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In what way is that "located in the triangle formed by your chin and the corners of your rib cage"?
I can see it leading to an OOA diver resorting to snatching your primary out of the owner's mouth.. and them not being able to easily reach back and grab it for themself.
I see it getting snagged on anything snagable.
I see it dropping out and the diver not noticing.
I see it sparking a lecture on 'proper diving practices' from every DM on every dive boat the diver books onto.
I see it leaking and draining air, without the diver noticing.
I see it getting damaged, without the diver noticing.
If someone was happy to use this, they could just save the money spent on a second-hand inner-tube and stuff the thing into a BCD pocket....
Necklace... that's what I would recommend to anyone who asks the question. In all sincerity I can't think of a good reason not to have a necklace for the second.
Agree, but under the caveat of "long(er) primary" for donation. That isn't necessarily what is being taught though...
Hmm not too sure. How easily does it deploy? how visible is it to another diver when you are wearing BC?
Make your own necklace using bungee cord & a zip tie, or just bungee. The Internet, inc. uTube if full of instructions.
HUGELY better solution.