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Jim I agree with your other points that I have snipped but have some views on your points on the pressure gauge: > -How do you check the pressure of your pony while underwater? > -If you use a gauge, how do you have the gauge rigged? Why put a pressure gauge on the pony cylinder in the first place. This is a point of failure. Gauges are only needed on stages if they are breathed to thirds - you have to know the contents to know when to stop breathing from them. BSAC train the following practice. Breath your primary supply down to the reserve level (i.e. the pressure at which you planned to be back on the boat), then switch to the backup supply (pony in this case). This ensures that the reserve in your primary remains intact at this point and that the correct functioning of the pony is confirmed. Once on the pony it can be breathed down until breathing resistance is felt and then the switch is made back to the primary supply reserve. The need for a pony pressure gauge is even more reduced if the diver adopts an incorrect procedure and breaths the primary dry before switching to the pony - you either have enough gas or you don't - a pressure gauge really doesn't help. The pressure gauge on the pony is a comforter and nothing else! Now, just to counter my own point: I guess a poorly trained, poorly configured recreational diver (a Scubie Doo) may feel a bit aghast at the idea of doing a regulator switch or two in a stressed situation and even more aghast at not having the comfort of knowing the pony pressure. David Shimell Project Manager, Sequent Computer Systems Ltd, Weybridge, UK Email: shimell@se*.co* -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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