dumpsterDiver
Banned
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Probably depends on the person. Some would rather save the money and do some simple algebra. Others would rather spend the money and not do the simple algebra.
That said, I've yet to see a gas integrated computer that will signal to ascend before your buddy is too low on gas to get you to the surface.
I think it would be easier (and more in keeping with agency methods) to publish tables of gas reserves required at various depths. "Slide your finger down to you and your buddy's combined consumption rate, slide your finger over to your depth column."
I'm confused as to why you think a manual table and a sliding finger would deliver better data than a dive computer, particularly with regard to gas supply and instantaneous breathing rates.
I'm not saying that a beeping computer will save people (from themselves), but as training continues to get dumber and computers get cheaper and smarter, there might be an intersection of cost/benefit that might provide divers another tool. Sorta like the idiot light on your car that goes off when your gas gauge also reads low on fuel.