Re: 747-400 Magnetic Detectors

From:         "Dave Starr" <>
Organization: AT&T WorldNet Services
Date:         07 Sep 96 17:09:11 
References:   1 2
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The information on the Honeywell and Litton units is correct.  The Delco
Carousel can determine true north within 15 arc minutes (1/4 of one
degree), regardless of the accuracy of the initial present position entry.
This is done by comparing the signals from the two accelerometers (placed
90 degrees apart) on the rotating 'Carousel'  stable platform as they sense
the speed of the earth's rotation.  The rotation's all that's required for
a heading computation.