NavList:

Heave and surge are the last two.  Heave is bodily motion of the vessel up and down and surge is bodily motion in the direction of travel.

 

Patrick,

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.

Fred

On Fri, May 13, 2011 at 12:46 PM, Patrick Goold <goold@vwc.edu> 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.
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> 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. 
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