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    Re: Batteries for Quartz Watches
    From: Bob Trenkamp
    Date: 1996 Oct 01, 22:05 EDT

    --- Phil Kohl wrote:
     The thought is that if one
    is going to use quartz watches on an extended voyage, one should have spare
    batteries, the tools and know how needed to replace the batteries, and a
    time reference for resetting the watch after the battery is replaced.
    --- end of quoted material ---
    Phil,
    There's an alternative:
    I take several quartz watches and "rate" them - - i.e., I compare their time to
    a known standard such as WWV by radio or phone several times over the course of
    a few months. By plotting their error and drawing a visual "best straight line"
    through the points for each watch, I develop a graph for each watch that
    permits me, knowing the date, to very accurately convert the time read from the
    individual watches to GMT. One of these watches is always my Casio barometer
    watch, but often the others are "$1 each" or "2 for $5" watches I pick up
    whenever I find them on sale at the checkout counter.
    The battery on my Casio lasts for several years. Ditto that for the "dollar
    watches". If I ever had to replace a battery on one of these watches at sea,
    I'd either reset it to a WWV type signal (available from several sources all
    over the globe) or I'd use the GMT reading from the other watches to establish
    the real time. In any event, I'd start by aassuming that the new rate line for
    the watch would be the same slope as it was before the battery change.
    Regards,
    bob
    ps: if you're running a Mac, and if there's a UNIX server on your internal net
    somewhere, you can run a neat little app called "Network Time" that lets you
    synch your Mac clock with the NBS within milliseconds.
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