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    Re: Gyroscope vs. Fluxgate compass
    From: Brian Whatcott
    Date: 2002 Feb 5, 12:11 -0600

    At 12:55 AM 2/5/02, you wrote:
    >on 2/1/02 11:25 PM, Brian Whatcott at inet{at}INTELLISYS.NET wrote:
    > > Instead, bigger airplanes used a flux gate sensor to drive a 'slaved' gyro.
    > > (This may be implemented as the compass card of a Radio Magnetic
    > > Indicator ("RMI") or lately as a Horizontal Situation Indicator ("HSI") or
    > > currently as a compass card surrogate depicted on the
    > > CRT or LCD or Plasma display of a "glass cockpit".)
    >Actually on modern "big" airplanes like the747-400 I used to drive the
    >navigation system has no magnetic compass at all!
    >John LeRoy
    >M/V Traveller
    If I'm not mistaken, the 747 carries a magnetic compass like any other
    passenger carrying airplane on the American register.
    It's found at front center of the windshield.
    Just in case the traditional navigation system needs to take over?
    Brian Whatcott
       Altus OK                      Eureka!

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