So... you have all of the formulae in ZHL-16 between your ears? That's rather impressive. Kudos.
If I were pushing the limits on 4 dives/day for 4 days straight and my computer died, what I have between my ears would tell me to not go on a dive that could put me close to the limits. You know, sit one out, enjoy the sun, have a beer, run ZH-L16 formulae on my laptop.