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    Re: GPS & Magnetic Bearings
    From: Peter Fogg
    Date: 2003 Feb 10, 08:53 +1100

    Brooke Clarke wrote:
    > ... the magnetic deviation if ...
    > Jared Sherman wrote:
    > ... the GPS ... deviation data ...
    I'm not sure if this is due to different countries using different 
    terminologies but I learned that the compass difference due to the magnetic 
    poles not being aligned with the geographic poles is called compass variation 
    and local effects (like an iron engine block) about the vicinity of the 
    compass is known as compass deviation.
    So: GPS can have no idea of compass deviation (?) but may, we are learning, 
    have various built in systems to correct for compass variation (?). I guess 
    the real bottom line is that GPS may indicate true bearing which is a mighty 
    useful thing to know.

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