Don, I thought of something else worth mentioning about Suunto's RGBM computers. They use what they refer to as a Consumed Bottom Time graph instead of the more familiar nitrogen loading graph. It works basically as it sounds, it shows you how much bottm time you have consumed at whatever depth you happen to be at. That sounds all well and good, but the problem I've found with it is this. After you've been at say 100ft for a while and are getting close to your NDL, you decide you want to ascend to your safety stop. When you get to the safety stop, it shows you how much bottom time you have consumed at the safety stop depth, not how much nitrogen your tissues have loaded. So since you can spend an endless amount of time at 15ft, the graph will be blank and you'll have no reference as to how much nitrogen you have taken on. Course as long as you don't ascend until any stop requirements have been fullfilled, you're suppose to be fine. But I don't like suppose to's and I prefer a graph that calculates nitrogen loading instead. So I can stay at the stop until I'm well in the green, so to speak, before I ascend. Other than that I really like both my Cobra and my wife's Vyper. It's not a real big deal unless you push the limits, but if you frequently do, then I'd reccommend another computer.
