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Damselfish:yep, I always want to have backups.
An AI computer does make things a little worse if you don't have your own backups, since you've lost more stuff. You can look at someone elses depth gauge to tell where you are, but you can't look at someone else's pressure gauge to tell what's in your tank!
If your regular computer failed but you still had an analog SPG you'd still have both depth (from your buddy) and pressure info.