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    Re: Practical difficulties
    From: Fred Hebard
    Date: 2011 May 13, 13:56 -0400

    For my edification, why do your refer to six degrees of freedom for boat 
    motion rather than three?  I can imagine roll, pitch and yaw.  I guess one 
    could add bobbing up and down.  T
    Thanks for the report; I like sea stories.
    On Fri, May 13, 2011 at 12:46 PM, Patrick Goold  wrote:
    > (4)        The next day the sky was clear all day.  But now we were on a 
    broad reach with a steep and substantial quartering swell.  The boat was 
    moving quickly through all six degrees of freedom.  I am not especially prone 
    to seasickness but this kind of tack is the one most likely to bring it on.  
    Even if I have had a few days to get my sea legs (which I hadn't in this 
    case), when the boat is yawing, swaying and surging in addition to pitching, 
    rolling and heaving, I need to keep one eye on the horizon or go green.  The 
    sextant never left the case.  Even had I taken a full set of sights, reducing 
    and plotting them would have been beyond me.
    > These were not storm conditions.  It was a rather typical spring day on the 
    Chesapeake Bay.  The wind was NE at 15 knots.  The swell was no more than 
    three or four feet but short and steep.  
    > Patrick

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