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All the points have been covered pretty well- I may just add this mostly useless bit of info, SCUBATOYS.COM has computers that can be used reliaby for a souple hundred bucks. Think of it as an insurance policy against having to sit out any dives due to electronic disagreement. I have the Mares RCBM (?) or something like that, it was 300 dollars and comes with a SPG and small console computer that is water activated and allows a cheap alternative tto tables and redundancy is king in diving.
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Scuba has one fundamental rule; Come up as many times as you go down.
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