I have asked my instructor and each time(2 times) i got a very basic answer as to why and what the reason for it was and was told since we are not going beyond or NDL that these stops were just for added safety, for this reason and some others i no longer use this instructor and im looking for a GUE instructor in my area to teach me the Fundamentals course and more, i was certified in 1984 at the age of 14 and then after only a few dives here and there at that age i quit till i turned 20 and started to dive more often and was careless in my approach, i dove alot of dives that were not safe and down to 100fsw with other divers who's approach were equally as bad, now at my age i have returned to diving which i love and through a friend found an instructor to complete my Advanced Open Water, as it turns out as an instructor this person seriously lacks the "educational" communication part of teaching, I cannot move forward in my diving approach until i find a new instructor whom i can ask lots of questions and get a real understanding of the science so to speak of certain elements such as gas consumption, deco stops, etc, etc. I have only 1 dive left with this instructor and that is a navigation dive, i have a list of questions and then im done with this instructor and will be looking for a GUE instructor near me, thanks.