Quote Originally Posted by Nitrogenius  View Original Post
Well handling of unit in zero viz and cave environment comes to mind


You don't know what you don't know comes to mind..


Given all the above asking for a requirement of a CCR cave card does not seem to be that "odd".. especially from an owners perspective that might encounter liabilities with your diving..
Good post. I would add mixed team diving (CCR's with OC's) in regular and bailout scenarios, as well as emergency procedures in mixed scenarios (same cave, not same team).