Frankly, I have no interest in developing the ability to answer such questions. If I'm expending what few brains I have on memorizing/knowing such details, I will not have any left over to actually ENJOY the dive. I've got no interest in being a human data recorder at all.
If you (and others) get enjoyment out of such things - more power to you.
It doesn't an inordinate amount of attention.
It's little different than when a police officer says "do you know how fast you were going?"
Does it take your focus off driving to be aware of what your gauges are telling you and have told you? I don't think so, at least not after one has been driving for a few years. Diving is no different.
Just don't try it drunk/narced and expect good results
anyone can take notes (I remember having a slate in a few rec. classes and making notes), its just not standard procedure for multi-level dives in NDL profiles for most divers outside of a few training dives were your instrc. is going to drill you, most of us use a dive computer. Again technical diving is another thing.
I agree, but the OP asked "
Is there any system people have when diving multilevel to keep up with all the depths and times, and another member asked "
Ok how? how do you keep track of the various depths and times at those depths?"
That question isn't covered in any 'basic' training I'm aware of. Sure, most of us use a dive computer, but since the question involves preparations for that computer to
fail, "use the computer" doesn't seem like a good answer.
AFAIC, the answer is either:
1. Carry a redundant computer,
2. Make notes of your profile, or
3. Pre-plan the dive, and accurately dive the plan.
If you choose 2, you can either:
A. Do it in your head, or
B. Write it down.
Personally, I find 2A to be far less cumbersome than 2B. If either takes your attention off what you are doing (diving), opt for 1. 3 is next to impossible for anyone at an unknown dive site, and doesn't take into account extenuating circumstances.