ok, onfloat. The place where you did your last class, lets skip the name. Those guys take divers on air to the Sea Tiger everyday and they are the local DIR shop, I just was trying to figure out how thay do all the things they do and still .... see? I am not trying to make a problem it is just that every "DIR" diver I have ever known has one set of what they "say" and then they either solo, or use computers, or take divers that have 10 dives to very deep dives on air as part of their business/income model. I do not want to discuss said shop, but I am laying out an example I know you can follow because I think this is the real mystery to people like Dennis and I with DIR in general. I know PADI is much worse so I am not being critical. Just trying to "get it". There are certain things I want from DIR divers.
Having said that, I wish divers experienced with thinking the tables through on every dive and making adaptations for multilevel, changing dive plans would explain the nuts and bolts of how they do this like what has happened in this thread and the "mother thread" as SB, Thal, Onfloat, jeff have done. Even Charlie's 100 psi per 10 is very helpful and frankly, I have never heard this before. I know it because I do it...but the "news you can use" angle does not happen enough around here and I wish there was more of this. Even if you disagree with someone's approach, I still learn quite a bit from a guy who decides to run an excel spread sheet and demonstrate how he thinks his planning through.