From what I can tell, most of the agencies use the 200ft rule. At least I know for sure that NACD and NAUI do and I saw some others last night, I just can't remember for sure which ones. As far as the definition, it seems that NAUI did define it by saying:
Diving in the area in an underwater cave that is illuminated in part by natural sunlight and from which an emergency swimming ascent is possible.
I notice you highlighted all sorts of stuff but failed to highlight the part that says illuminated in part by natural sunlight. To me that's pretty clear, it says in part, not direct sunlight or within sight of the exit but IN PART
Check out what these divers had to say. You're right, I don't have a long history of diving, actually it's extremly short. I do however go to people with much more experience than me for guidance and advice. I don't do anything blindly. Now if you are not comfortable with being away from a visual of the exit, don't do it. I see that you say you have completed either Intro or Basic, don't remember which or which agency, that's awsome and I wish you the luck. You wanted to say that me/my instructor should change our definition of "daylight zone", I could say the same to you. I however have been able to back my definition up with at least an excerpt from NACD, since you don't like the wording of NAUI's definition. I have yet to see you post anything that states other wise except for a quote from someone you know on the board, unless I missed it and if I did, I'm sorry. As I said before, I'm sorry we're at an impass.
Daylight zone/natural sunlight
Diving in the area in an underwater cave that is illuminated in part by natural sunlight and from which an emergency swimming ascent is possible.
I notice you highlighted all sorts of stuff but failed to highlight the part that says illuminated in part by natural sunlight. To me that's pretty clear, it says in part, not direct sunlight or within sight of the exit but IN PART
Check out what these divers had to say. You're right, I don't have a long history of diving, actually it's extremly short. I do however go to people with much more experience than me for guidance and advice. I don't do anything blindly. Now if you are not comfortable with being away from a visual of the exit, don't do it. I see that you say you have completed either Intro or Basic, don't remember which or which agency, that's awsome and I wish you the luck. You wanted to say that me/my instructor should change our definition of "daylight zone", I could say the same to you. I however have been able to back my definition up with at least an excerpt from NACD, since you don't like the wording of NAUI's definition. I have yet to see you post anything that states other wise except for a quote from someone you know on the board, unless I missed it and if I did, I'm sorry. As I said before, I'm sorry we're at an impass.
Daylight zone/natural sunlight