NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Gyroscope vs. Fluxgate compass
From: John LeRoy
Date: 2002 Feb 5, 13:37 +0000
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