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If I was to run a single HP 100-120 with a pony, are you saying to ditch my necklace from the HP tank, and have my necklace connected to the "pony" tank so I would still only have 2 regs instead of 3?
The debate really is if you are a single tank and octopus rigged diver. This arrangement offers no redundancy and is not suited to solo diving. An additional source is needed. The term "pony" generally means a small (often too small) tank back mounted. That is why I like the term bailout better. Bailout is to bail you out in moments of need. A back mounted small tank can - under some circumstances - be adequate and indeed ideal for solo explorations. Ice diving is a really good example of this. The diver should IMHO remove the octopus as it is not needed - there is no buddy to donate to. If you have a gas issue swap to the bailout - ideally necklaced so you cannot lose it.
The problem comes when you combine a bailout with an octopus and an buddy that might not be familiar with such configurations. You can invert the bailout and run the AAS from it, removing the second 2nd stage (octopus) from the primary regulator. This gives the best of all worlds. The valve can be accessed to turn off the bailout in a free flow, the AAS is available for the buddy as usual and the diver can self-rescue with the bailout. I would recommend this configuration to anyone wanting to have a standardised approach to both buddy and solo diving (such as a DM).
Here is my Question,
As a relatively new diver 30-40 dives in looking to go Solo EVENTUALLY,
I dive SSBP/w long hose with neklace,
If I was to run a single HP 100-120 with a pony, are you saying to ditch my necklace from the HP tank, and have my necklace connected to the "pony" tank so I would still only have 2 regs instead of 3?