be quite happy to continue if one of them went tits up.
I think the big advantage of backup dive computers (for me) is when you're on a weeks holiday somewhere and one goes wrong and you don't want to wait 24 hours before diving again.
Obviously all this depends very much on the diving you're doing really.
Laters,
Janos
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