Re: anachronisms?

On Jan 13, 8:48 pm, Erik Max Francis <m...@[EMAIL PROTECTED]
> wrote:
> bernardZwrote:
> > Why?
>
> > In the days of sailing ****ps to navigate you used dead reckoning. It
was
> > accurate. However it took much work.
>
> Right, because in the open ocean, dead reckoning works really well.
>
> --
> Erik Max Francis && m...@[EMAIL PROTECTED]
 &&http://www.alcyone.com/max/
>   San Jose, CA, USA && 37 18 N 121 57 W && AIM, Y!M erikmaxfrancis
>    Reason should win out on Earth and then in the whole universe.
>     -- Yuri Glazkov


It work well if you know what you are doing and that is how it was
done for centuries. It just takes a lot of work.

What the later medieval and early modern sailors did was every hour
they measured the speed and direction (with a compass) of the ****p.
They then recorded these figures on a board. Every so often these
figures were transfered to a chart by the navigator.

You may find this article interesting.
http://www.newworldexplorersinc.org/EarlyNavigation.pdf