captain
Contributor
boulderjohn:Interesting idea. Let me see if I am understanding this right.
It could be a log book page with a list of conditions and a place for an instructor or DM to sign off on next to it. It would have no official, legal status, but would serve primarily as a reminder to the student that all conditions are not created equal.
Some logbooks have pages similar to this in which the diver periodically provides the total experiences for certain kinds of dives, although I have not seen one for this sort of thing. Perhaps in lieu of a signature, which really wouldn't mean much, the diver could occasionally summarize the total experience in each category.
If you wanted to do it in a more formal way, cert agencies could have their own stamp which could be placed either in a log book or on the cert card itself similar to the way the U S water fowl hunting stamp is placed on the hunters license.