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Yes, this?s true, but I think that Rhumb Line is only the line on the surface 
of the earth, ( spherical or oblate), of a Mercator Sailing, also called 
loxodrome
>Mercator Sailing:
>        Provides a solution to the plot as made on a mercator chart. Uses
>meridonial differences and difference of longitude in place of
>difference of latitude and departure, respectively.
>
>Rhumb Lines:
>        Maintains a true direction. Makes the same angle with all meridians
>it crosses. Maintains a straight line on a mercator chart. The
>difference between the Rhumb line and the Great Circle connecting two
>points increases as (1) as the latitude increases, as the difference in
>latitude between two places decreases, and (3) as the difference of
>longitude increases.
>
Andr?s Ruiz
e-mail: aruiz@XXX.XXX
http://www.geocities.com/CapeCanaveral/Runway/3568/index.html

   

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