I used to dive the commander and yes it always gave very long deco times. and yes, I've left it hanging on the end of cave string to do the deco on its own! I quit diving it cause it never agreed with any other computer by a long shot. Then it began to disagree on the current depth and time at depth (once I really got to comparing it). I tried to talk to cochran about it, but they were so unpleasant and offensive to deal with I vowed to never buy anything from them again.

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