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    Re: Gyro Error.
    From: Geoffrey Kolbe
    Date: 2013 May 22, 06:02 +0100
    Bill B wrote:
    
    Suppose you are sailing at 8 knots in 5 foot seas, and your GPS is
    polling every second (likely faster). Suppose you have a GPS antenna on
    top of the mast. As the boat rolls the GPS is seeing significant lateral
    motion in relation to the forward motion.  I have found this to be
    true
    even with handhelds and chart plotters with internal antennas located in
    the cockpit. Even in swells with the compass steady and a visual object
    dead ahead, plus/minus 3° is the norm. Trying to calibrate compass
    deviation with a GPS is truly a fools game. (This fool discovered that
    experientially ;-)
    

    Well, trying to calibrate a compass using a GPS or any other method in 5 foot seas sailing at 8 knots in a small boat would seem to me a triumph of hope over reasonable expectation....
       
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