Re: [Paddlewise] ded/dead etymology

Almost... the GPS only knows the course, not the heading.
With dead reckoning, you know the heading, but not the course.



On Wed, 29 Sep 2004 12:59:10 -0400, "Steve Cramer"
<cramersec_at_charter.net> said:
> Robert C Cline wrote:
> 
> > No.  If you review again, 
> 
> Assumes prior review not in evidence :)
> 
> > the definition of dead reckoning cited in "The
> > American Practical Navigator," Ho. Pub. No. 9 (Defense Mapping Agency
> > Hydrographic/Topographic Center publication) the "Dead" Reckoning is the
> > advanced position based on course, time and speed, without considering
> > the influence of current, wind and other unknowns.  In common
> > terminology, if you are in "Dead Water" you are in water which is not
> > moving.  Thus, Dead Reckoning is a calculation based on the premise that
> > you are in water which is not moving. 
> 
> Ah, so the "dead" refers to the water, not the reckoning. No current, no 
> wind, no unknowns. Sounds like the frictionless slides located in 
> vacuums in Physics 101.
> 
> So dead reckoning is just geometry and trig, and therefore very precise, 
> since all you need to know is beginning position, course, and speed, 
> which of course you know precisely because....it's part of the readout 
> on your GPS.
> 
> Steve
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