captain
Contributor
Depending on the depth of the dive I may or may not carry an SPG only a J valve and I did not say I don't use doubles. If it's a 100 foot dive with doubles I will reach the NDL long before the duration of my air supply. Self contained diving is all about gas management and I agree that an SPG is a back up for gas managenent skills. I
was diving for many years before SPG's came into common usage and that gave me a lot of experience and insight in gas management.
Captain
was diving for many years before SPG's came into common usage and that gave me a lot of experience and insight in gas management.
Captain