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    Re: GPS & Magnetic Bearings
    From: Robert Eno
    Date: 2003 Feb 9, 20:18 -0500

    So are you saying that you GPS has the capability to acquire updated
    magnetic deviation data? Is this done using a computer disk?
    
    Robert
    ----- Original Message -----
    From: Brooke Clarke 
    To: 
    Sent: Sunday, February 09, 2003 6:11 PM
    Subject: Re: GPS & Magnetic Bearings
    
    
    > Hi Robert:
    >
    > You're very close.  The World Magnetic Model is based on empirical
    observation, not a theory.  The model uses a 12th order
    > polynomial based on past observations.  My Motorola GPS uses flash memory
    and can be updated for a fee.  The model is much more
    > complex than just the variation (I misused deviation in the prior post),
    it has magnitudes for all three vectors North-South,
    > East-West and the largest one Up-Down.
    >
    > Have Fun,
    >
    > Brooke
    
    
    

       
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