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Using the (PADI) tables to do a solid 20 minute air dive to 100ft. and ascending directly or...
Using a computer to do 19 minutes at 100ft. then ascend partially till more NDL time registers on the computer, maxing that out then ascending till more NDL time registers etc... thus surfing the NDL's and stretching a 25 minute dive into a 40 - 60 minute dive? You could probably use a wheel to multi level plan in the same way but not to the same degree.
It's a way I've noticed that one can "stuff the bird completely" by using a computer
and (theoretically anyways) makes a computer less safe (or does it?).
Depends on the computer and how you set it.
The Galileo (With a micro-bubble level of "1"), for example, will only allow 13 minutes @ 100' on air. A longer stay will make it add deco stops.
Terry