Quote: (Originally Posted by
Drmike)

Turn time is governed by when you reach limit of bail gas your carrying* or when you reach 1/3rds of O2 or dil (or whatever gas planning ratio your using) - whichever comes first.
*before dive you estimate max penetration distance given the bail gas your taking
Mike
Thats how I was taught on my course with Bruce Konefe in Thailand. Only asking to understand some other methods and the reasons.
John