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>BSAC Diving Officers Conference Having attended the British Sub-Aqua Club Diving Officers Conference on 4/5th December I came away deciding that after 6 years of attending that this was the last. Why?. I can only re-afirm the comments in Steve Millard's posting. Despite bullet proof reasons for the use of Nitrox as the first choice gas for normal recreational diving we still recieve ill-informed comment from what are knowledgable people. Yet privatley many of the opponents agree that it should be used!. Like the instructor who stated that he always uses Nitrox when teaching/examining rescue skills tests!, or the facility that were approached by an instructor who wished to hire a Nitrox cylinder - without any ID labels!. I could go on for hours. It would appear that the BSAC are still attempting to re-invent the wheel and claim that the idea was theirs in the first place. As far as rebreathers go, in particular the CIS Lunar MK4, I have been fortunate enough to be able to dive the unit. Where do you start?. Real time decompression software. Diver variable PP02, this can be altered underwater and the rig will susequently recalculate any alterations to the decompression penalty. The unit can recover from a full flood without contaminating the scrubber stack ( can't say too much on that one - top secret!). Bale out options include a straight bale out to open circuit - without removing the mouthpiece. Off board gas supplies can be accessed and breathed either closed or open circuit.Diluent changes can be effected and the software will re-calculate once the diver has switched and inputed the change to the computer.Total manual operation can be done - even with a complete electronics failure.This includes oxygen and diluent injection and monitoring the PPo2 via 3 independant passive sensors. Head up display monitor lights indicate PPo2 warnings,deco,battery life and will all flash a 'wake up' call at a fixed interval .All in all a pretty awsome unit. I have also seen the Oceanic unit (heliox version). Nice unit, but I have my own reservations regarding some aspects of the design. The split counterlung concept is not new and was designed to address static lung loading. Having both the inhalation and exhalation bags behind the diver does little to address this. Unless things have changed, the decompression computer was a table look up unit with a fixed PPo2 (ppo2 set at surface) which obviously is not as efficient from a decompression point of view as a real time unit. But if anybody has any uptodate info I am sure they will post it Chris
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