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
