hi there
good question.....before i did it i just thought that they were the same thing but the national geo. a bit more posh. but i ll explain now that i know. you can do the national geo insted of your open water course so it can be the first course to certify you as a diver. but if you are already a diver the difference is that i think personally taht its better than the ppb course, due to you doing more skills to help you on your buoyancy, skills which will come to better use than the ppb, doing different hovering...horizontal, head first, feet first. sounds easy and its nothing too taxing but its really good to just learn a few hints and tips. you also do a mapping exercise and some navigation as well.....more things.oppotunitys to different levels of experience so if your fab at navigation then your not just going to get a square for exmaple. hope this helps with your question. i can t gartenee that this will be the same for all centres but it was a success with sue and steve
