BM>The Advanced Open Water Certification class teaches night diving, deep 
divin
BM>(to 100 feet as NASDS members don't dive deeper than 100 feet), and
BM>navigation.
What is the reasoning behind NASDS members not diving past 100 feet.
And yes I do know about the physical aspects such as time constraints
and nitrogen build up.
But just wanted to know the logic as they explain it.
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