First I want to thank everyone that provides input to this forum. I trust the knowledge and advice given here over a magazine review any day. My questions: I have read numerous posts here and have decided on the Suunto Cobra console or the Vyper Wrist mount. I am getting a mixed review of the type of mount that is best. I understand that a wrist mount is good if you travel (which I do), but typically my regs would be going with me along with the console. So, how does the computer know how much air is left on the non-air integrated computers? Thanks again.