Posted by TDI_2 on May 08, 2002 at 14:47:23:
In Reply to: Re: Throwing your tables away is dangerous posted by tecdiver on May 08, 2002 at 07:17:26:
Try this rule, instead of tables, with your diving watch:
Let depth = X fsw
Then max time at Depth X = 120 mins - X mins
For depths of 115 fsw to 200 fsw, your max is a full 5 mins, including descent time. This obligates you to egression by halves, 1 min deco/safety at the first half, 2 mins deco/safety second half, 3 mins deco/safety third half, 5 mins deco/safety last half. That should bring you back fine from 200 fsw or less. Works for any gas, including air or nitrox or trimix. Just mind your PO2 depth limit as well if youre not diving air.
So, who needs tables now? At least not for the first dive. I hope you keep a square profile, or count your dive like you are on a square profile.
If you brought your tables, preferable US Navy or Canadian DCIEM (see any TDI manual for both), which NOBODY does, then you can compute your residual nitrogen when you're back on the boat and can then go back down, after the prescribed surface interval.
But its a whole lot easier just to stick with your buddy and HIS diving computer, LOL !!!
By the way, your PADI tables will only go to 130, unlike your PADI wheel which goes to 140. Same is true of SSI tables. If you're not tech, you dont belong below 100 anyway.