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    Automatic deviation calculation by electronic compasses
    From: Joe Schultz
    Date: 2009 Nov 23, 11:50 -0800

    George, "flux-gate compass" is a mature technology.  First tried at the fleet 
    level in the first gas-turbined frigates (US Navy) at least 25 years ago.  
    The objective was to get a self-correcting magnetic compass as backup to the 
    gyro-compass, and explore the possibility of removing the then "large 
    footprint" gyro-compass altogether.  Taken over by GPS/inertial with a 
    gyro-compass backup.
    
    Today's minature electronics means you can buy a relatively inexpensive 
    flux-gate compass and wear it like a wrist-watch.  Timex is one brand.  Fun 
    is jogging a box (or ellipse) over a steel pipeline.  All machines have their 
    limitations.
    
    Joe
    
    
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