spoolin01
Contributor
No, I see no value to it for rec diving, other than amusement between dives.
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Hmmm, I use my SAC rate to figure out how narced I am. As I get closer to 100 feet, I make sure I calculate my current consumption rate by taking 5 minute PSI readings and the calculations generally go something like this:
a. Depth -- 100 feet
b. ATA -- 4
c. Pressure 2475 psi -- minute later 2200 psi -- that is 275 psi used
d. Uh, what was I doing? Oh, right -- depth 100 feet. Uh, How many psi was it? Uh, uh, uh...
If I can do the whole calculation, I know I am either on trimix or I am NOT at 100 feet!
I calculate my SAC, but assume 1.0 for gas planning. Unfortunately, I know that my working SAC is above 1.0, so it's sort of like I calculate it only to ignore it. All my buddies have casual SACs of 2/3 or less of mine, so I assume that their working SACs are also 2/3 or less of mine (I know that's not a great assumption), but that comes pretty close to 2.0cf/min.atm for the pair of us.