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    Re: Nav Exercise #4- Amplitude of the Sun
    From: Jeremy C
    Date: 2008 May 26, 00:59 EDT
    Although electronic self-steering systems as found on modern yachts (don't know about big ships) can do just this.  I remember sailing (with other crew) downwind on a largish yacht into a crowded harbour, full of those pesky sailing boats, us under spinnaker, no hand on the helm, making direction changes as tiny variations in wind dictated by pressing the appropriate button on Igor the Autohelm to alter course by one tenth of a degree at a time.  It worked very well, holding that tricky point of sail, we all agreed, much better than any of us could have done manually.
     
     
     
    I should be more clear, I can "set" my autopilot to 1/10th of a degree, but with yaw, it cannot hold this level of accuracy except in dead calm weather.  I agree, our "Iron Mike" can do a better job of steering then most any person, we do not think that we can steer a course with better then 1 degree accuracy any length of time, especially at sea; we just don't have that kind of lateral stability.
     
    Jeremy





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