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| Originally Posted by MattS surely a pony or octo is an 'Alternate' air source as you would go to it in turn after the main failed. |
Only if you were planning to switch backwards and forwards between it and the main. Which would be pretty silly under the circumstances
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But a backup reg on a twinset would be an 'Alternative' air source as you have the choice of two.
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Agreed. Unless of course you were diving independent twins, and swapping backwards and forwards between the two regs during the dive. Then you would alternate between the two
PS - quantum mechanics - I've never understood where they get the tiny tiny little spanners from
