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    Re: Manual calculation of compass variation
    From: Fred Hebard
    Date: 2004 Oct 16, 10:46 -0400

    On Oct 16, 2004, at 8:28 AM, Richard Langley wrote:
    
    > For those who might be interested in a simple introduction to
    > geomagnetism and
    > its relevance to navigation (including GPS), see "Getting Your
    > Bearings: The
    > Magnetic Compass and GPS"
    > . The
    > intention
    > of the article was to introduce geomagentism and its use in navigation
    > to GPS
    > industry types and was not intended for expert navigators -- such as
    > we have
    > on the list.
    > -- Richard Langley
    >
    
    Richard,
    
    That was a very informative article for this non-expert navigator, not
    to mention a reminder of how much I don't know.
    
    I was surprised that a vessel needs to be going 5-10 km/hr to get a GPS
    track accurate to better than one degree, and am wondering what the
    accuracy of the track is for low speeds, which might easily be
    encountered in a sailing vessel; I suppose this information is included
    in GPS manuals, but I don't have one.
    
    Thanks,
    
    Fred
    
    
    

       
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