MichaelMc
Working toward Cenotes
Quoting the OP first sentences:
So 5' primary, necklaced secondary is what they are asking about.
(I dive a long hose as a recreational diver; I like it better for air shares and like having my backup right under my chin. I've done neither tech training nor dives.)
I am leaning toward a primary reg on a 5 foot hose, coupled with a necklaced secondary. I am favoring the "primary donate" method for sharing air, where I donate my primary and then switch to the necklaced secondary.
So 5' primary, necklaced secondary is what they are asking about.
(I dive a long hose as a recreational diver; I like it better for air shares and like having my backup right under my chin. I've done neither tech training nor dives.)