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    Re: Learn the stars, by phone
    From: James N Wilson
    Date: 2009 May 14, 10:51 -0700

    Your discussion of problems with compasses reminded me of an ancient
    experience--putting a compass in a tank. I headed a team to advise the
    army, and they were looking for a more modern way than the existing one:
    the tank commander stopped the tank, got out and walked fifty feet away
    and read his hand compass. They had been sold on a scheme which had an
    aircraft fluxgate compass on a fender, but it was awful. Deviation of up
    to 300 degrees! I couldn't believe it. The only way it worked was with
    the tank stopped on level ground pointing north. Not very utile.
    A general asked me could GPS be used to get a heading. I asked our JPL
    navigators about that, and they came up with two schemes that could do
    the job. Of course, that's common now, and a lot more.
    Jim Wilson
    Digital Photography - Click Now.
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