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    Re: GPS & Magnetic Bearings
    From: Brooke Clarke
    Date: 2003 Feb 9, 17:32 -0800

    Hi Robert:
    
    Yes, every 5 years you can load the new magnetic data.
    No, it requires returning the unit to a franchised dealer who updates the firmware for a charge.
    
    Robert Eno wrote:
    
    > 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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