There are too many kinds of miles in current or
past use. Nautical (1852 m), international (1609.344
m), US statute (1609.347 m) miles are now used. They
can cause confusion. For more information on various
miles, visit "A Dictionary of Units of Measurement" �
Russ Rowlett at
http://www.unc.edu/~rowlett/units/dictM.html .
While there are no internationally accepted
symbols of nautical miles and knots, in China, "n
mile" is used as a local symbol of nautical miles, but
it looks like an abbreviation, and "kn" is used as a
symbol of knots as well. Since a knot equals to a
nautical mile per hour (1 kn = 1 n mile/h), I wonder
if it is good enough to call a "knot-hour" (kn h) as a
substitute of a nautical mile. The above link has
stated that the knot has been used in error as the
nautical mile.
=====
Justin JIH
http://www.geocities.com/jusjih/
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