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    Re: Gyroscope vs. Fluxgate compass
    From: John LeRoy
    Date: 2002 Feb 5, 13:37 +0000

    on 2/5/02 6:11 PM, Brian Whatcott at inet@INTELLISYS.NET wrote:
    > At 12:55 AM 2/5/02, you wrote:
    >> on 2/1/02 11:25 PM, Brian Whatcott at inet@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?
    True, there is a whisky compass, but its not part of the navigation system.
    It is highly unlikely that the aircraft will lose both GPS systems and all
    three FMCs.
    John LeRoy

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