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> From: Phil Pfeiffer <phil@es*.ed*> > On Sun, 12 Mar 1995 4700gbera@um*.cc*.um*.ed* wrote: > > > OK, I'll ask another possibly silly question; if two (or more) divers in > > close proximity are using hoseless air-integrated computers, what prevents > > diver A from displaying info from diver B's sending unit, etc? PArticularly > > if both happen to have the same computer? I can easily get my wrist closer > > to a buddy's 1st stage than is his own wrist. > > The question is not at all silly, and I wonder how much attention has been > given, or needs to be given, to this problem by the manufacturers of > air-integrated computers. I can think of three solutions to the problem, > the first two probabilistic: > > A good summary of possibilities here. A question slightly off the subject: how do these computers communicate? Is it electromagnetic (unlikely in water - low propagation), magnetic (as used in swimmers heart-rate monitors, etc.) or ultrasonic? Jon Dr. J. Tapson email: jtapson@no*.ct*.ac*.za* Lecturer ph: (27) 21 460 3042 School of Electrical Engineering fax: (27) 21 451 698 Cape Technikon Box 652 Cape Town 8000
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