Buy an modern computer and use your old one for a back up. Ten years is ancient in terms of technology.
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Why an OCi? Old technology screen, old algorithms, difficult to download.I realized today it's actually 11 years old. I am going to buy a new OCi and keep my current OC1 as the backup.
The problem with a unmounted spare console is that the computer won't have your current nitrogen and O2 states. To be safe, at minimum you'd have to skip any remaining dives that day along with aborting the current dive if the failure happened mid-dive.
The easiest way to avoid this without having to lug around a clunky console on all your dives is to carry a backup computer. And maybe add a small backup SPG that clips off to a hip d-ring as Tursiops suggested.
Any basic nitrox computer would do if you add the SPG. Otherwise you'll need a spare that is AI compatible.
Which reminds me, I have an OC-1 in excellent condition that I've been meaning to sell. I'll send you a PM.
I would bet that if you went to the shop and said you will buy another if they free update both of them to seal the deal,,,, they would do it with a smile. familiarity is important ans so is both computers working the same as far as settings conservatism and algorythms.Because I've been using an OC1 for the last 11 years, I'm used to it. I don't download data. I found out that my old transmitter will work with it, but I'm wondering if I should also get a new one.
There is no update to the OC1 or the OCi, unless you mean a new battery or something.I would bet that if you went to the shop and said you will buy another if they free update both of them to seal the deal,,,, they would do it with a smile. familiarity is important ans so is both computers working the same as far as settings conservatism and algorythms.